Abstract
Synthesis, characterization, and X-ray crystal structure for a mixed-valence binuclear Co(II)/Co(III) complex with the dianionic dithiolate form of a pentadentate ligand 2,6-diacetylpyridinebis(thiosemicarbazone) are reported. A new synthetic methodology has been employed replacing usual cobalt(II) salts by [Co(NH3)5Cl]Cl2 as a precursor. The coordination geometry of cobalt(II), CoN2S2, was found to be distorted tetrahedral, whereas the cobalt(III) coordination sphere, CoN4S2, is slightly distorted octahedral. The magnetic behavior and molar conductivity of the complex are in agreement with the mixed-valence state.
Acknowledgements
This work was supported by NIH COBRE Award P20 RR017708 from the National Center for Research Resources (D.M.E.). A.P. would like to thank Professor Pradyot Banerjee, Indian Association for the Cultivation of Science, for providing laboratory facilities and helpful discussions.