Polytetra-n-butyl­ammonium (μ5-benzene-135-tricarboxyl­ato)(μ4-benzene-135-tricarboxyl­ato)-μ3-hydroxido-trizincate 0.25-hydrate

摘要

In the asymmetric unit of title coordination polymer, {(C16H36N)[Zn3(C9H3O6)2(OH)]·0.25H2O}n, there are three independent Zn²⁺ cations, two benzene-1,3,5-tricarboxyl­ate ligands and a μ3-bridging hydroxide group, together with a tetra-n-butyl­ammonium counter-cation and a partially occupied water molecule of solvation (occupancy 0.25). Each Zn ion is coordinated by three carboxyl­ate O atoms and one O atom from the bridging hydroxide ion, displaying a slightly distorted tetra­hedral stereochemistry [overall Zn—O range = 1.875 (3)–1.987 (2) Å]. An intra­molecular hydrogen bond involving the hydroxide H atom and a carboxyl­ate O-atom acceptor is also present in the complex unit. The bridging benzene-1,3,5-tricarboxyl­ate anions generate a three-dimensional framework structure.