Abstract
Under the hydrothermal conditions, the simple self-assembly between Cd2+, 2,3,5,6-pyridinetetracarboxylic acid (L1′), and N2H4 created a L12−-based Cd2+ coordination polymer [Cd(L1)(N2H4)] · 2H2O (L12− = 2,3,5,6-pyridinetetracarboxylhydrazidate) 1. H2L1 derived from the in situ acylation of L1′ with N2H4. X-ray single-crystal diffraction analysis reveals that 1 possesses a 1-D chained structure co-bridged by L12− and N2H4, where a castellated CdO single-chain is observed. It is noteworthy that between the L12− molecules, two types of cyclic hydrogen-bonded synthons are found. Via these weak intermolecular interactions, 1 self-assembles into a 3-D porous supramolecular network (window size: 8 × 7 A2). The tetrahenuclear water clusters with a tetrahedral structure are observed in the pores.
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