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The bistable cobalt complex containing two symmetrical 3,6 di tert butyl o benzoquinone and one 1,10 phenanthroline moieties as ligands (1) was synthesized. Complex 1 was isolated in the individual state and characterized by IR and ESR spectroscopy, X ray diffraction, magnetochemical studies, and precision calorimetry. A change in temperature causes the re versible metal-ligand electron transfer and spin crossover (redox isomerism) in complex 1 in the crystalline state. The redox isomeric transformation at ∼250 K is accompanied by the phase transition. The structural study at two temperatures confirmed the changes in the molecular and crystal structure associated with the redox isomeric transformation.

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