Crystal structure of poly[(μ6-benzene-1,3,5-tricarboxylato)tris(1-methylpyrrolidin-2-one)nitratodizinc(II)

Abstract

The asymmetric unit of the title compound, [Zn2(C9H3O6)(NO3)(C5H9NO)3] n , I, consists of two different zinc(II) ions bridged by the carboxylate group of benzene-1,3,5-tricarboxylate (BTC3−). The Zn1 center is tetra-coordinated by the carboxylate O atoms of three symmetrically equivalent BTC3− anions and one nitrate O atom in a distorted tetrahedral geometry with Zn—Ocarboxylate bond lengths (average value 1.958 Å) slightly shorter than the Zn—Onitrate distance [2.013 (6) Å]. The Zn2 center is hexa-coordinated by three O atoms from the carboxylic groups of different BTC3− linkers and three O atoms of 1-methylpyrrolidin-2-one (NMP) in a slightly distorted octahedral geometry with nearly equivalent Zn—O bond lengths (average values of 2.091 and 2.088 Å, respectively). Linking of the paddle-wheel dizinc building units by the three carboxylate groups of the BTC3− molecule results in the formation of the three-dimensional coordination framework.