Abstract
The present work reports facile synthesis, full characterization, and architectural diversity of seven Co(II) coordination polymers, namely, [{Co(H2MBP)2(12-CDA)}·CH3OH]∞ (1), [{Co(H2MBP)(12-CDA)(H2O)}]∞ (2), [{Co0.5(H2MBP)(14-CDA)0.5}·(H2O)2.5]∞ (3), [{Co(H2MBP)(14-CDA)(H2O)2}]∞ (4), [{Co(H2MBP)(13-ADA)0.5}]∞ (5), [{Co(H2MBP)2(135-CTA)(H2O)}(H2O)3.5]∞ (6), and [{Co2(μ2O)(H2MBP)3(1245-CHA)}(H2O)12]∞ (7), derived from a 4,4′-methylene bispyrazole (H2MBP) ligand and various flexible dicarboxylate coligands. The type of alicyclic flexible carboxylate coligand used in the synthesis and its coordination to the metal center play a key role in controlling the dimensionality and topology of the frameworks. Topological analysis of the simplified nets reveals that 1 and 3 possess a 4-connected sql topology, 2 features a 3-connected uninodal hcb topology, 5 contains a 3D cds topology, and 7 possesses an unprecedented new 3D topology. Interestingly, a well-resolved 1D water chain is found within 3 and the presence of a heptanuclear water cluster assisted via a free carboxylate group is observed in 6. Chirality associated with 5 has been supported by solid-state CD spectra, and variable-temperature magnetic studies indicate that 7 exhibits canted magnetic coupling between the carboxylate bridged Co(II) ions.
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