Synthesis and Crystal Structure of a Mn(II) Metal-Organic Framework Based on a Polydentate Schiff Base Ligand

A Mn(II) metal-organic framework {[MnL₂(NCS)₂]·(H₂O)₄}_n (1) with L = bis(pyridin-3-yl-methylene)biphenyl-2,2′-dicarbohydrazide has been synthesized and characterized by IR spectroscopy, elemental analysis, UV spectroscopy, thermogravimetric (TG) analysis, powder X-ray diffraction, and single-crystal X-ray structure determination. The Mn(II) atom has a distorted octahedral coordination environment with an N₆ donor set from four ligands and two NCS⁻ anions. The structure of 1 exhibits a layer framework containing tetranuclear metallacyclic ring units [Mn^II₄L₄] in the chair conformation. In addition, there are multiform O–H···O, C–H···O, N–H···O, and C-H···N hydrogen bonds and C–H··· π interactions in a three-dimensional supramolecular network.