Solvent effects on valence tautomerism: A comparison between the interconversion in solution and solid state

A detailed comparative study of the valence tautomeric interconversion of complexes 1–3 in three different environments is reported. The three environments are solid state (both crystalline and amorphous materials), solution and embedded into a polymeric matrix. The VT behavior of the three complexes strongly differs from one to the other, though no systematization can be established. In solution, different solvatational parameters seem to affect the equilibrium. However, such solvate effect cannot be translated either into the solid state or polymeric matrix, where the equilibrium is controlled by the vibrational relaxation of the network.

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