Synthesis, characterization, and magnetic properties of two new Co(II) coordination polymers with a carboxylate- and benzimidazolylcontaining ligand

Article abstract of DOI:10.5560/ZNB.2012-0235

The hydrothermal reaction of cobalt(II) nitrate hexahydrate with 5-(benzimidazol-1- ylmethyl)isophthalic acid (H₂L) leads to the formation of a complex [Co(L)] (1). In the presence of 2-(pyridin-2-yl)-1H- benzimidazole (pybim) as an auxiliary ligand, a complex [Co(L)(pybim)] ·H₂O (2) was obtained. The complexes 1 and 2 have been characterized by single-crystal and powder X-ray diffraction, IR spectroscopy, and elemental and thermogravimetric analyses. Complex 1 shows a binodal (3,6)-connected 2D kgd network with (4³)₂ (4 ⁶.6⁶.8³) topology; 2 shows a chain structure, further linked together by hydrogen bonding and π- π interactions to give rise to a 3D supramolecular framework. Complexes 1 and 2 are examples of auxiliary ligand-assisted structural diversity. The frameworks of 1 and 2 display high thermal stability up to 400°C. The magnetic properties of 1 were investigated.

Full text of DOI:10.5560/ZNB.2012-0235

Synthesis, Characterization, and Magnetic Properties of Two New
Co(II) Coordination Polymers with a Carboxylate- and Benzimidazolyl-
containing Ligand
Xiao-Chun Cheng and Hai-Wei Kuai
Faculty of Life Science and Chemical Engineering, Huaiyin Institute of Technology, Huaian
223003, P. R. China
Reprint requests to Dr. Hai-Wei Kuai. Fax: +86-517-83559044. E-mail: hyitshy@126.com
Z. Naturforsch. 2012, 67b, 1255 – 1262 / DOI: 10.5560/ZNB.2012-0235
Received August 22, 2012
The hydrothermal reaction of cobalt(II) nitrate hexahydrate with 5-(benzimidazol-1-
ylmethyl)isophthalic acid (H2L) leads to the formation of a complex [Co(L)] (1). In the presence of
2-(pyridin-2-yl)-1H-benzimidazole (pybim) as an auxiliary ligand, a complex [Co(L)(pybim)]·H2O
(2) was obtained. The complexes 1 and 2 have been characterized by single-crystal and powder
X-ray diffraction, IR spectroscopy, and elemental and thermogravimetric analyses. Complex 1
shows a binodal (3,6)-connected 2D kgd network with (43)2(46.66.83) topology; 2 shows a chain
structure, further linked together by hydrogen bonding and π–π interactions to give rise to a 3D
supramolecular framework. Complexes 1 and 2 are examples of auxiliary ligand-assisted structural
diversity. The frameworks of 1 and 2 display high thermal stability up to 400 ◦C. The magnetic
properties of 1 were investigated.
Key words: Co(II) Complexes, Structural Characterization, Auxiliary Ligand, Magnetic Properties
Introduction
polymers with novel functional properties as a vast do-
main of potentially multifunctional materials [16 – 18].
During the past decades, synthesis and characteriza- Among many influential factors, the intrinsic nature of
tion of metal-organic frameworks (MOFs), involving organic ligands has been proven to play a decisive role
metal ions and bridging ligands, have attracted increas- in the formation of complexes [19 – 21].
ing interest and undergone considerable development
With this background in mind, we have re-
in coordination, materials and supramolecular chem- cently focused our attention on the utilization of the
istry [1 – 5]. Consequently, a large number of MOFs carboxylate- and benzimidazol-1-yl-containing ligand
were prepared [6 – 9], and the exploitation of such 5-(benzimidazol-1-ylmethyl)isophthalic acid (H2L) as
inorganic-organic hybrid materials has gradually be- a building block for the construction of coordina-
come the main aim of crystal engineering for their in- tion polymers with diverse structures. H2L can be
triguing topologies and potential applications in mag- readily synthesized, and its molecular structure has
netism, heterogeneous catalysis, ion-recognition, non- previously been determined by single-crystal X-ray
linear optics, and adsorption [10 – 12]. It is known that diffraction [22, 23]. Due to the existence of two
the functional properties of complexes are closely re- functional groups, the arene-cored ligand H2L ex-
lated with their structures, and thus, it becomes signif- hibits advantages over other N- or O-donor lig-
icant to pursue structural diversity by attempting dif- ands for its peculiar structural characteristics: (1)
ferent experimental conditions though it is still a great because of the relative orientation of two carboxy-
challenge to assemble complexes with target structures late groups and their mutable coordination patterns
because of complicated factors influencing the assem- such as µ1-η1:η0-monodentate, µ1-η1:η1-chelating
bly process, such as solvent, reaction temperature, and and µ2-η1:η1-bridging modes [24, 25], H2L can act
auxiliary ligands etc. [13 – 15]. However, the complex- as a multi-connector in the assembly of complexes
ity of self-assembly may also give access to composite with various structures; (2) the flexible benzimidazol-
© 2012 Verlag der Zeitschrift fu¨r Naturforschung, Tu¨bingen · http://znaturforsch.com
Brought to you by | University of California
Authenticated
Download Date | 6/9/15 5:48 AM

1256
X.-C. Cheng – H.-W. Kuai · Co(II) Coordination Polymers
1-ylmethyl arm in H2L has more spatial freedom
to adopt different orientations by axial rotation
to different angles to satisfy coordinating require-
ments [26 – 28], and furthermore, (3), the steric hin-
drance of the benzimidazol-1-yl group may engen-
der a subtle impact on the formation of complexes.
For this contribution, two cobalt complexes [Co(L)]
(1) and [Co(L)(pybim)]·H2O (2) (pybim = 2-(pyridin-
2-yl)-1H-benzimidazole) were synthesized under hy-
drothermal conditions and characterized by single-
crystal and powder X-ray diffraction, IR spectroscopy,
and elemental and thermogravimetric analyses. In
addition, the magnetic properties of 1 were also
investigated.
Results and Discussion
Preparation
The hydrothermal reaction of Co(NO3)2·6H2O with
H2L at 180 ◦C in the presence of KOH yielded the
complex [Co(L)] (1); when pybim was introduced into
the hydrothermal reaction system as auxiliary ligand,
the complex [Co(L)(pybim)]·H2O (2) was obtained
(Scheme 1). Complexes 1 and 2 are stable in air.
Structural description of [Co(L)] (1)
Structural analysis shows that complex 1 crystal-
lizes in the monoclinic system with space group P21/c
exhibiting a 2D network structure (Table 1). The H2L
ligand was deprotonated by KOH to the L2− anion.
This can also be confirmed in the IR spectrum by
the absence of a characteristic vibration band for -OH
near 3400 cm−1 for anhydrous 1, and the presence
of characteristic vibration bands of carboxylates at
1621 cm−1 for asymmetric stretches and at 1453 cm−1
for symmetric stretches (see Experimental Section).
The asymmetrical unit contains one Co(II) ion and one
L2− ligand. Each Co(II) center is four-coordinated by
Fig. 1. (a) The coordination environment of the Co atom in
1 with 30% displacement ellipsoids. Hydrogen atoms were
omitted for clarity; (b) view of 2D network structure of 1; (c)
schematic representation of the binodal (3,6)-connected 2D
network of 1.
Scheme 1. Simplified representation of the synthesis and structures of 1 and 2.
Brought to you by | University of California
Authenticated
Download Date | 6/9/15 5:48 AM

X.-C. Cheng – H.-W. Kuai · Co(II) Coordination Polymers
1257
Table 1. Crystal structure data for 1
and 2.
1
2
Formula
Mr
Crystal size, mm3
Crystal system
Space group
C16H10CoN2O4
353.19
0.20 × 0.20 × 0.20
monoclinic
P21/c
C28H21CoN5O5
566.43
0.20 × 0.10 × 0.10
triclinic
¯
P1
˚
a, A
8.3072(10)
11.3306(13)
16.9473(16)
90.0
119.352(4)
90.0
1390.4(3)
4
1.69
9.9364(7)
10.2290(7)
13.7624(9)
77.8000(10)
81.6940(10)
64.0920(10)
1227.64(14)
2
˚
b, A
˚
c, A
α, deg
β, deg
γ, deg
3
˚
V, A
Z
Dcalcd, g cm−3
µ(MoKα ), cm−1
F(000), e
1.53
0.8
582
1.3
716
hkl range
θ range, deg
Refl. measured / unique / Rint
Param. refined
R(F)a / wR(F2)b (all refls.)
GoF (F2)c
±10, ±14, −22 → +9 −12 → 13, −13 → +11, ±18
2.27 – 28.00
8508 / 3290 / 0.0311
208
1.52 – 28.39
8863 / 6052 / 0.0127
350
0.0391 / 0.0871
1.059
0.0459 / 0.1104
1.060
−3
˚
∆ρfin (max / min), e A
0.37 / −0.42
0.91 / −0.42
a
b
R(F) = Σ||Fo| − |F ||/Σ|Fo|; wR(F2) = [Σw(Fo2 − F2)2/Σw(Fo2)2]1/2, w = [σ2(Fo2)+
c
c
(AP)2 + BP]−1, where P = (Max(Fo2,0) + 2F2)/3;
GoF = [Σw(Fo2 − F2)2/(nobs
−
c
c
c
nparam)]1/2
.
˚
Table 2. Selected bond lengths (A) and
[Co(L)] (1)
Co(1)–O(1)
Co(1)–N(12)#2
O(1)–Co(1)–O(4)#1
O(1)–Co(1)–O(3)#3
O(3)#3–Co(1)–O(4)#1
[Co(L)(pybim)]·H2O (2)
Co(1)–N(3)
angles (deg) for complexes 1 and 2a.
2.0386(15)
2.0307(17)
125.61(6)
101.19(6)
106.55(6)
Co(1)–O(4)#1
Co(1)–O(3)#3
O(1)–Co(1)–N(12)#2
O(4)#1–Co(1)–N(12)#2
O(3)#3–Co(1)–N(12)#2
2.0056(14)
1.9989(14)
112.00(7)
111.60(7)
94.00(6)
2.1579(17)
2.1119(16)
2.2778(17)
77.49(6)
87.41(7)
93.10(7)
117.29(7)
153.04(7)
92.62(6)
145.63(6)
58.64(6)
Co(1)–N(4)
Co(1)–O(3)#1
Co(1)–O(2)#2
N(3)–Co(1)–N(11)
O(1)#2–Co(1)–N(3)
N(4)–Co(1)–N(11)
O(1)#2–Co(1)–N(4)
O(3)#1–Co(1)–N(11)
O(2)#2–Co(1)–N(11)
O(2)#2–Co(1)–O(3)#1
2.0954(15)
2.0266(15)
2.1561(15)
169.14(6)
94.05(7)
93.26(6)
96.43(6)
91.92(7)
97.69(6)
Co(1)–N(11)
Co(1)–O(1)#2
N(3)–Co(1)–N(4)
O(3)#1–Co(1)–N(3)
O(2)#2–Co(1)–N(3)
O(3)#1–Co(1)–N(4)
O(2)#2–Co(1)–N(4)
O(1)#2–Co(1)–N(11)
O(1)#2–Co(1)–O(3)#1
O(1)#2–Co(1)–O(2)#2
86.99(6)
a
Symmetry transformations used to generate equivalent atoms: for 1: #1 1 − x, 1/2 + y,
3/2−z; #2 −x, 1−y, 1−z; #3 −1+x, 3/2−y, −1/2+z; for 2: #1 1+x, −1+y, z; #2 1−x,
1−y, 1−z.
one benzimidazolyl nitrogen atom and three carboxy- nating bond angles are in the range from 94.00(6) to
late oxygen atoms from three different L2− ligands 125.61(6)◦ (Table 2). One of the carboxylate groups in
to furnish a distorted tetrahedral coordination geom- the L2− ligand adopts µ1-η1:η0−monodentate coordi-
etry [CoNO3] (Fig. 1a). The coordinative bond lengths nation mode, the other is in a µ2-η1:η1-bridging coor-
˚
vary from 1.9989(14) to 2.0386(15) A, and the coordi- dination mode [Scheme 2(A)], resulting in the forma-
Brought to you by | University of California
Authenticated
Download Date | 6/9/15 5:48 AM

1258
X.-C. Cheng – H.-W. Kuai · Co(II) Coordination Polymers
clear units. In complex 1, each L2− ligand bridges
three SBUs; each SBU is surrounded by six L2− lig-
ands. This kind of connection repeats infinitely to
form 2D network structure (Fig. 1b). Topology can
be used to further analyze the structure of 1, each
SBU being regarded as a 6-connector node and each
L2− ligand as a 3-connector node. Thus, the resultant
structure of 1 could be simplified as a binodal (3,6)-
connected 2D kgd network with (43)2(46.66.83) topol-
ogy (Fig. 1c) [29].
Scheme 2. The coordination modes of the L2− and the pybim
ligands appearing in the complexes.
Structural description of [Co(L)(pybim)]·H2O (2)
tion of carboxylate-bridged binuclear secondary build-
ing unit (SBU) [Co2(COO)2] with a Co···Co distance
The complex [Co(L)(pybim)]·H2O (2) crystallizes
¯
˚
of 3.80 A (Fig. 1a), which is shorter than the sum in the triclinic crystal system with space group P1 and
˚
of two van der Waals radii (3.84 A). This indicates is composed of neutral chains and water molecules.
that there may be Co···Co contacts within the binu- The asymmetric unit consists of one Co(II) cation,
Fig. 2. (a) The coordination
environment of the Co atom in
2 with 30% displacement el-
lipsoids. Hydrogen atoms and
the water molecule were omit-
ted for clarity; (b) view of
the 1D structure of 2; (c) the
2D network of 2 extended
by hydrogen bonds; (d) the
extended 3D supramolecular
framework of 2.
Brought to you by | University of California
Authenticated
Download Date | 6/9/15 5:48 AM

X.-C. Cheng – H.-W. Kuai · Co(II) Coordination Polymers
1259
one L2− anion, one pybim molecule, and one disor-
dered water molecule. The coordination environment
around the Co atom is shown in Fig. 2a together with
the atom numbering scheme. The Co atom is hexa-
coordinated with distorted octahedral coordination ge-
ometry by three carboxylate O atoms from two dif-
ferent L2− ligands, one benzimidazolyl N atom, and
two N atoms from a pybim molecule [Scheme 2(B)
and (C)]. The equatorial plane is occupied by three
carboxylate O atoms with an average Co–O bond
˚
length of 2.154 A and one pybim N atom; the two ax-
ial positions are held by benzimidazolyl and pybim
N atoms with Co–N bond lengths of 2.1119(16) and
2.1579(17) A; the coordinative bond angles at Co vary
Fig. 3. The PXRD patterns of complexes 1 and 2.
˚
from 58.64(6) to 169.14(6)◦. In complex 2, one car-
boxylate group of the L2− ligand exhibits a µ1-η1:η0-
monodentate coordination mode, while the other is µ1-
η1:η1-chelating with the angle subtended at cobalt
being 58.64(6)◦; each benzimidazolyl group coordi-
nates to a metal center, and thus the whole L2− ligand
adopts a µ3-η1:η0-η1:η1-η1 mode as a 3-connector
bridge; each metal center is coordinated by three differ-
ent L2− ligands. The interconnection of metal and lig-
and extends infinitely to form a neutral chain structure
(Fig. 2b). Apart from the coordinative bonds, hydro-
gen bonding and π–π stacking interactions are present
in 2, which undoubtedly play an important role in
constructing and stabilizing the resulting solid-state
structure. According to their function in constructing
Fig. 4. TGA curves of complexes 1 and 2.
a supramolecular structure, we divide the weak inter- shown in Fig. 4. No obvious weight loss can be ob-
actions into two groups: (1) N(5)–H(19)···O(4)#1 [#1: served before the decomposition of the framework at
1−x, 1−y, 2−z; N(5)···O(4)#1 = 2.746(2) A; ∠N(5)– 530 ◦C for 1, which further confirms that no solvent is
˚
H(19)···O(4)#1 = 164◦], the hydrogen bonding inter- trapped in its structure. For complex 2, there is a weight
actions between H atoms in pybim molecules and car- loss of 2.90% from 85 ◦C to 150 ◦C corresponding to
boxylate O atoms from adjacent chains, which further the release of water (calcd. 3.18%), preceding the sub-
link these chains to form a 2D network (Fig. 2c); (2) sequent decomposition of the framework at 400 ◦C.
π–π stacking interactions with a centroid-centroid dis-
˚
tance between the central benzene rings of 3.979 A, Magnetic properties of complex 1
through which adjacent 2D networks are superposed
to yield a 3D supramolecular framework (Fig. 2d).
The Co atoms are bridged by carboxylate groups
to form a dinuclear unit [Co2(COO)2] in 1, which
may mediate magnetic interactions [30]. The temper-
ature dependence of the magnetic susceptibility of 1
was investigated from 300 to 1.8 K with an applied
magnetic field of 2000 Oe. The χM, χ−1, and χMT
vs. T curves for 1 are shown in Fig. 5. MThe tempera-
ture dependence of χM−1 above 50 K obeys the Curie-
PXRD and thermal stability of complexes 1 and 2
The phase purities of 1 and 2 could be proven by
powder X-ray diffraction (PXRD). As shown in Fig. 3,
each PXRD pattern of the as-synthesized sample is
consistent with the simulated one.
Thermogravimetric analyses (TGA) were carried Weiss equation of χ−M1 = (T − θ)/C with the Curie-
out for complexes 1 and 2, and the results of TGA are Weiss constants C = 3.36 cm3 mol−1 K, θ = –40.45 K.
Brought to you by | University of California
Authenticated
Download Date | 6/9/15 5:48 AM

1260
X.-C. Cheng – H.-W. Kuai · Co(II) Coordination Polymers
Experimental Section
All commercially available chemicals were reagent grade
and used as received without further purification. The H2L
ligand was synthesized via a similar experimental procedure
as reported in the literature (Scheme 3) [22]. Elemental anal-
ysis of C, H, and N were taken on a Perkin-Elmer 240C
elemental analyzer. Infrared spectra (IR) were recorded on
a Bruker Vector22 FT-IR spectrophotometer by using KBr
pellets. Thermogravimetric analysis (TGA) was performed
on a simultaneous SDT 2960 thermal analyzer under nitro-
gen atmosphere with a heating rate of 10 ◦C min−1. Pow-
der X-ray diffraction (PXRD) patterns were measured on
a Shimadzu XRD-6000 X-ray diffractometer with CuKα
Fig. 5. Temperature dependences of the magnetic susceptibil-
ity of χM, χ−1 and χMT for 1. The solid line represents the
fitted curve. M
˚
(λ = 1.5418 A) radiation at room temperature. The magnetic
measurement in the temperature range of 1.8 to 300 K was
carried out on a Quantum Design MPMS7 SQUID magne-
tometer in a field of 2 kOe (1 kOe = 7.96 × 104 A m−1).
The negative value of θ and the shape of the χMT vs. T
curve suggest antiferromagnetic interactions between
the neighboring Co(II) centers [31 – 33]. In order to es-
timate the strength of the magnetic interactions in 1,
the following equation was used [34, 35]:
Preparation of [Co(L)] (1)
The reaction mixture of Co(NO3)2·6H2O (29.1 mg,
0.1 mmol), H2L (29.6 mg, 0.1 mmol) and KOH (11.2 mg,
0.2 mmol) in 12 mL H2O was sealed in a 16 mL Teflon-lined
stainless-steel container and heated at 180 ◦C for 48 h. After
cooling to r. t., red block-shaped crystals of 1 were collected
by filtration and washed with water and ethanol several times
to give a yield of 52% based on H2L. – C16H10N2O4Co
(353.19): calcd. C 54.41, H 2.85, N 7.93; found C 54.66,
H 2.98, N 8.16. – IR (KBr pellet, cm−1): ν = 1621 (s), 1565
(s), 1509 (s), 1453 (s), 1377 (s), 1241 (w), 1185 (w), 1104
(w), 967 (w), 917 (w), 806 (w), 775 (w), 760 (s), 740 (s), 725
(s), 674 (w), 649 (w), 593 (w), 532 (w).
χMT = Ae(−E1/kT) +Be(−E2/kT)
(1)
Here, A+B approximately equals the Curie constant
(C), and E1, E2 represent the ‘activation energies’ cor-
responding to the spin-orbit coupling and the magnetic
exchange interaction, respectively. The obtained val-
ues of A + B = 3.39 cm3 mol−1 K and E1/k = 48.96 K
agree with those given in a previous report [34, 35].
The value of −E2/k = −1.39 K, corresponding to
J = −2.78 K, further proves that antiferromagnetic
interaction exists between neighboring Co atoms in
1 [36, 37].
Preparation of [Co(L)(pybim)]·H2O (2)
Complex 2 was obtained by an analogous hydrothermal
procedure as that used for the preparation of 1 except that
pybim (19.5 mg, 0.1 mmol) was used as an auxiliary ligand.
After cooling to room temperature, red block-shaped crystals
of 2 were collected by filtration and washed with water and
ethanol several times to give a yield of 56% based on H2L. –
Conclusion
The ligand 5-(benzimidazol-1-ylmethyl)isophthalic
acid (H2L) reacts with cobalt nitrate hexahydrate under
hydrothermal conditions to yield the complex [Co(L)]
(1). In the presence of the auxiliary ligand pybim, the C28H21N5O5Co (566.43): calcd. C 59.37, H 3.74, N 12.36;
complex [Co(L)(pybim)]·H2O (2) is formed. Complex
1 is a binodal (3,6)-connected 2D kgd network with
(43)2(46.66.83) topology; 2 shows a chain structure,
further linked by hydrogen bonding and π–π interac-
tions to form a 3D supramolecular framework. Struc-
tural diversity is thus achieved by the presence of an
auxiliary ligand. The frameworks of 1 and 2 exhibit
high thermal stability up to 400 ◦C. Investigation of
magnetic properties shows antiferromagnetic interac-
tions between neighboring Co atoms in 1.
Scheme 3. Schematic representation of the synthetic route of
the H2L ligand.
Brought to you by | University of California
Authenticated
Download Date | 6/9/15 5:48 AM

X.-C. Cheng – H.-W. Kuai · Co(II) Coordination Polymers
1261
found C 59.62, H 3.96, N 12.13. – IR (KBr pellet, cm−1): atoms were refined anisotropically on F2 by full-matrix
ν = 3437 (m), 1611 (s), 1571 (s), 1544 (s), 1504 (m), 1477 least-squares techniques using the SHELXS/L-97 crystallo-
(m), 1459 (s), 1441 (s), 1384 (s), 1321 (m), 1299 (m), 1183 graphic software package [40, 41]. In 1 and 2, all hydrogen
(w), 978 (m), 750 (s), 715 (s).
atoms at C atoms were generated geometrically; the hydro-
gen atoms of the water molecule in 2 could not be located
and thus were excluded from the refinement, while the H19
X-Ray structure determinations
The crystallographic data collections for complexes 1 and at N5 in 2 could be found at a reasonable position in the dif-
2 were carried out on a Bruker Smart Apex CCD area- ference Fourier maps. The details of crystal parameters, data
detector diffractometer using graphite-monochromatized collection, and refinements for the complexes are summa-
˚
MoKα radiation (λ = 0.71073 A) at 293(2) K. The diffrac- rized in Table 1. Selected bond lengths and angles are listed
tion data were integrated by using the program SAINT [38], in Table 2.
which was also used for the intensity corrections for Lorentz
CCDC 896724 and 896725 contain the supplementary
and polarization effects. Semi-empirical absorption correc- crystallographic data for this paper. These data can be ob-
tions were applied using SADABS [39]. The structures of 1 tained free of charge from The Cambridge Crystallographic
and 2 were solved by Direct Methods, and all non-hydrogen Data Centre via www.ccdc.cam.ac.uk/data request/cif.
[1] G. C. Xu, Q. Hua, T. Okamura, Z. S. Bai, Y. J. Ding, [17] Z. Su, J. Fan, T. Okamura, W. Y. Sun, N. Ueyama,
Y. Q. Huang, G. X. Liu, W. Y. Sun, N. Ueyama, Cryst
EngComm 2010, 11, 261 – 270.
[2] T. Uemura, Y. Ono, Y. Hijikata, S. Kitagawa, J. Am.
Chem. Soc. 2010, 132, 4917 – 4924.
Cryst. Growth Des. 2010, 10, 3515 – 3521.
[18] W. W. Zhou, J. T. Chen, G. Xu, M. S. Wang, J. P. Zou,
X. F. Long, G. J. Wang, G. C. Guo, J. S. Huang, Chem.
Commun. 2008, 2762 – 2764.
[3] C. Y. Chen, J. Peng, Y. Shen, D. Chen, H. Q. Zhang, [19] G. Z. Liu, S. H. Li, L. Y. Wang, CrystEngComm 2012,
C. L. Meng, Z. Naturforsch. 2011, 66b, 43 – 48. 14, 880 – 889.
[4] G. C. Liu, J. X. Zhang, X. L. Wang, H. Y. Lin, A. X. [20] G. X. Liu, Y. Q. Huang, Q. Chu, T. A. Okamura, W. Y.
Tian, Y. F. Wang, Z. Naturforsch. 2011, 66b, 125 –
132.
Sun, H. Liang, N. Ueyama, Cryst. Growth Des. 2008,
8, 3233 – 3245.
[5] L. F. Ma, X. Q. Li, L. Y. Wang, H. W. Hou, CrystEng- [21] R. Cao, D. Sun, Y. Liang, M. Hong, K. Tatsumi, Q. Shi,
Comm 2011, 13, 4625 – 4634. Inorg. Chem. 2002, 41, 2087 – 2094.
[6] Y. Kobayashi, B. Jacobs, M. D. Allendorf, J. R. Long, [22] J. Fan, B. E. Hanson, Inorg. Chem. 2005, 44, 6998 –
Chem. Mater. 2010, 22, 4120 – 4122. 7008.
[7] M. S. Chen, Z. Su, M. Chen, S. S. Chen, Y. Z. Li, [23] X. C. Cheng, Acta Crystallogr. 2011, E67, o3299.
W. Y. Sun, CrystEngComm 2010, 2, 3267 – 3276.
[8] J. F. Kou, M. Su, Y. H. Zhang, Z. D. Huang, S. W. Ng,
G. Yang, Z. Naturforsch. 2010, 65b, 1467 – 1471.
[24] Z. F. Tian, J. G. Lin, Y. Su, L. L. Wen, Y. M. Liu,
H. Z. Zhu, Q. J. Meng, Cryst. Growth Des. 2007, 7,
1863 – 1867.
[9] C. Kallfaß, C. Hoch, H. Schier, A. Simon, H. Schubert, [25] Q. Hua, Y. Zhao, G. C. Xu, M. S. Chen, Z. Su, K. Cai,
Z. Naturforsch. 2010, 65b, 1427 – 1433. W. Y. Sun, Cryst. Growth Des. 2010, 10, 2553 – 2562.
[10] J. R. Li, R. J. Kuppler, H. C. Zhou, Chem. Soc. Rev. [26] H. W. Kuai, X. C. Cheng, X. H. Zhu, J. Coord. Chem.
2009, 38, 1477 – 1504. 2011, 64, 1636 – 1644.
[11] B. L. Chen, S. C. Xiang, G. D. Qian, Acc. Chem. Res. [27] H. W. Kuai, X. C. Cheng, X. H. Zhu, J. Coord. Chem.
2010, 43, 1115 – 1124. 2011, 64, 3323 – 3332.
[12] B. H. Ye, M. L. Tong, X. M. Chen, Coord. Chem. Rev. [28] H. W. Kuai, X. C. Cheng, L. D. Feng, X. H. Zhu, Z.
2005, 249, 545 – 565. Anorg. Allg. Chem. 2011, 637, 1560 – 1565.
[13] S. Mishra, E. Jeanneau, H. Chermette, S. Daniele, [29] V. A. Blatov, A Multipurpose Crystallochemical Anal-
L. G. Hubert-Pfalzgraf, Dalton Trans. 2008, 620 – 630.
[14] Z. He, C. He, E. Q. Gao, Z. M. Wang, X. F. Yang,
C. S. Liao, C. H. Yan, Inorg. Chem. 2003, 42, 2206 –
2208.
[15] B. Zhao, L. Yi, Y. Dai, X. Y. Chen, P. Cheng, D. Z.
Liao, S. P. Yan, Z. H. Jiang, Inorg. Chem. 2005, 44,
911 – 920.
ysis with the Program Package TOPOS, Samara State
University, Samara (Russia) 2009; See also: V. A. Bla-
tov, IUCr CompComm Newsletter 2006, 7, 4 – 38.
[30] D. Ghoshal, G. Mostafa, T. K. Maji, E. Zangrando,
T. H. Lu, J. Ribas, N. R. Chaudhuri, New J. Chem.
2004, 28, 1204 – 1213.
[31] J. W. Raebiger, J. L. Manson, R. D. Sommer, U. Geiser,
A. L. Rheingold, J. S. Miller, Inorg. Chem. 2001, 40,
2578 – 2581.
[16] L. F. Ma, L. Y. Wang, D. H. Lu, S. R. Batten, J. G.
Wang, Cryst. Growth Des. 2009, 9, 1741 – 1749.
Brought to you by | University of California
Authenticated
Download Date | 6/9/15 5:48 AM

1262
X.-C. Cheng – H.-W. Kuai · Co(II) Coordination Polymers
[32] J. M. Herrera, A. Bleuzen, Y. Dromze´e, M. Julve, [37] O. Kahn, Molecular Magnetism, VCH, Weinheim,
F. Lloret, M. Verdaguer, Inorg. Chem. 2003, 42, 7052 –
7059.
[33] Z. Su, Z. S. Bai, J. Xu, T. Okamura, G. X. Liu, Q. Chu,
X. F. Wang, W. Y. Sun, N. Ueyamab, CrystEngComm
2009, 11, 873 – 880.
1993.
[38] SAINT, Program for Data Extraction and Reduction,
Bruker Analytical X-ray Instruments Inc., Madison,
Wisconsin (USA) 2001.
[39] G. M. Sheldrick, SADABS, Program for Empirical Ab-
sorption Correction of Area Detector Data, University
of Go¨ttingen, Go¨ttingen (Germany) 1997.
[34] J. M. Rueff, N. Masciocchi, P. Rabu, A. Sironi, A. Sko-
ulios, Chem. Eur. J. 2002, 8, 1813 – 1820.
[35] J. M. Rueff, N. Masciocchi, P. Rabu, A. Sironi, A. Sko- [40] G. M. Sheldrick, SHELXS/L-97, Programs for Crys-
ulios, Eur. J. Inorg. Chem. 2001, 2843 – 2848.
[36] R. L. Carlin, Magnetochemistry, Springer, Berlin,
Heidelberg, 1986.
tal Structure Determination, University of Go¨ttingen,
Go¨ttingen (Germany) 1997.
[41] G. M. Sheldrick, Acta Crystallogr. 2008, A64, 112 –
122.
Brought to you by | University of California
Authenticated
Download Date | 6/9/15 5:48 AM