Crystal Structure and Characterization of a New Eight Coordinated Cadmium Complex

Abstract

ABSTRACT. In this work, a new cadmium complex [Cd(L)(CH3COO)2].2H2O (1) with the ligand L, N,N´-bis(2-pyridinecarboxalidene)-1,2-cyclohexanediamine was prepared and identified by elemental analysis, FT-IR, Raman, 1 H NMR spectroscopy and single-crystal X-ray diffraction. The cadmium atom in the crystal structure of 1 has distorted triangular dodecahedral geometry by coordination of the four nitrogen atoms of L and four oxygen atoms of the two acetate ions. Two water molecules are also incorporated in the crystal network. The O-H···O hydrogen bonds present in the crystal structure of 1. In this work, three structural surveys including coordination numbers of the cadmium atom, coordination modes of L and resonance in pyridine-2-ylmethanimine-based compounds are presented.

Theoretical and experimental investigation of anticancer activities of an acyclic and symmetrical compartmental Schiff base ligand and its Co(ii), Cu(ii) and Zn(ii) complexes

“…In monodentate complexes, D values are much greater than the acetate salt (164 cm À1 ) while in bidentate complexes these values are signicantly less than the acetate salt. 64,65 The D value for 2 is 312 cm À1 suggests pseudo-monodentate coordination, which is consistent with the literature structure. 66 To interpret the NMR spectra, some carbon atoms of the ligands are marked in Scheme 1.…”

Synthesis, characterization, crystal structure and DNA-binding study of four cadmium(II) pyridine-carboxamide complexes

“…The Cd atom exhibits a distorted dodecahedron environment with Cd-O(L 2 ) and the Cd-N bond distances are slightly shorter (mean 2.357 Å) than those measured in 1a, likely for the lower bulkiness of nitrates, which present an unsymmetrical coordination. 24,25 having coordination bond distance values in agreement with those reported herein. In the crystal lattice, the monomeric units form a 2D polymeric layered supramolecular stucture parallel to the crystallographic bc plane through intermolecular hydrogen bonds between the carboxamide N-H fragments and nitrate anions (Figure 3).…”

2D-Coordination polymer containing lead(II) in a hemidirected PbO4S3 environment formed by molecular breaking of the 1,3-oxathiolane ligand

“…The differences between the asymmetric (ν as ) and the symmetric (ν s ) stretching of the acetate group (∆) can reveal its coordination type. Compared to the value for the acetate salt, monodentate complexes exhibit much larger ∆ values (164 cm −1 ), whilst in bidentate complexes these values are significantly lower than this [34,35]. The ∆ value for 1 is 133 cm −1 , which corresponds to bidentate acetate coordination.…”