Journal
DALTON TRANSACTIONS
Volume -, Issue 11, Pages 1377-1382Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b513807h
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A novel series of valence tautomeric (VT) complexes, [Co(Cnbpy)(3,5-DTBQ)(2)] (Cnbpy = 4,4'-dialkyl-2,2'-bipyridine (alkyl = (CnH2n+1) where n = 0 (CoCObpy), 1 (CoC1bpy), 5 (CoC5bp), 9 (CoC9bpy) and 13 (CoC13bpy); 3,5-DTBQ = 315-di-tert-butylsemiquinonate or catecholate), including two previously reported complexes (CoCObpy and CoC1bpy), were systematically prepared and their properties examined. Introduction of alkyl groups into VT chromophores leads to unexpected variations in the VT process, depending on the lengths of the alkyl chains. An even more interesting observation is that significant polytypic phase transitions with crystallographic symmetry changes accompanying the abrupt VT conversion are induced for the first time in CoC9bpy and CoC13bpy.
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