The Effects Of Pressure On Valence Tautomeric Transitions Of Dinuclear Cobalt Complexes

摘要

The effects of pressure on valence trautomeric transition behavior of two complexes, [{Co(tpa)}_2(dhbq)]·(PF_6)_3 (I·(PF_6)_3) and [{Co(dpqa)}_2(dhbq)](PF_6)_3(II·(PF_6)_3)(tpa = tris(2-pyridylmethyl)-amine, dpqa = di(2-pyridylmethyl)-N-(quinolin-2-ylmethyl)-amine and dhbq = deprotonated 2,5-dihydroxy-l,4-benzoquinone), in the light of changes of magnetic susceptibilities were investigated; the results show that external pressure makes the SC + ET transition process of the two complexes into a general SC process only.rnMolecule-based magnetic materials with bistable electronic states that can be controlled by external parameters have been attracting great attention because of their potential applications. Among such materials, spin crossover (SC) and valence tautomeric (VT) complexes are the most important series that have been extensively studied, as both of them can be stable at different electronic states under certain conditions, and the interconversion between these electronic states are usually able to be affected by physical stimuli such as heat, light or pressure.