Charge transfer phase transition

Thermally Induced Charge Transfer Phase Transition... 

Schematic feature of the charge transfer phase transition in (n-C3H7)4N[Fe"Fe "(dto)3]. (Reproduced from Ref. 14 with permission of Elsevier.)...

Schematic representation of the concerted phenomenon coupled with the charge transfer phase transition in [Fe"Fe" (dto)3] and the photoisomerization of spiro-pyran in (SP)[Fe"Fe" (dto)3]. White and black circles represent the Fe" and Fe " sites, respectively. (Reproduced from Ref. 34 with permission of Elsevier.)...

Much of chemistry occurs in the condensed phase solution phase ET reactions have been a major focus for theory and experiment for the last 50 years. Experiments, and quantitative theories, have probed how reaction-free energy, solvent polarity, donor-acceptor distance, bridging stmctures, solvent relaxation, and vibronic coupling influence ET kinetics. Important connections have also been drawn between optical charge transfer transitions and thennal ET. 

As might be expected, the results from both theory and experiment suggest that the solution is more than a simple spectator, and can participate in the surface physicochemical processes in a number of important ways [Cao et al., 2005]. It is well established from physical organic chemistry that the presence of a protic or polar solvent can act to stabilize charged intermediates and transition states. Most C—H, O—H, C—O, and C—C bond breaking processes that occur at the vapor/metal interface are carried out homolytically, whereas, in the presence of aqueous media, the hetero-lytic pathways tend to become more prevalent. Aqueous systems also present the opportunity for rapid proton transfer through the solution phase, which opens up other options in terms of reaction and diffusion. 

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