Synthesis and characterization of two nicotinate-containing cadmium complexes in a tripodal ligand system

Abstract

Two nicotinate-containing cadmium(II) complexes were synthesized and structurally characterized. [Cd(ntb)(nic)]ClO 4 Á 0.5CH 3 OH (1) (ntb ¼ tris(2-benzimidazolylmethyl)amine, nic ¼ nicotinate anion) crystallized in the triclinic space group P-1 with a ¼ 13.9979 (17) The central Cd(II) is coordinated by four nitrogen atoms of ntb and two oxygen atoms of nicotinate to form a distorted octahedral geometry. [Cd(tren)(nic)]BPh 4 (2) (tren ¼ tris(2-aminoethyl) amine) crystallized in the monoclinic crystal system, P2 1 /c space group with a ¼ 18.610(6) Å , b ¼ 10.1620(16) Å , c ¼ 20.0085(18) Å and ¼ 111.230(11) . The central Cd(II) is coordinated by four nitrogen atoms of tren and one oxygen atom of nicotinate to form a distorted trigonal bipyramidal geometry. A tetramer for 1 and a dimer for 2 are formed through intermolecular hydrogen-bonding.

One- and two-dimensional CdIIcoordination polymers constructed from 2-(2-methyl-1H-benzimidazol-1-yl)acetate ligands

“…A great deal of attention has been paid to the crystal engineering of metal-organic coordination polymers in recent years, due to a conbination of their fascinating molecular structures and their potential applications as functional materials (Kahn & Martinez, 1998;Xiong et al, 2001; Liao et al, 2004). A series of cadmium coordination polymers containing carboxylate ligands have been reported (Yang et al, 2009;Zheng et al, 2012;Zhou et al, 2011;Nie & Wang, 2011;Han et al, 2012;Wang et al, 2012). According to previous reports, asymmetric bridging ligands containing carboxylic acid and nitrogen groups with a variety of properties are excellent candidates for the construction of highly connected topological frameworks.…”

Structural diversity and solid-state properties of CoII and ZnII coordination complexes with 5-aminonicotinate through metal direction

“…The Zn II in 2 takes the uncommon tetrahedral coordination different to that in previously reported complexes. Some similar ligands, such as nicotinic acid or isonicotinic acid, have also been frequently used to assemble with other metal salts, such as Ln III and Cd II salts [30,31]. Different to Co II /Zn II complexes, the carboxylates in these Ln III and Cd II complexes take various monodentate, bidentate chelating/bridging coordination modes, and the pyridine N atoms are not coordinated (the carboxyl group of 5-HAN is monodentate in 1 and uncoordinated in 2.…”

A tetranuclear cadmium(II) complex based on the 2-(quinolin-8-yloxy)acetonitrile ligand

“…A series of cadmium coordination polymers containing carboxylate ligands has been reported (Yang et al, 2009;Zhou et al, 2011;Nie & Wang, 2011;Han et al, 2012;Wang et al, 2012) and, compared with the abovementioned cases, seven-coordinated complexes crystallizing in noncentrosymmetric space groups are rare. We report here the synthesis and crystal structure of an acentric seven-coordinated tetranuclear cadmium coordination compound tetrakis[-2-(quinolin-8-yloxy)acetato]tetrakis[-2-(quinolin-8-yloxy)acetonitrile]tetracadmium tetrakis(perchlorate) dihydrate, (I).…”