ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Four novel cobalt(II) succinate coordination polymers with N-heterocyclic ligands: crystal structures, spectral properties, magnetism and computational study

Marek Brezovan, Vladimír Kuchtanin, Ján Moncol, Ján Pavlik, Ľubor Dlháň, and Peter Segľa

Department of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak Technical University, Bratislava, Slovakia

E-mail: peter.segla@stuba.sk

Received: 29 January 2020  Accepted: 16 May 2020

Abstract:

Four novel complexes [Co(μ₂-suc)(bzim)₂(MeOH)₂]_n (I), [Co(μ₂-suc)(bzim)₂(H₂O)₂]_n (II), [Co(μ₂-suc)(2-Mebzim)₂(H₂O)₂]_n (III) and [Co(μ₂-suc)(2-Etbzim)₂]_n (IV) (suc = succinate dianion, bzim = 1-H-benzimidazole, 2-Mebzim = 2-methyl-1-H-benzimidazole and 2-Etbzim = 2-ethyl-1-H-benzimidazole) were synthesized and characterized by elemental analysis, single-crystal structure analysis, infrared and electronic spectra and magnetic measurements. The coordination environment of the central atom is octahedral in I–III and tetrahedral geometry is documented in IV, which is relatively rare in presence of N-donating ligands. All four complexes form one-dimensional coordination polymers which are further connected by N–H⋯O and/or O–H⋯O bridges into supramolecular two-dimensional (I) or three-dimensional (II–IV) networks. The interpretation of magnetic properties of complexes II–IV was supported with the help of state-of-the-art quantum chemistry proving spin-only behaviour of tetrahedral system IV and spin–orbit interaction in II and III.

Keywords: Coordination polymer; Cobalt(II) complexes; Succinate; Magnetic properties; Ab-initio calculations

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01206-1

Chemical Papers 74 (11) 3741–3753 (2020)