A unique 2D framework containing linear trimeric cobalt(ii) of mixed Td–Oh–Td geometries linked by two different single-carboxylate-aromatic amineligands: structure and magnetic properties

Abstract

A new 2D coordination polymer Co₃(OH)₂(pa)₂(ina)₂ (1, pa = 3-(1H-benzimidazol-2-yl) propanoic carboxylate, ina = isonicotinate) contained uncommon, linear Co(II) trimers of mixed T_d–O_h–T_d geometries, exhibits spin canting below 20 K. Such magnetic behavior mainly arises from the Dzyaloshinski–Moriya interaction from the anisotropic, mixed geometries trimeric Co(II) ions to the crimpled 2D network based on the nature of the binding modes of Co(II)-carboxylate trimer and the effect of the intertrimers arrangement of 1. The mixed single-carboxylate-aromatic amine ligands bridged metal systems display a new structurally authenticated example of a thick 2D layer, and also indicate homometallic Co(II) clusters with T_d–O_h–T_d mixed-geometries can result in relatively obvious noncompensation moments, according to different efficient spins of Co(II) at very low temperature, in spite of antiferromagnetic intracluster interactions.