Functional Self-Assembly of Hydrogen-Bonded 3D Coordination Networks Constructed from 1,2,4,5-Benzenetetracarboxylic Acid

摘要

Hydrothermal synthesis, characterization (IR, TG/DTA, element analysis, inductively coupled plasma (ICP)) and single-crystal X-ray structures of H4Btec hydrate and its two cobalt complexes, colorless [H4Btec · 2H2O]_n (I), pink [Co(H2O)6(H2Btec)]_n (II), and nacarat {[Co(H2O)3(H2Btec)(Phen)] · H2O}_n (III) (H4Btec = 1,2,4,5-benzenetetracarboxylic acid, Phen = 1,10-phenanthroline) have been solved. The results showed that I forms a 3D O-H···O hydrogen-bonded network generated from H4Btec and water molecules, II presents a 3D network constructed by mononuclear [Co(H2O)6]~(2+) cations and H2Btec~(2-) dianions through extensive hydrogen-bonding interactions, and III gives rise to a pseudo-octahedral coordination geometry. Extensive hydrogen-bonding interactions have significant effects in configuring a 3D network constructed by mononuclear [Co(H2Btec)(Phen)(H2O)3] neutral molecules and a water molecules.