Coordination Polymeric Assemblies of some d‐Block Elements with Schiff Bases and its Characterization

Abstract

A few coordination chain polymeric assemblies of the type [M(SB)(H 2 O) 2 ] n [M ¼ Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II), H 2 SB 1 ¼ 1,1 0 -dihydroxy-2,2 0 -(1-isonitriloethylidyne -4-nitrilomethylidenephenyl)diphenyl or H 2 SB 2 ¼ 1-thio-1 0 -hydroxy-2,2 0 -(1-isonitriloethylidyne-4-nitrilomethylidenephenyl)diphenyl have been investigated. Structural and spectroscopic properties have been studied on the basis of elemental analyses, infrared spectra, 1 H-NMR, 13 C-NMR, electronic spectra, magnetic measurements and thermogravimetric analyses. The Schiff bases act as binegative tetradentate ligands and bonding occur through the nitrogen and oxygen or sulfur atoms. An octahedral geometry has been assigned to all the prepared coordination polymers. The coordination polymers are insoluble in common organic solvents like benzene, acetone, ethyl acetate, methanol, ethanol, chloroform, dimethyl formamide and dimethyl sulphoxide.

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“…The spectrum of the ligand (L) showed a singlet signal at 2.3 ppm for the CH3 group, A doublet signal at 4.66 ppm appeared for C-H group while singlet signal at 7.91 ppm for the O-H group. While for the aromatic group appeared as a multiplet in the range 6.88-7.91 ppm protons [26]. singlet signal at 13.9 ppm for the S-H group.…”