Self-assembly of 1D coordination polymers from nickel(II) tetraaza macrocycle and carboxylate ligands

Reactions of [Ni(L)]Cl2 · 2H2O (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo[14,4,01.18,07.12]docosane) with isophthalic acid (H2isoph) and 1,3,5-cyclohexanetricarboxylic acid (H3chtc) yield the 1D nickel(II) complexes {[Ni(L)(isoph)] · 3H2O}n (1) and {[Ni(L)(H-chtc)] · H2O}n (2). The structures were characterized by X-ray crystallography, spectroscopic and magnetic susceptibility. The crystal structures of the 1D chain compounds 1 and 2 show an elongated distorted octahedron about each nickel(II) ion. The magnetic behavior of two compounds exhibits weak intrachain antiferromagnetic interaction with J values of −0.93 cm−1 for 1 and −1.28 cm−1 for 2. The electronic spectra of the complexes are significantly affected by the nature of the carboxylate ligands.

1D nickel(II) complexes {[Ni(L)(isoph)] · 3H2O}n (1) and {[Ni(L)(H-chtc)] · H2O}n (2) were synthesized and structurally characterized. The crystal structure of the 1D chain compounds 1 and 2 exhibits a weak antiferromagentic interaction and shows an elongated distorted octahedron about each nickel(II) ion.Figure optionsDownload as PowerPoint slide