Ion Pair Charge Transfer as a Particular Effect of Second-Sphere Coordination

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Abstract
The interest in dealing with the classical phenomenon of second-sphere coordination has developed again during the past few years. This is due to some unusual chemical and physical properties caused by outer-sphere effects. Ion pair associates consisting of ionic Werner-type complexes and appropriate counter-ions are diverse representatives of second-sphere coordination. Such ion-pair compounds are of particular interest which are distinguished by spectroscopic ion pair charge transfer (IPCT) transitions. The spectroscopic and photochemical behavior of IPCT compounds, as well as a novel increment system for the prediction of the energy of optical IPCT transitions, are discussed in this Comment.