An unprecedented T4(1)4(2)5(2) water topology

Herein, a special water cluster was observed in a metal-organic framework, namely [Zn(μ-(H2O)2)(L)(BDC)]·5H2O (1, L = 2-(pyridine-4-yl)-1H-benzo[d]imidazole, H2BDC = terephthalic acid). In this ice-like water cluster, tetramer water clusters are combined together by sharing one corner to give rise to the T4(1) water structure, while the pentamer water clusters are located on two sides of this T4(1) water chain by sharing two edges with two tetramer water clusters, thus resulting in the overall T4(1)4(2)5(2) water topology.