A dinuclear nickel(II) complex derived from an asymmetric Salamo-type N2O2 chelate ligand: Synthesis, structure and optical properties

Article abstract of DOI:10.1515/znb-2016-0268

A new dinuclear Ni(II) complex, [{Ni(L) (C₅H₅N)}₂], has been synthesized with 4-chloro-4′,6′- dibromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)] diphenol (H₂L), and characterized by elemental analyses, FT-IR, UV/Vis, molar conductance and X-ray crystallographic analysis. Each Ni(II) atom is located at a N₂O₂ coordination site of a completely deprotonated (L)₂- unit. Two μ-phenoxo oxygen atoms from two [Ni(L)] units and two pyridine nitrogen atoms coordinate with two Ni(II) atoms. The two hexa-coordinated Ni(II) atoms have slightly distorted octahedral geometries. The μ-phenoxo bridges play important roles in assembling Ni²⁺ and (L)^2- units. This 2:2 (Ni²⁺:(L)^2-) structure is different from that of other Salamotype Ni(II) complexes reported earlier.

Full text of DOI:10.1515/znb-2016-0268

Z. Naturforsch. 2017; 72(6)b: 415–420
Xiu-Yan Dong, Quan-Peng Kang, Bo-Xian Jin and Wen-Kui Dong*
A dinuclear nickel(II) complex derived from an
asymmetric Salamo-type N O chelate ligand:
2
2
synthesis, structure and optical properties
DOI 10.1515/znb-2016-0268
functional groups or substitution of some parts, should
Received December 14, 2016; accepted February 15, 2017
be effective. In particular, replacement of some atoms of
the ligand with other elements often drastically changes
its properties [20–23]. Where an O-alkyl oxime moiety
Abstract: A new dinuclear Ni(II) complex, [{Ni(L)
(
C H N)} ], has been synthesized with 4-chloro-4′,6′-
5 5 2
(
–CH=N–O–(CH ) –O–N=CH–) is used instead of the imine
2 n
dibromo-2,2′-[ethylenedioxybis(nitrilomethylidyne)]
moiety, the larger electronegativity of the oxygen atoms is
expected to affect strongly the electronic properties of the
N O coordination sphere, and to lead to new properties and
diphenol (H L), and characterized by elemental analyses,
2
FT-IR, UV/Vis, molar conductance and X-ray crystallo-
graphic analysis. Each Ni(II) atom is located at a N O coor-
2
2
2
2
structures of the resulting complexes [24–29]. The struc-
tures of Salamo-type Ni(II) complexes reported are mono-
2−
dination site of a completely deprotonated (L) unit. Two
μ-phenoxo oxygen atoms from two [Ni(L)] units and two
pyridine nitrogen atoms coordinate with two Ni(II) atoms.
The two hexa-coordinated Ni(II) atoms have slightly dis-
torted octahedral geometries. The μ-phenoxo bridges play
[
30, 31], tri- [26, 31, 32] and hepta-nuclear [33]. Surprisingly,
to the best of our knowledge, no other structures of multi-
nuclear Ni(II) complexes have yet been reported.
Herein, following our previous studies on transition
metal Salamo-type complexes [34], we report the synthe-
sis, characterization, supramolecular structure and optical
properties of a new dinuclear Ni(II) complex with an asym-
2+
2−
important roles in assembling Ni and (L) units. This 2:2
2
+
2−
(
Ni :(L) ) structure is different from that of other Salamo-
type Ni(II) complexes reported earlier.
Keywords: asymmetric Salamo-type ligand; crystal struc- metric Salamo-type N O bisoxime chelate ligand (H L).
2
2
2
ture; Ni(II) complex; optical properties; synthesis.
2
Experimental section
1
Introduction
2
.1 Materials
Transition metal complexes bearing salen-type ligands
R–CH=N–(CH) –N=CH–R) [1–4] have been extensively
(
2
3
,5-Dibromo-2-hydroxybenzaldehyde
-hydroxy-5-chlorobenzaldehyde (>99%) were purchased
from Alfa Aesar and used without further purification.
,2-Bis(aminooxy)ethane was synthesized according to
(>99%)
and
investigated as catalysts [5–8], models of reaction centers
of metalloenzymes [9, 10], nonlinear optical materials [11,
2
1
2], magnetic materials [13–16] and biological models for
1
understanding the structures of biomolecules and biologi-
cal processes [17–19]. Although some progress has been
made in the studies of salen–Ni(II) complexes, it still seems
that there could be new and specific applications for such
a unique group of compounds. To change the structures or
improve the functions of the resulting complexes, chemi-
cal modifications of the ligand, e.g. introduction of some
an analogous method reported earlier [20]. The other rea-
gents and solvents were analytical grade reagents from
Beijing Chemical Reagent Factory, and were used without
further purification.
2
.2 Methods
Elemental analysis for Ni was carried out with an IRIS
ER/Sꢀ·ꢀWP-1 ICP atomic emission spectrometer, and C, H
and N analyses were carried out with a GmbH VarioEL
V3.00 automatic elemental analyzer. FT-IR spectra were
recorded on a VERTEX70 FT-IR spectrophotometer,
*
Corresponding author: Wen-Kui Dong, School of Chemical and
Biological Engineering, Lanzhou Jiaotong University, Lanzhou,
Gansu 730070, P.R. China, e-mail: dongwk@126.com
Xiu-Yan Dong, Quan-Peng Kang and Bo-Xian Jin: School of Chemical
and Biological Engineering, Lanzhou Jiaotong University, Lanzhou,
Gansu 730070, P.R. China
−1
with samples prepared as KBr (500–4000 cm ) and CsI
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16ꢀꢁꢁꢁꢂꢀX.-Y. Dong et al.: Synthesis of a dinuclear nickel(II) complex
Scheme 1:ꢁThe synthetic route to H L.
2
−
1
(
100–500 cm ) pellets. UV/Vis absorption spectra were 2.5 X-ray crystallography of the Ni(II)
recorded on a Shimadzu UV-2550 spectrometer. Molar
conductance measurement was carried out on a model
complex
DDS-11D-type conductivity bridge using 1.0ꢀ×ꢀ10−3 mol L−3 A single crystal of the Ni(II) complex with approximate
3
solution in DMF at 25°C. Thermogravimetry-differential dimensions of 0.24ꢀ×ꢀ0.32ꢀ×ꢀ0.39 mm was placed on a
thermal analysis (TG-DTA) were carried out at a heating Bruker Smart diffractometer equipped with an Apex CCD
−1
rate of 5°C min on a ZRY-1P thermoanalyzer. X-ray single area detector. The diffraction data were collected using
crystal structure analysis was carried out on a Rapid Auto graphite-monochromatized MoK radiation (λꢀ=ꢀ0.71073 Å)
α
Version 3.0 Rigaku RAXIS-RAPID instrument. Melting at 298(2) K. The structure was solved by using the program
points were measured by the use of a microscopic melting Sꢁꢂꢃꢄꢅ-97 and difference Fourier techniques, and refined
2
point apparatus from Beijing Taike Instrument Limited by full-matrix least squares on F using Sꢁꢂꢃꢄꢃ-97. All
Company, and are uncorrected.
hydrogen atoms were added theoretically. The crystal and
experimental data are shown in Table 1.
CCDC 1519393 contains the supplementary crystallo-
graphic data for this paper. These data can be obtained
free of charge from The Cambridge Crystallographic Data
Centre via www.ccdc.cam.ac.uk/data_request/cif.
2
.3 Synthesis and characterization
of the ligand H L
2
The synthetic route to the ligand H L is shown in Scheme 1.
2
H L was synthesized according to an analogous
2
method reported earlier [26]. Yield: 81%. m.p. 128–129°C.
3
Elemental analysis for C H Br ClN O (492.55): calcd.
16 13 2 2 4
Results and discussion
–
C 39.02, H 2.66, N 5.69; found C 39.28, H 2.42, N 5.43.
3.1 Molar conductance of the Ni(II) complex
2
.4 Synthesis of the Ni(II) complex
The Ni(II) complex is soluble in DMF and DMSO, but not
soluble in ethanol, methanol, THF, acetone and acetoni-
trile. The free ligand is soluble in all of the aforemen-
tioned solvents. The molar conductance value of the
A solution of Ni(OAc) ꢀ·ꢀ4H O (4.99 mg, 0.02 mmol) in
2
2
ethanol (2 mL) was added dropwise to a solution of H2L
9.87 mg, 0.02 mmol) in methanol (2 mL) at room tempera-
ture. The color of the mixture turned green immediately;
mL of acetone and two drops of pyridine were added.
(
−3
−3
Ni(II) complex at 25°C in 1.0ꢀ×ꢀ10 mol L DMF solution is
1
2
−1
5
.7 Ω− cm mol . Comparing with the molar conduct-
2
ance in different types of electrolytes in organic solvents
reported by W. J. Geary, we can conclude that the Ni(II)
complex is a non-electrolyte [35].
The solution was then stirred for 1 h at room tempera-
ture, placed in an oven and heated for 16 h at 60°C. The
solution was kept still to clarify, and the supernatant
was placed in an oven at 70°C for 3 days. The vessel was
placed in an about 70°C water bath bottle stoppered with
a cork and kept relatively sealed for about 1 week to obtain 3.2 IR spectra of H L and its Ni(II) complex
2
green block-like single crystals suitable for X-ray crystal-
lographic analysis. Yield: 46%. The complex does not The free ligand H L exhibits Ar–O and C=N stretching
2
−1
melt but decomposes at elevated temperatures. For details bands at 1265 and 1610 cm , which are shifted to lower
−1
see below. – Elemental analysis for C H Br Cl Ni N O
frequencies by about 4 and 9 cm for the Ni(II) complex
42
32
4
2
2
6
8
(
1256.65): calcd. C 40.14, H 2.57, N 6.69, Ni 9.34; found C upon complexation. This effect results from the Ni–O
4
0.11, H 2.58, N 6.70, Ni 9.36.
and Ni–N interactions upon complexation similar to that
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X.-Y. Dong et al.: Synthesis of a dinuclear nickel(II) complexꢀꢂꢁꢁꢁꢀ417
Table 1:ꢁCrystal data and numbers pertinent to data collection and
structure refinement of the Ni(II) complex [{Ni(L)(C H N)} ].
5
5
2
Empirical formula
Formula weight
Temperature, K
Wavelength, Å
Crystal size, mmꢅ
Crystal system
Space group
Unit cell dimensions
a, Å
C H Br Cl Ni N O
ꢃꢄ ꢅꢄ ꢃ ꢄ ꢄ ꢆ ꢇ
ꢈꢄꢉꢆ.ꢆꢄ
ꢄ9ꢅ(ꢄ)
ꢊ.ꢋꢈꢊꢋꢅ
ꢊ.ꢄꢃꢂ×ꢂꢊ.ꢅꢄꢂ×ꢂꢊ.ꢅ9
Orthorhombic
Pbca
ꢈꢃ.ꢉꢋ9ꢄ(ꢅ)
ꢈꢆ.9ꢅꢋꢋ(ꢃ)
ꢈꢇ.ꢊꢄꢋꢋ(ꢃ)
ꢃꢃꢉꢈ.ꢋꢅ(ꢈꢋ)
ꢃ
ꢈ.ꢇ
ꢆ.9
ꢄꢃꢇꢊ.ꢊ
ꢉ.ꢄ–ꢋꢊ.ꢆ
−ꢈꢅꢂ≤ꢂhꢂ≤ꢂꢈꢋ
b, Å
c, Å
Volume, Åꢅ
Z
−
ꢅ
Dcalcd, g cm
−
ꢈ
Fig. 1:ꢁUV/Vis absorption spectra of H L and its Ni(II) complex in
μ, mm
2
DMF (5ꢂ×ꢂ10−5 mol L ).
−1
F(ꢊꢊꢊ), e
θ Range, deg
Index ranges hkl
−
−
ꢈꢆꢂ≤ꢂkꢂ≤ꢂꢄꢊ
ꢈꢉꢂ≤ꢂlꢂ≤ꢂꢄꢈ
shows ν(Ni–O) and ν(Ni–N) vibration absorption frequen-
−1
cies at 415 and 473 cm , respectively. These assignments
Refl. collected/unique/Rint
Completeness to θꢂ=ꢂꢄꢉ.ꢊꢊ°,ꢂ%
Data/restraints/ref. param.
Final Rꢈ/wRꢄ [Iꢀ>ꢀꢄσ(I)]
ꢈꢊ 9ꢅꢈ/ꢃꢄꢊꢈ/ꢊ.ꢊꢃꢅ
99.9
ꢃꢄꢊꢈ/ꢊ/ꢄꢇ9
ꢊ.ꢊꢃꢇꢄ/ꢊ.ꢈꢅꢅꢈ
ꢊ.ꢊꢃꢄꢆ/ꢊ.ꢊꢅ9ꢈ
ꢊ.ꢇꢅ/−ꢈ.ꢄꢇ
are consistent with the literature frequency values [33].
These new bands are not present in the spectrum of the
free ligand H L. As pointed out by Percy and Thornton,
2
Final Rꢈ/wRꢄ (all data)
the metal–oxygen and metal–nitrogen frequency assign-
ments are at times very difficult [36, 37].
−
ꢅ
Δρmax/min, e Å
reported for other transition metal complexes [20, 26, 27, 3.3 UV/Vis absorption spectra of H L
2
3
2–34, 36].
and its Ni(II) complex
The far-infrared spectrum of the Ni(II) complex was
−1
obtained in the region 500–100 cm in order to identify fre- The UV/Vis absorption spectra of the ligand H L and its
quencies due to the Ni–O and Ni–N bonds. The spectrum Ni(II) complex in diluted DMF solution are shown in Fig. 1.
2
Table 2:ꢁSelected bond lengths (Å) and angles (deg) for the title compound.a
Bond
Bond
Bond
Niꢈ–Nꢈ
Niꢈ–Oꢈ
Brꢈ–Cꢄ
Oꢈ–Cꢈ
Nꢄ–Cꢈꢊ
Cꢈ–Cꢄ
ꢄ.ꢊꢆꢅ(ꢅ)
ꢄ.ꢊꢊꢃ(ꢄ)
ꢈ.9ꢊꢈ(ꢅ)
ꢈ.ꢄꢋꢉ(ꢃ)
ꢈ.ꢄꢋꢈ(ꢃ)
ꢈ.ꢃꢄ9(ꢉ)
Niꢈ–Nꢄ
Niꢈ–Oꢃ
Brꢄ–Cꢃ
Oꢄ–Nꢈ
Nꢅ–Cꢈꢋ
Cꢈ–Cꢆ
ꢄ.ꢈꢊꢊ(ꢅ)
ꢄ.ꢊꢉꢈ(ꢄ)
ꢈ.9ꢊꢃ(ꢅ)
ꢈ.ꢃꢅ9(ꢃ)
ꢈ.ꢅꢅꢇ(ꢃ)
ꢈ.ꢃꢅꢊ(ꢃ)
Niꢈ–Nꢅ
ꢄ.ꢈꢈꢉ(ꢅ)
ꢄ.ꢈꢋꢆ(ꢄ)
ꢈ.ꢋꢉꢃ(ꢃ)
ꢈ.ꢃꢄꢇ(ꢉ)
ꢈ.ꢅꢄ9(ꢃ)
ꢈ.ꢅꢆ9(ꢉ)
Niꢈ–Oꢃ#
ꢈ
Clꢈ–Cꢈꢅ
Oꢄ–Cꢇ
Nꢅ–Cꢄꢈ
Cꢄ–Cꢅ
Angle
Angle
Angle
Oꢈ–Niꢈ–Oꢃ
Oꢈ–Niꢈ–Nꢅ
Oꢃ–Niꢈ–Nꢄ
Nꢄ–Niꢈ–Nꢅ
Niꢈ–Oꢈ–Cꢈ
Cꢈꢆ–Oꢃ–Niꢈ
Niꢈ–Nꢄ–Oꢅ
Niꢈ–Nꢅ–Cꢈꢋ
ꢇ9.ꢆꢃ(9)
ꢇꢇ.ꢃꢉ(ꢈꢊ)
ꢇꢉ.ꢋꢅ(ꢈꢊ)
ꢇꢇ.ꢇꢈ(ꢈꢈ)
ꢈꢅꢊ.ꢇ(ꢄ)
ꢈꢄꢊ.ꢄꢇ(ꢈꢇ)
ꢈꢄꢃ.ꢋ(ꢄ)
ꢈꢈꢇ.ꢃ(ꢄ)
Oꢈ–Niꢈ–Nꢈ
Oꢈ–Niꢈ–Oꢃ#
Oꢃ–Niꢈ–Nꢅ
ꢇꢋ.ꢃꢃ(ꢈꢊ)
ꢇꢇ.ꢇꢉ(ꢇ)
Oꢈ–Niꢈ–Nꢄ
Oꢃ–Niꢈ–Nꢈ
Oꢃ–Niꢈ–Oꢃ#
ꢈꢋꢃ.ꢉꢋ(ꢈꢈ)
ꢈꢋꢉ.ꢋꢈ(ꢈꢊ)
ꢇꢈ.ꢇ9(ꢇ)
ꢈꢋꢄ.ꢉꢇ(9)
9ꢇ.ꢈꢈ(ꢇ)
ꢈꢄꢋ.ꢋ(ꢄ)
ꢈꢄꢅ.ꢆ(ꢄ)
ꢈꢈꢃ.ꢈ(ꢅ)
ꢈ
ꢈ
9ꢈ.ꢈꢇ(9)
Nꢄ–Niꢈ–Nꢅ#
ꢈ
9ꢅ.ꢅꢊ(9)
Nꢅ–Niꢈ–Oꢃ
#ꢈ
Niꢈ–Oꢃ–Niꢈ#
Niꢈ–Nꢈ–Cꢋ
Niꢈ–Nꢅ–Cꢄꢈ
Cꢄ–Cꢈ–Cꢆ
ꢈ
Niꢈ–Oꢃ–Cꢈꢆ
Niꢈ–Nꢈ–Oꢄ
Niꢈ–Nꢄ–Cꢈꢊ
Oꢈ–Cꢈ–Cꢄ
ꢈꢄꢄ.ꢇ9(ꢈꢇ)
ꢈꢄꢈ.ꢉꢃ(ꢈ9)
ꢈꢄꢉ.ꢆ(ꢄ)
#
ꢈ
ꢈꢄꢊ.ꢇ(ꢅ)
aSymmetry transformations used to generate equivalent atoms: #11ꢂ−ꢂx, 1ꢂ−ꢂy, 1ꢂ−ꢂz.
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18ꢀꢁꢁꢁꢂꢀX.-Y. Dong et al.: Synthesis of a dinuclear nickel(II) complex
Fig. 3:ꢁIntramolecular hydrogen bonding interactions of the Ni(II)
complex (hydrogen atoms, except those forming hydrogen bonds,
are omitted for clarity).
weight loss occurs in the range of 193.5–225.7°C, cor-
responding to an endothermic peak, and the TG curve
shows that the weight loss corresponding to this temper-
ature range is 12.3%, which roughly coincides with the
value of 12.6%, calculated for the loss of two coordinated
pyridine molecules. The Ni(II) complex has no melting
point. The decomposing temperature of the Ni(II)
complex (ca. 187°C) is higher than that of the ligand
H L (ca. 153°C). It can be seen that the Ni(II) complex is
2
more thermally stable than the uncomplexed ligand H L.
2
Apparently its thermal stability is improved upon com-
plexation to Ni(II). Next, the second weight loss starts
at around 275.0°C. Subsequently, continuous mass loss
was observed up to 800°C. At this temperature, NiO is
formed. The total mass loss found (87.7%) was approxi-
mately consistent with that calculated (88.1%).
Fig. 2:ꢁ(a) Molecular structure and atom numbering of the Ni(II)
complex (hydrogen atoms are omitted for clarity). (b) Coordination
polyhedra of the Ni(II) atoms.
The UV/Vis spectrum of the ligand H L exhibits two
2
intense peaks at around 269 and 324 nm. The former
absorption peak can be assigned to the π–π* transition of
the benzene rings and the latter at 324 nm can be attrib-
uted to the intraligand π–π* transition of the oxime C=N 3.5 Structural description of the Ni(II)
group [38, 39].
complex
The absorption peak of the free ligand at 269 nm shifts
to the low energy region by about 5 nm in the Ni(II) complex, X-ray crystallographic analysis has revealed the crystal
indicating the coordination of Ni cations with (L) anions. structure of the Ni(II) complex. Selected bond lengths and
The absorption peak of the free ligand at 324 nm is absent
2+
2−
in the Ni(II) complex. However, a new absorption peak is
observed at 384 nm, which is assigned to that of an L→M
charge-transfer transition, which is characteristic for tran-
sition metal complexes in N O coordination spheres [40].
Table 3:ꢁHydrogen bond parameters (Å, deg) for the Ni(II) complex.
D–H·ꢁ·ꢁ·A
ꢂ
d(D–H) ꢂ d(H·ꢁ·ꢁ·A) ꢂ d(D·ꢁ·ꢁ·A) ꢂ ∠DHAꢂ Symmetry
2
2
code A
C9–H9B·ꢂ·ꢂ·Oꢃ
ꢌ
ꢊ.9ꢋ ꢌ
ꢄ.ꢃꢆ ꢌ ꢅ.ꢅ9ꢅ(ꢃ) ꢌ ꢈꢆꢊꢌ ꢈꢂ−ꢂx, ꢈꢂ−ꢂy,
ꢈꢂ−ꢂz
ꢄ.ꢉꢈ ꢌ ꢄ.9ꢆꢇ(ꢉ) ꢌ ꢈꢈꢊꢌ
ꢅ.ꢈꢉ ꢌ ꢅ.ꢇꢈꢋ(ꢃ) ꢌ ꢈꢅꢊꢌ
ꢅ.ꢊꢃ ꢌ ꢅ.ꢋꢃ9(ꢉ) ꢌ ꢈꢅꢃꢌ
3
.4 Thermal properties
Cꢈꢋ–Hꢈꢋ·ꢂ·ꢂ·Oꢈ
Cꢄꢊ–Hꢄꢊ·ꢂ·ꢂ·Clꢈ
Cꢈꢋ–Hꢈꢋ·ꢂ·ꢂ·Brꢄ ꢌ
ꢌ
ꢌ
ꢊ.9ꢅ ꢌ
ꢊ.9ꢅ ꢌ
ꢊ.9ꢅ ꢌ
The thermal decomposition process of the Ni(II) complex
can mainly be divided into two stages. First, the initial
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X.-Y. Dong et al.: Synthesis of a dinuclear nickel(II) complexꢀꢂꢁꢁꢁꢀ419
Fig. 5:ꢁView of the 2D supramolecular structure of the Ni(II) complex
along the bc plane (hydrogen atoms, except those forming hydrogen
bonds, are omitted for clarity).
Fig. 4:ꢁView of the 2D supramolecular structure of the Ni(II) complex
along the crystallographic ac plane (hydrogen atoms, except those
forming hydrogen bonds, are omitted for clarity).
angles are given in Table 2. The molecular structure of the
Ni(II) complex is shown in Fig. 2.
The Ni(II) complex crystallizes in the orthorhombic
space group Pbca. The molecular structure consists of
2
+
2−
two Ni and two (L) units, and two coordinated pyridine
#
1
molecules. The Ni1 and Ni1 atoms are both located in the
2−
N O coordination cavity of the (L) units. Each Ni atom is
2
2
hexa-coordinated by two oxygen and two nitrogen atoms
2−
from an (L) unit, one nitrogen atom of a coordinated pyri-
dine molecule and one oxygen atom from another [Ni(L)
(
py)] moiety, and has a slightly distorted octahedral geom-
etry (Fig. 2). In previous reports, the Salamo-type Ni(II)
complexes are essentially mono- [30, 31], tri- [26, 31, 32]
and hepta-nuclear [33], and the ratios of the ligand to Ni
units are 1:1, 2:3 and 2:7. The Ni(II) complex reported here
has the ratio 2:2.
Fig. 6:ꢁView of the 3D supramolecular structure of the Ni(II) complex
3
.6 Supramolecular interaction of the Ni(II)
complex
(
hydrogen atoms, except those forming hydrogen bonds, are
omitted for clarity).
In the crystal structure of the Ni(II) complex, there are
two intramolecular hydrogen bonding interactions C9– in constructing and stabilizing the crystal structure.
H9B·ꢀ·ꢀ·O4 and C17–H17·ꢀ·ꢀ·O1 (Fig. 3) [41–44]. Selected Neighboring complex molecules are linked into an
bond lengths and angles for hydrogen bonding inter- infinite 2D supramolecular network by intermolecular
actions are given in Table 3. As shown in Figs. 4 and hydrogen bondings C20–H20·ꢀ·ꢀ·Cl1 and C17–H17·ꢀ·ꢀ·Br2.
5
, the molecules are connected by four intermolecu- Finally, an infinite 3D supramolecular structure is
lar hydrogen bonding interactions which play a role formed (Fig. 6) [45, 46].
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20ꢀꢁꢁꢁꢂꢀX.-Y. Dong et al.: Synthesis of a dinuclear nickel(II) complex
[
[
17] H. L. Wu, Y. C. Bai, Y. H. Zhang, G. L. Pan, J. Kong, F. R. Shi, X. L.
Wang, Z. Anorg. Allg. Chem. 2014, 640, 2062.
4
Conclusions
18] H. L. Wu, G. L. Pan, Y. C. Bai, Y. H. Zhang, H. Wang, F. R. Shi,
X. L. Wang, J. Kong, J. Photochem. Photobio. B 2014, 135, 33.
We have reported a new dinuclear Ni(II) complex, [{Ni(L)
(
C H N)} ], with a new Salamo-type ligand H L. The Ni(II) [1ꢍ] H. L. Wu, G. L. Pan, Y. C. Bai, H. Wang, J. Kong, F. R. Shi,
5 5 2 2
+
2
2−
Y. H. Zhang, X. L. Wang, J. Chem. Res. 2014, 38, 211.
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complex contains two Ni and two (L) units, and two
coordinated pyridine molecules. Each Ni(II) atom is hexa-
coordinated by two oxygen and nitrogen atoms from an
[
[
2
−
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2
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