Study on the intermolecular interactions of alkylcobaloxime complexes (RCo(dmgH)(2)L, dmgH = dimethylglyoxime, R=alkyl, L=H2O or pyridine)

摘要

A series of alkylcobaloxime complexes, [RCo(dmgH)(2)L, where dmgH=dimethylglyoxime, R=alkyl, L=neutral monodentate axial ligand], i.e. (EtO2C)(2)C(Me)CH2Co(dmgH)(2)H2O(1), n-C5H11Co(dmgH)(2)H2O(2), Br(CH2)(4)Co(dmgH)(2)py(3) and Br(CH2)4Co(dmgH)(2)H2-O(4), have been synthesized and characterized. Analysis and comparison of their crystal packing structures with that of our previous reported complexes, COOCH3(CH2,)(2)Co(dmgH)(2)H2O(5) and c-C6H11Co(dmgH)(2)H2O(6), disclose that one-dimensional ribbon-like zigzag hydrogen bonded networks in 1, 2 and 4 are sustained and controlled by self-assembly between dimethylglyoxime and coordinated water through O-H center dot center dot center dot O- interactions. And the further fon-nation of different types of hydrogen bond linkages with the variation of the axial groups leads to creation of special 2D or 3D architectures. However, the crystal packing structure of 5 and 6 are absolutely different from 1, 2 and 4 due to conformational isomerism effect. Additionally, different types of the protons attachment at O-H center dot center dot center dot O- bridge are observed in 3 and 4, respectively, which is favorable to the intermolecular interactions. (c) 2005 Elsevier B.V. All rights reserved.