Nickel(II) metal-organic frameworks with N, N'-di(4-pyridyl)-naphthalenediimide ligands: influence of secondary building unit geometry on dimensionality and framework dimensions

摘要

When Ni(NO3)(2)center dot 6H(2)O and N, N'-di(4-pyridyl)-1,4,5,8-naphthalenetetracarboxydiimide (DPNDI) are reacted, a one-dimensional coordination polymer (1) is formed. However, analogous reactions with either terephthalic acid (2) or 2,6-naphthalenedicarboxylic acid (3) and DPNDI affords two-dimensional, pillared metal-organic frameworks. 2 and 3 contain rectangular voids of different dimensions which are dictated by the carboxylate ligand and the arrangement of the {[M(k(2)-O2NO)](2)(mu(2)-O2CR)(2)} secondary building unit (SBU) that forms the nodes of the framework. The role of SBU geometry, intermolecular face-to-face pi-pi and lone pair-pi interactions involving the DPNDI ligands are discussed.