Different dimensional and structural variations in coordination polymers of d(10) metal ions constructed from a benzimidazole based carboxylate linker

作者：Mishra Rupali; Ahmad Musheer; Tripathi Madhav Ram^*

来源：Polyhedron, 2013, 50(1): 22-30.

DOI：10.1016/j.poly.2012.09.062

• Coordination polymer
• d(10) Metal ions
• Synthesis
• X-ray structural studies
• Crystal structure
• TGA

Six new coordination polymers, {[Zn(L)(2)]center dot(DMF)center dot(H2O)}(n) (1), [Zn(L)2](n) (2), [Cd-2(L)(4)](n) (3), {[Cd(L)(HL) Cl]center dot(H2O)}(n) (4), {[Cd(L)(Cl)(DMF)]center dot(DMF)}(n) (5) and [Cd(L)(2)(H2O)(2)](n) (6), where HL = 4-benzimidazole-1-yl-benzoic acid and DMF = N,N'-dimethylformamide, have been synthesized with d(10) metal ions under different hydro/solvothermal conditions. The polymers have been characterized by IR spectroscopy, elemental, thermogravimetric analyses (TGA) and powder X-ray diffraction (PXRD), and their structures have been determined by single-crystal X-ray diffraction analyses. Structural studies reveal that both 1 and 2 are 2D coordination polymers. The structure of 1 shows a 2-fold interpenetrated (4,4) net topology, while that of 2 is composed of infinite carboxylate-bridged Zn(II) chains running along the crystallo-graphic a-axis. When the ligand HL is treated with cadmium nitrate, 3 and 6 are formed under hydrothermal and solvothermal conditions respectively. Compound 3 has a 3D structure having infinite carboxylate-bridged Cd(II) chains while 6 is a 1D coordination polymer. However, when a chloride salt of Cd(II) is used, compounds 4 and 5 are obtained, which contain chloride-bridged Cd(II) dimers which are further bonded to the ligand to form 1D chains. Thus, depending upon the nature of the counter-anion or the reaction conditions, a variety of 1D, 2D and 3D coordination polymers of Zn(II) and Cd(II) are formed.

• 出版日期2013-2-13