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Organic photochromism (IUPAC Technical Report)
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2001
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General IntroductionOrganic CompoundsOptical MaterialsEngineeringPhotochromismPhotochemistryBiochemistryMechanistic PhotochemistryPhototoxicityOrganic ChemistryChemistryPhotosensitizersPhotosynthesisPhotophysical PropertyBiophysicsOrganic PhotochromismHealth Sciences
Organic photochromism is introduced as a field of study. Photochromism is defined, including related chromisms, key concepts such as two‑photon and dual‑mode PC, fatigue, and main parameters, and the main families and reaction types are illustrated. Applications include optical power limiting, photoresponsive materials, and photoswitchable biomaterials.
Abstract This technical report is a general introduction to organic photochromism. The definition of photochromism (PC) is given together with that of words with the ending "chromism", such as thermo-, electro-, piezo-, and tribochromism. Important concepts such as two-photon, gated, dual-mode PC and chirochromism are illustrated. The concept of fatigue (chemical degradation) and the determination of the main photochromic parameters (number of cycles, cyclability, half-life), and the spectrokinetic and mechanistic aspects are discussed. The main families of PC (organic compounds and biological receptors) are illustrated with chemical formulae, and the different types of reactions involved in the photochromic processes (pericyclic reactions, E / Z isomerization, group transfer, etc.) are listed. Some examples of applications to "optical power limiting" substances, photoresponsive materials, and photoswitchable biomaterials are considered.