Coordination Assembly of ZnII/CdII Terephthalate with Bis-Pyridinecarboxamide Tectons: Establishing Net Entanglements from [3 + 3] Interpenetration to High-Connected Self-Penetration

Abstract

Four polymeric d10 metal terephthalate complexes incorporating bis-pyridinecarboxamide building blocks were prepared to explore the effect of the central metal ion or the fluorine substituent of the ligand on the topology and entanglement of coordination networks. The combination of ZnII terephthalate with a fluorinated ligand leads to a noninterpenetrated coordination layer with honeycomb (hcb) topology for complex 1. Interestingly, the other three materials display the unusual entangling coordination networks. For 2, the reaction of zinc terephthalate with nonfluorinated ligand affords three-dimensional diamond (dia) architecture of [3 + 3] interpenetration, while the CdII terephthalate complexes 3 and 4 with the two types of bis-pyridinecarboxamide tectons show the isostructural self-penetrating framework with unique 8-connected (417.611) topology.