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Article

Synthesis and Structure of the Cadmium (II) Complex: [Cd(C5H5N)2(S2CO-n-C4H9)2]

1
Department of Chemistry, South China Normal University, Guangzhou 510631, P.R. China
2
Department of Foundation, Zhongkai Agrotechnical College, Guangzhou 510230, P.R. China
3
Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 300, P.R. China
*
Author to whom correspondence should be addressed.
Molecules 2002, 7(7), 549-553; https://doi.org/10.3390/70700549
Submission received: 9 February 2002 / Revised: 30 July 2002 / Accepted: 31 July 2002 / Published: 31 July 2002

Abstract

:
The [Cd(C5H5N)2(S2CO-n-C4H9)2] adduct of pyridine with [Cd(S2CO-n-C4H9)2]n was synthesized and characterized by IR, elemental analysis, 1H-NMR and X-ray diffraction analysis. The crystasl belong to the monoclinic system, space group P2(1)/c with Z=2. Cell dimensions are a=1.1094(12), b=0.6152(6), c=1.7985(19) nm, • =96.148(2)°, V=1.2204(2)nm3. The tructure was refined to R=0.0246 and wR=0.0645 for 2624 reflections with I>2•(I). The complex has a centrosymmetric molecule structure.

Introduction

Metal xanthate complexes and their reaction products with a variety of Lewis bases have been extensively studied [1,2,3]. The soluble alkali metal xanthates are widely used in extraction and separation of Hg, Ag, Cd, etc., [4,5,6]. Sodium and potassium ethyl xanthate have antidotal effects in acute mercurial poisoning. Transition metal xanthate complexes have been investigated for nonlinear optical applications [7], and Cd xanthate was demonstrated to have nonlinear optical properties and generated a very strong 2nd harmonic signal. To the best of our knowledge, the reaction products of Cd xanthate with Lewis bases have been much less extensively studied than other similar compounds. In this paper, we report the synthesis and X-ray crystal structure of [Cd(C5H5N)2(S2CO-n-C4H9)2]. Like most bidentate dithiolate complexes, the reaction of [Cd(S2CO-n-C4H9)2]n with pyridine destroyed the original polymeric structure to yield the corresponding bis-(Lewis base) adduct.

Results and Discussion

The X-ray structure of the cadmium complex [Cd(C5H5N)2(S2CO-n-C4H9)2] is built up of centrosymmetric monomeric entities. Figure 1 shows a perspective view of the monomeric unit with the atomic numbering scheme. Figure 2, a perspective view of the crystal packing in the unit cell. The cadmium (II) atom is in an octahedral environment surrounded by two chelating xanthate anions and two pyridine ligands. Two nitrogen atoms occupy the apical site.
Figure 1. The atomic numbering scheme of the cadmium complex
Figure 1. The atomic numbering scheme of the cadmium complex
Molecules 07 00549 g001

Cd(1)-S(1)0.2644(5)N(1)#1-Cd(1)-N(1)180.00(8)
Cd(1)-S(2)0.2730(5)N(1)-Cd(1)-S(1)#190.49(4)
S(1)-C(6)0.1696(18)N(1)-Cd(1)-S(1)89.51(4)
S(2)-C(6)0.1688(19)S(1)#1-Cd(1)-S(1)180.0
O(1)-C(6)0.1337(2)N(1)-Cd(1)-S(2)#190.10(4)
O(1)-C(7)0.1446(2)S(1)#1-Cd(1)-S(2)#167.654(15)
S(1)-Cd(1)-S(2)#1112.346(15)
N(1)-Cd(1)-S(2)89.90(4)
S(1)-Cd(1)-S(2)67.654(15)
S(2)#1-Cd(1)-S(2)180.00(3)
Four sulfur atoms and one cadmium atom are almost coplanar. The bond angles around Cd(II) are in the range 67.654(1)-180.00(3)°. The S(1)-S(2)-S(1)#1-S(2)#1 occupy the equatorial plane and the chelated planes composed by cadmium and xanthate are coplanar with it. The terminal n-butyl groups of xanthate take on a trans-configuration. Two pyridine rings are coplanar and almost perpendicular to the O(1)-S(1)-S(2)-O(1)#1-S(1)#1-S(2)#1 plane.
Figure 2. Cell contents of the complex.
Figure 2. Cell contents of the complex.
Molecules 07 00549 g002
The S(1)-C(6) and S(2)-C(6) bond distances tend to average, and the C-S distances show double bond character due to delocalization over the two C-S bonds. The O(1)-C(6) bond distance [1.337(2)Å] is shorter than the O(1)-C(7) [1.446(2) Å] as a consequence of the hybridization of the carbon atom [8]. A stereoview of the unit cell packing of the compound shows that the molecules are parallel each other and form a layered array. In the 1H-NMR spectra of the complexes in CDCl3, the corresponding pyridine hydrogen resonances are shifted to lower field compared to those of the free pyridine (δ=7.16, 7.55, 8.52 ppm), thus indicating that the pyridines take part in coordination to the metal ion.

Conclusions

We have reported the first synthesis and X-ray crystal structure of [Cd(C5H5N)2(S2CO-n-C4H9)2].

Experimental

General

All reagents and chemicals were used as received unless otherwise noted. Sodium n-butyl xanthate was prepared by reaction of n-butanol, NaOH, and CS2. [Cd(SSO-n-C4H9)2]n was prepared by reaction of sodium n-butyl xanthate and Cd(NO3)·4H2O. [Cd(C5H5N)2(S2CO-n-C4H9)2] was synthesized by stirring [Cd(S2CO-n-C4H9)2]n with excess pyridine in acetone for 30 minutes. IR(KBr):•=C-H 3060, •C-O 1200~1000, •C-S 750~620, •C-C C-N 1600~1440cm-1; 1H-NMR (CDCl3) δ(ppm): 0.93 (m, 3H, CH3), 1.43 (m, 2H, CH2CH3), 1.79 (m, 2H, CH2CH2CH3), 4.40 (t, J=2Hz, 2H, OCH2), 7.42(m, 2H, Pyridine ring 3-H, 5-H), 7.82 (m, 1H, Pyridine ring 4-H), 8.76 (m, 2H, Pyridine ring 2-H, 6-H). Elemental analysis: C 41.47%, H 5.07%, N 5.16%. Calcd.: C 42.20%, H 4.96%, N 4.92%.

X-ray analysis

A pale–yellow columnar single crystal suitable for X-ray structure determination was obtained by evaporation of a suitable solution at room temperature for few days. Crystal data collections were performed on a Siemens P4 diffractometer using Mo-Κα radiation (λ=0.71073Å) and the ω/2θ (θ = 1.85-27.97) scan technique at 295(2) K. The reflections were corrected for absorption by the Gaussian integration method for Lorentz polarization and secondary extinction effects. The structure was solved by the Patterson method and subsequent difference Fourier techniques and refined by Full-matrix least-squares on F2 methods with anisotropic thermal factors for all non-hydrogen atoms. A number of the hydrogen atoms were placed in calculated positions. All calculations were performed using the SHELXTL [9] suite of computer programs.

Acknowledgments

Project supported by the Natural Science Foundation of Guangdong Province (990463) and the National Natural Science Foundation of China (29561002).

References and Notes

  1. Litipova, Sh.Z.; Khakimova, V.K.; Tukhtaev, S. Uzb. Khim. Zh. 1991, 2, 3.
  2. Xiong, R.G.; Yu, Zh.; Liu, C.M.; You, X.Z. Polyhedron 1997, 16, 2667.
  3. Gable, R.W.; Hoskins, B.F.; Winter, G. Inorg. Chim. Acta. 1985, 96, 151.
  4. Reddy, P.Ch.; Rangamannar, B. J. Radioanal Nucl. Chem 1996, 213, 9.
  5. Reddy, P.Ch.; Rangamannar, B. J. Radioanal Nucl. Chem. 1996, 214, 159.
  6. Wolf, N.; Roundhill, D.M. Polyhedron 1994, 13, 2801.
  7. Zelmon, D.E.; Gebeyhu, Z.; Tomlin, D.C.; Thomas, M. Mater Res. Soc. Symp. Proc. 1998, 519, 395. [CrossRef]
  8. Allen, F.H. J. Chem. Soc. Perkin Trans. 1987, S1–S19. [CrossRef]
  9. Sheldrick, G.M. SHELXTL Version 2.
  • Sample Availability: Available from the authors.

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MDPI and ACS Style

Jiang, X.H.; Zhang, W.G.; Zhong, Y.; Wang, S.L. Synthesis and Structure of the Cadmium (II) Complex: [Cd(C5H5N)2(S2CO-n-C4H9)2]. Molecules 2002, 7, 549-553. https://doi.org/10.3390/70700549

AMA Style

Jiang XH, Zhang WG, Zhong Y, Wang SL. Synthesis and Structure of the Cadmium (II) Complex: [Cd(C5H5N)2(S2CO-n-C4H9)2]. Molecules. 2002; 7(7):549-553. https://doi.org/10.3390/70700549

Chicago/Turabian Style

Jiang, Xu Hong, Wei Guang Zhang, Yun Zhong, and Sue Lein Wang. 2002. "Synthesis and Structure of the Cadmium (II) Complex: [Cd(C5H5N)2(S2CO-n-C4H9)2]" Molecules 7, no. 7: 549-553. https://doi.org/10.3390/70700549

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