A Three-Dimensional Pentanuclear Co(II) Coordination Polymer: Structural Topology, Hirshfeld Surface Analysis and Magnetic Properties

Abstract

A 3D pentanuclear coordination polymer of Co(II); {[Co5(L2-)4(HL-)2(bpmp)2 (H2O)2].(H2O)5}n (CP1) was synthesized by the self-assembly of semi-flexible 5-benzylamino-isophthalic acid (H2L) and N-donor auxiliary ligand 1,4-bis(4-pyridinylmethyl)piperazine (bpmp) using Co(NO3)2 ⋅ 6H2O under hydrothermal condition. The CP1 has been structurally characterized by elemental analysis, TGA, Powder-XRD and IR spectroscopy which was further corroborated by single crystal X-ray studies. Structurally, it is a 3D pentanuclear cobalt cluster secondary building units (SBUs) which are formed by carboxylates oxygen of H2L and nitrogen of bpmp. The topological analysis revealed that CP1 possesses a 2-nodal 5,6-connected three-dimensional (3D) coordination framework with pcu net. Variable temperature magnetic measurements demonstrate that CP1 shows antiferromagnetic behavior.