Coordination driven self-assembly in Co (II) coordination polymers displaying unprecedented topology, water cluster, chirality, and spin-canted magnetic behavior

S Ganguly, R Mondal - Crystal Growth & Design, 2015 - ACS Publications
Crystal Growth & Design, 2015ACS Publications
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 …
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 [{Co22O)(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.
ACS Publications
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