Syntheses and crystal structures of four supramolecular halides/pseudohalides: [(ZnCl4)(BPX)], [(CdCl4)(BPX)], [(HgCl4)(BPX)], and [Cu4(SCN)6(BPX)] n directed by 1,4-Bis(pyridinium)xylol cations

Article abstract of DOI:10.1080/15533174.2011.555859

Four supramolecular compounds, [(ZnCl₄)(BPX)] 1, [(CdCl ₄)(BPX)] 2, [(HgCl₄)(BPX)] 3 and [Cu₄(SCN) ₆(BPX)]_n4 (BPX = 1, 4-bis(pyridinium)xylol), were synthesized and characterized by IR spectrum and X-ray crystallography. The crystal structures of 1-3 show that they all crystallize in monoclinic systems with mononuclear tetrachlorometallate structure. Compound 4 crystallizes in triclinic system, space group P-1 in which four SCN^-ions serve as bridging ligands to link four Cu(I) ions, giving rise to a 16-numbered ring. Many 16-membered rings are bridged by SCN^- to form a one-dimensional chain structure.Furthermore, Cu-Cu bonds bridge two chain structures to form a one-dimensional complex chain structure. Copyright Taylor & Francis Group, LLC.

Full text of DOI:10.1080/15533174.2011.555859

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Syntheses and Crystal Structures of Four
Supramolecular Halides/Pseudohalides:
[(ZnCl4)(BPX)], [(CdCl4)(BPX)], [(HgCl4)(BPX)],
and [Cu4(SCN)6(BPX)] n Directed by 1, 4-
Bis(pyridinium)xylol Cations
Wen-Zhen Fu a , Han-Qi Wang a , Bei Wang a , Hao-Jie Duan a , Xin-Xin Cui a , Wei-Juan
Wang a , Zhe-Guang Wang b , Zhen-Hua Zhang a , Xiu-Cun Liu a & Yun-Yin Niu a
a Department of Chemistry , Zhengzhou University , Zhengzhou, P. R. China
b College of Information and Management Science , Henan Agricultural University ,
Zhengzhou, P. R. China
Published online: 12 Apr 2011.
To cite this article: Wen-Zhen Fu , Han-Qi Wang , Bei Wang , Hao-Jie Duan , Xin-Xin Cui , Wei-Juan Wang , Zhe-Guang
Wang , Zhen-Hua Zhang , Xiu-Cun Liu & Yun-Yin Niu (2011) Syntheses and Crystal Structures of Four Supramolecular
Halides/Pseudohalides: [(ZnCl4)(BPX)], [(CdCl4)(BPX)], [(HgCl4)(BPX)], and [Cu4(SCN)6(BPX)] n Directed by 1, 4-
Bis(pyridinium)xylol Cations, Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 41:3,
272-278
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Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 41:272–278, 2011
Copyright © Taylor & Francis Group, LLC
ISSN: 1553-3174 print / 1553-3182 online
DOI: 10.1080/15533174.2011.555859
Syntheses and Crystal Structures of Four Supramolecular
Halides/Pseudohalides: [(ZnCl4)(BPX)], [(CdCl4)(BPX)],
[(HgCl4)(BPX)], and [Cu4(SCN)6(BPX)]n Directed by
1, 4-Bis(pyridinium)xylol Cations
Wen-Zhen Fu,1 Han-Qi Wang,1 Bei Wang,1 Hao-Jie Duan,1 Xin-Xin Cui,1
Wei-Juan Wang,1 Zhe-Guang Wang,2 Zhen-Hua Zhang,1 Xiu-Cun Liu,1
and Yun-Yin Niu1
1Department of Chemistry, Zhengzhou University, Zhengzhou, P. R. China
2College of Information and Management Science, Henan Agricultural University, Zhengzhou, P. R.
China
der Waals force, electrostatic interaction, C H/π interaction,
etc.[8−11]
With the rapid development of supramolecular compounds,
Four supramolecular compounds, [(ZnCl4)(BPX)] 1,
[(CdCl4)(BPX)] 2, [(HgCl4)(BPX)] 3 and [Cu4(SCN)6(BPX)]n4
(BPX = 1, 4-bis(pyridinium)xylol), were synthesized and charac-
terized by IR spectrum and X-ray crystallography. The crystal
structures of 1-3 show that they all crystallize in monoclinic
systems with mononuclear tetrachlorometallate structure. Com-
pound 4 crystallizes in triclinic system, space group P-1 in which
four SCN−ions serve as bridging ligands to link four Cu(I)
ions, giving rise to a 16-numbered ring. Many 16-membered
rings are bridged by SCN−to form a one-dimensional chain
structure.Furthermore, Cu-Cu bonds bridge two chain structures
to form a one-dimensional complex chain structure.
a large number of coordination polymers have been synthe-
sized with different crystal structures since discovered. And the
supramolecular polymers directed by organic cations have be-
come a new research focus owning to their unique features, such
as good catalytic effect, powerful magnetic performance, good
nonlinear optical property, and so on.[12−13] Organic cations con-
nect with polyanions by weak interactions to form stacked struc-
tures of infinite space. Bridging N-donor ligands had generally
been employed for the construction of M(IB, IIB)-X-containing
polymers, and thiocyanate (SCN−) coordinating to metal cen-
ters as an end-to-end bridging ligand between two metal centers,
though both sulfur and nitrogen atoms were infrequently applied
in the synthesis successfully.[14−18]
Keywords 1, 4-bis(pyridinium)xylol, crystal structure, coordination
polymer
In this article, the authors select the azotic heterocyclic
organic cation BPX to carry on a self-assembly and four novel
M(IB, IIB) compounds, [(ZnCl4)(BPX)] 1, [(CdCl4)(BPX)]
2, [(HgCl4)(BPX)] 3 and [Cu4(SCN)6(BPX)]n 4, were ob-
tained and structurally characterized. We had previously
reported several coordination compounds, [Cu2(SCN)4(BPX)]n
INTRODUCTION
Recently, more attention has been paid to design and synthe-
sis of new supramolecular compounds because of their novel
structures and potential applications in magnetism, electrical
conductivity, luminescence, biology, catalysis, etc.[1−7] The
supramolecular compounds with certain structures and func-
tions can be obtained by self-assembly, that is forming spon-
taneously by synergistic actions of hydrogen bonding, van
5[19]
,
[(Bph4)2(BPX)][20] 6, [(HgCl2.75 1.25)(BPX)][21]7,
I
[Fe(CN)6(BPX).4H2O][22] 8, directed by the same organic
cation BPX. Interestingly, the structural unit of the polymer
5 consisted of two Cu(I) centers, four SCN−ions, and one
BPX. It formed an infinite one-dimensional ladder-shaped
structure. However, the structural unit of the title polymer
[Cu4(SCN)6(BPX)]n 4 consists of four Cu(I) centers, six
Received 14 May 2010; accepted 7 September 2010.
The author acknowledges the NSFC (No.20671083, No. J0830412) SCN−ions, and one BPX. The structure units connect to each
other by SCN−ions to form an infinite one-dimensional chain
and the 2009 Innovative Experiment Program for Undergraduates of
ZZU.
structure. Moreover, two such one-dimensional chains connect
to each other through Cu(I) Cu(I) bonds to form an interesting
one-dimensional complex chain structure. From the conclusion
Address correspondence to Yun-Yin Niu, Department of Chem-
istry, Zhengzhou University, Zhengzhou 450052, P. R. China. E-mail:
niuyy@zzu.edu.cn
272

FOUR SUPRAMOLECULAR HALIDES/PSEUDOHALIDES
273
TABLE 1
Crystallographic data and structural refinement for compounds 1–4
Compound
1
2
3
4
Empirical formula
Formula weight
Crystal system
Space group
Crystal size(mm)
a/◦A
C18 H18 Cl4 N2 Zn
469.51
Monoclinic
P2 (1)/c
0.45 × 0.36 × 0.32
13.5795 (11)
9.1468 (7)
16.4189 (13)
90
98.6170 (10)
90
2016.4 (3)
1.547
C18 H18 Cd Cl4 N2
516.54
Monoclinic
P2 (1)/c
0.26 × 0.13 × 0.09
13.8251 (17)
9.2389 (12)
16.395 (2)
90
98.9000 (10)
90
2068.9 (4)
1.658
C18 H18 Cl4 Hg N2
604.73
Monoclinic
P2 (1)/c
0.19 × 0.13 × 0.10
13.7838 (17)
9.2356 (11)
16.324 (2)
90
98.840 (2)
90
2053.4 (4)
1.956
C12 H9 Cu2 N4 S3
432.49
Triclinic
P-1
0.25 × 0.15 × 0.10
7.3672 (10)
10.3530 (13)
10.8252 (14)
106.7770 (10)
103.080 (2)
10.8252 (14)
768.12 (17)
1.870
b/◦A
c/◦A
α/◦
β/◦
γ/◦
V/ ◦A3
Dc/g· Ecm−3
Z
µ
4
2
4
2
1.752 mm−1
952
1.576 mm−1
1024
8.020 mm−1
1152
3.171 mm−1
430
F (000)
R (int)
0.0192
0.0280
0.0424
0.0148
Theta range for data
collection (·)
Data / restraints /
parameters
Goodness-of-fit on
Fˆ2
2.56 to 27.50
2.51 to 27.50
2.54 to 25.50
2.42 to 25.50
4624 / 0 / 226
1.015
4730 / 0 / 226
1.013
3701 / 0 / 226
1.001
2851 / 0 / 190
1.038
Reflections
collected/unique
Max. and min.
transmission
Final R
17317 / 4624
15653 / 4730
0.8712 and 0.6811
11749 / 3701
0.5101 and 0.3140
5902 / 2851
0.7360 and 0.5033
0.6058 and 0.5075
R1 = 0.0269, wR2 =
R1 = 0.0296, wR2 =
0.0608
R1 = 0.0334, wR2 =
0.0583
R1 = 0.0250, wR2 =
0.0537
indices[I>2sigma(I)] 0.0640
R indices(all data)
R1 = 0.0365, wR2 =
R1 = 0.0480, wR2 =
R1 = 0.0627, wR2 =
R1 = 0.0327, wR2 =
0.0683
0.0678
0.0691
0.0570
Largest diff. peak and 0.302 and −0.224 e.Aˆ-3 0.235 and −0.390 e.Aˆ 0.519 and −0.669 e.Aˆ 0.326 and −0.333 e.Aˆ
hole
−3
−3
−3
that we had reported, the compounds were easy to generate 1D
or 2D polymers when we used CuSCN.
Synthesis of [(ZnCl4)(BPX)] (1)
To a solution of ZnCl2 (0.05 mmol, 6.8 mg) in DMF (5 ml)
was added dropwise a solution of BPX.Cl2(0.05 mmol, 8.8 mg)
in CH3OH (5 ml), and then added dropwise additional DMF
until white precipitate completely disappeared. The reaction
mixture was allowed to stand at room temperature for about a
week in the dark. The white crystals suitable for X-ray single
crystal diffraction analysis were collected, with a yield of 52%.
IR (KBr, cm−1): 3051 m, 1630 s, 1480 s, 1200 m, 1151 s, 783
m, 750 s, 676 s, 606 m, 486 m.
EXPERIMENTAL
Material and Measurement
Reagents and solvents all were analytical pure grade, and
α αꢀ-Dichlor-p-xylol was purchased from Sigma-Aldrich, used
without further purification. The organic cation BPX was pre-
pared as the reported method.[19]The IR spectra were measured
with a Bruker Tensor 27 spectrophotometer in the range 4000–
400 cm−1using KBr pellets.
Synthesis of [(CdCl4)(BPX)] (2)
Compound (2) was obtained via a similar procedure as that
of (1). The white crystals suitable for X-ray single crystal

274
W.-Z. FU ET AL.
TABLE 2
Selected bonds lengths (A◦) and angles (·) for compounds 1–3
Compound 1
Compound 2
Compound 3
Zn(1)-Cl(3)
Zn(1)-Cl(4)
Zn(1)-Cl(2)
Zn(1)-Cl(1)
Cl(3)-Zn(1)-Cl(4)
Cl(3)-Zn(1)-Cl(2)
Cl(4)-Zn(1)-Cl(2)
Cl(3)-Zn(1)-Cl(1)
Cl(4)-Zn(1)-Cl(1)
Cl(2)-Zn(1)-Cl(1)
2.2527(6)
2.2603(6)
2.2871(5)
2.2932(5)
111.63(2)
110.52(2)
110.45(2)
110.93(2)
110.52(2)
102.43(2)
Cd(1)-Cl(2)
Cd(1)-Cl(3)
Cd(1)-Cl(1)
Cd(1)-Cl(4)
N(1)-C(5)
N(1)-C(1)
N(1)-C(6)
N(2)-C(10)
2.4317(8)
2.4373(8)
2.4746(7)
2.4788(8)
1.321(3)
1.330(3)
1.497(3)
1.339(3)
1.343(3)
1.500(3)
111.65(3)
109.81(3)
111.18(3)
112.88(3)
111.46(3)
99.25(2)
Hg(1)-Cl(1)
Hg(1)-Cl(2)
Hg(1)-Cl(4)
Hg(1)-Cl(3)
N(1)-C(5)
N(1)-C(1)
N(1)-C(6)
N(2)-C(14)
2.4411(18)
2.4440(18)
2.5151(15)
2.5217(17)
1.341(7)
1.342(7)
1.504(7)
1.305(7)
1.344(8)
N(2)-C(14)
N(2)-C(15)
N(2)-C(10)
N(2)-C(15)
1.490(7)
Cl(2)-Cd(1)-Cl(3)
Cl(2)-Cd(1)-Cl(1)
Cl(3)-Cd(1)-Cl(1)
Cl(2)-Cd(1)-Cl(4)
Cl(3)-Cd(1)-Cl(4)
Cl(1)-Cd(1)-Cl(4)
Cl(1)-Hg(1)-Cl(2)
Cl(1)-Hg(1)-Cl(4)
Cl(2)-Hg(1)-Cl(4)
Cl(1)-Hg(1)-Cl(3)
Cl(2)-Hg(1)-Cl(3)
Cl(4)-Hg(1)-Cl(3)
113.97(6)
109.62(6)
111.38(7)
112.45(6)
111.16(6)
97.03(5)
cm−1): 3047 m, 1627 s, 1483 s, 1205 m, 1153 s, 780 m, 746 s,
676 s, 607 m, 460 m.
diffraction analysis were collected, with a yield of 46%. IR
(KBr, cm−1): 3049 m, 1627 s, 1483 s, 1207 m, 1154 s, 780 m,
746 s, 676 s, 606 m, 486 m.
Synthesis of [Cu4(SCN)6(BPX)]n(4)
Synthesis of [(HgCl4)(BPX)] (3)
To a mixing solution of CuCl2(0.05 mmol, 6.75 mg) and
Compound (3) was obtained via a similar procedure as that of KSCN (0.01 mmol, 9.7 mg) in DMF/H2O was added dropwise
(1). The white crystals suitable for X-ray single crystal diffrac- a solution of BPX.Cl2(0.05 mmol, 8.8 mg) in CH3OH (5 ml), and
tion analysis were collected, with a yield of 63%. IR (KBr, then added dropwise additional DMF to light yellow precipitate
TABLE 3
Selected bonds lengths (A◦) and angles (·) for compound 4
Cu(1)-N(2)#1
Cu(1)-S(3)#2
Cu(2)-N(3)
Cu(2)-S(2)
Cu(2)-Cu(2)#2
S(3)-Cu(1)#2
N(2)#1-Cu(1)-N(1)
N(1)-Cu(1)-S(3)#2
N(1)-Cu(1)-Cu(1)#1
N(3)-Cu(2)-S(1)
S(1)-Cu(2)-S(2)
S(1)-Cu(2)-S(2)#2
N(3)-Cu(2)-Cu(2)#2
S(2)-Cu(2)-Cu(2)#2
C(1)-S(1)-Cu(2)
C(2)-S(2)-Cu(2)#2
C(3)-S(3)-Cu(1)#2
C(2)-N(2)-Cu(1)#1
C(3)-N(3)-Cu(2)
C(3)-N(3)-Cu(2)
1.899(2)
2.3206(8)
1.946(2)
2.4192(8)
2.8798(8)
2.3206(8)
131.61(9)
116.37(7)
87.09(7)
120.61(7)
114.66(3)
105.19(3)
114.23(7)
54.30(2)
102.58(9)
100.91(8)
99.15(9)
170.9(2)
162.1(2)
162.1(2)
Cu(1)-N(1)
Cu(1)-Cu(1)#1
Cu(2)-S(1)
Cu(2)-S(2)#2
S(2)-Cu(2)#2
N(2)-Cu(1)#1
N(2)#1-Cu(1)-S(3)#2
N(2)#1-Cu(1)-Cu(1)#1
S(3)#2-Cu(1)-Cu(1)#1
N(3)-Cu(2)-S(2)
N(3)-Cu(2)-S(2)#2
S(2)-Cu(2)-S(2)#2
S(1)-Cu(2)-Cu(2)#2
S(2)#2-Cu(2)-Cu(2)#2
C(2)-S(2)-Cu(2)
Cu(2)-S(2)-Cu(2)#2
C(1)-N(1)-Cu(1)
C(3)-N(3)-Cu(2)
C(3)-N(3)-Cu(2)
1.903(2 )
3.0575(8)
2.2875(7)
2.4525(8)
2.4525(8)
1.898(2)
111.75(7)
91.83(7)
97.36(3)
101.97(7)
106.10(7)
107.53(2)
125.00(2)
53.23(2)
103.90(9)
72.47(2)
165.7(2)
162.1(2)
162.1(2)

FOUR SUPRAMOLECULAR HALIDES/PSEUDOHALIDES
275
FIG. 1. The basic structural unit of compound 1.
until completely disappeared. The reaction mixture was allowed
to stand at room temperature for several days. The light yellow
transparent crystals suitable for X-ray single crystal diffraction
analysis were collected, with a yield of 43%. IR (KBr, cm−1):
3053 m, 2091 s, 1626 m, 1484s, 1208 m, 1160 m, 797 m, 769
s, 739 m, 674 m, 600 m, 448 m.
FIG. 3. 3D architecture of compound 1.
The structural unit consists of one Zn(II), four Cl− ions and one
BPX. The Zn atom is four-coordinated with four Cl atoms to
form deformed tetrahedron geometry, the bond lengths of Zn-
˚
˚
Cl arrange from 2.2513(7) A to 2.2903(7) A, bond angles vary
from 110.39(3)◦ to 111.45(3)◦
X-ray Structural Determination
Within each unit, Cl atom connects with BPX2+ through
hydrogen bond (shown in Figure 2), and the units form a
3D architecture through this weak interactions (shown in
Figure 3).
Crystallographic data for the title compounds 1–4 were
collected at 291(2) K on a Bruker APEX-II area-detector
diffractometer equipped with graphite-monochromatized
Mo-Ka radiation (λ = 0.71073A◦). The structures were solved
by direct methods and expanded using Fourier techniques. The
non-hydrogen atoms were refined with anisotropic thermal
parameters. The hydrogen atoms were assigned with common
isotropic displacement factors and included in the final refine-
ment by using geometrical constraints. The structures were
refined with full-matrix least-squares techniques on F2 using the
SHELXTL-97 program package. Crystal data are summarized
in detail in Table 1. Selected bond lengths and angles of the
title compounds 1–4 are respectively listed in Tables 2–3.
Crystal Structure of [(CdCl4)(BPX)] (2)
The structure of compound [(CdCl4)(BPX)] is similar with
compound 1.
The structural unit consists of one Cd(II), four Cl− ions,
and one BPX. The Cd atom is four-coordinated with four
Cl atoms to form deformed tetrahedron geometry, the bond
˚
˚
lengths arrange from 2.4317(8) A to 2.4788(8) A , the bond
angles vary from 109.81(3)◦ to 112.88(3)◦. Within each unit Cl
atom connects with BPX2+ through hydrogen bond (shown in
Figure 4), and the units form a huge 3D architecture through
this weak interaction (shown in Figure 5).
RESULTS AND DISCUSSION
Crystal Structure of [(ZnCl4)(BPX)] (1)
Single-crystal structure analysis revealed that compound 1
crystallized in monoclinic system with space group P2(1)/c.
The crystal structural unit of compound 1 is shown in Figure 1.
FIG. 2. Weak hydrogen bonds between Cl and BPX2+ in 1.
FIG. 4. Weak hydrogen bonds between Cl and BPX2+ in 2.

276
W.-Z. FU ET AL.
FIG. 5. Stereo architecture of compound 2.
Crystal Structure of [(HgCl4)(BPX)] (3)
The structural unit consists of one Hg(II), four Cl− ions, and
one BPX (shown in Figure 6). The Hg atom is tetra-coordinated
with four Cl atoms to form tetrahedron geometry, the bond
FIG. 7. 3D architecture of compound 3.
˚
˚
lengths arrange from 2.4427(11) A to 2.5226(10) A, the bond
angles vary from 97.10(3)◦ to 113.82(4)◦ . Within each unit
Cl atom and Hg atom connect with BPX2+ through hydrogen tetrahedron geometry (shown in Figure 9). Furthermore, SCN¯
bonds (shown in Figure 6), and the units form a 3D architecture ions serve as bridging ligands to link each sixteen-membered
through this weak fact (shown in Figure 7).
tetra center to form an infinite one-dimensional chain structure,
two such one-dimensional chains combine together through
Cu(I)-Cu(I) bonds to form a one-dimensional composite chain
Crystal Structure of [Cu4(SCN)6(BPX)]n(4)
˚
structure. Two kinds of Cu· · ·Cu bond lengths are 5.584A and
Single-crystal X-ray diffraction analysis reveals that
[Cu4(SCN)6(BPX)]n4 crystallizes in triclinic system with space
group P-1. Selected bond lengths and angles of compound 4 are
list in Table 3.
The structure unit consists of four Cu centers, six SCN¯ ions,
and one BPX. Four SCN¯ ions serve as bridging ligands to link
four Cu ions, giving rise to a sixteen-membered ring, among
which Cu(1) and Cu(1A) form one CuI CuI bond between them
(shown in Figure 8).
There are two kinds of coordinate environments in the solid
state. One Cu ion is tri-coordinated and each atom is surrounded
by three NCS− ions to form triangle planar geometry; and the
other Cu ion is tetra-coordinated with four NCS− ions to form
˚
5.358A in each sixteen-membered ring. The Cu(1)-Cu(1)# and
˚
Cu(2) and Cu(2)# bond lengths are 3.0575(8) A and 2.8798(8)
˚
˚
˚
˚
˚
A, Cu(1)-N bond lengths arrange from 1.899(2) A to 1.946(2)
A, Cu(1)-S bond lengths arrange from 2.2875(7) A to 2.4525(8)
◦
A. The N(2)#1-Cu(1)-N(1) bond angle is 131.61(9) , N-Cu(1)-
S bond angles vary form 111.75(7)◦ to 116.37(7)◦, N-Cu(2)-
S bond angles vary from 101.97(7)◦ to 106.10(7)◦, S-Cu(1)-S
bond angles vary from 105.19(3)◦ to 114.66(3)◦.
The sulfur atom, nitrogen atom and copper atom of each
structural unit form weak H· · ·S bond, H· · ·N bond with hy-
drogen atoms from BPX2+cation as is shown in Figure 10.
Thus, these crystal structure units are connected each other
to form an infinite space packing structure, as is shown in
Figure 11.
FIG. 6. Weak hydrogen bonds within Cl and BPX2+, Hg and BPX2+in 3.
FIG. 8. The basic structural unit of compound 4.

FOUR SUPRAMOLECULAR HALIDES/PSEUDOHALIDES
277
FIG. 9. The one-dimensional complex chain structure of compound 4.
CONCLUSION
In summary, we select the azotic heterocyclic organic cation
BPX to carry on a self-assembly and four novel M(IB, IIB) com-
pounds, [(ZnCl4)(BPX)]1, [(CdCl4)(BPX)]2, [(HgCl4)(BPX)]3
and [Cu4(SCN)6(BPX)]n4, were obtained and structurally char-
acterized.
More intriguing, the structural unit of the polymer
[Cu4(SCN)6(BPX)]n4 consists of four Cu(I) centers, six SCN−
ions, and one BPX. The structure units connect to each other
by SCN−ions to form an infinite one-dimensional chain struc-
ture. Moreover, two such one-dimensional chains connect to
each other through Cu(I)-Cu(I) bond to form a one-dimensional
composite chain structure. By contrast, the conformations of the
BPX cations in 1-8 differ slightly. Extensive hydrogen bonding
is found in the crystal packing structure of all these compounds.
SUPPLEMENTARY MATERIAL
Crystallographic data for the structural analysis have been
deposited with the Cambridge Crystallographic Data Center,
FIG. 10. Weak H· · ·S bond interactions of compound 4.
FIG. 11. Packing structure of compound 4.

278
W.-Z. FU ET AL.
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from The Director, CCDC, 12 Union Road, Cambridge, CB2
1EZ, UK (fax: 44-1223-336–033; email: deposit@ccdc.cam.
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