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The Potentiality of Chromium(III)‐Polypyridyl Complexes Toward Use in Photochemical Solar Energy Conversion
Author(s) -
Hoffman Morton Z.,
Serpone Nick
Publication year - 1982
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198200019
Subject(s) - intersystem crossing , chemistry , excited state , photochemistry , quenching (fluorescence) , chromium , redox , triplet state , ground state , atomic physics , fluorescence , inorganic chemistry , physics , organic chemistry , singlet state , quantum mechanics
The properties of polypyridyl complexes of Cr(III), Cr(NN) 3+ 3 , are examined with regard to the photochemical determinants of efficient solar energy utilization and compared with those of corresponding complexes of Ru(II), Fe(II), Os(II), Rh(III), and Ir(III). The following characteristics are discussed: absorption spectra, nature and lifetimes of excited states, intersystem crossing efficiency between lowest spin‐allowed and spin‐forbidden excited states, energetics and kinetics of excited‐state redox quenching, and the properties of redox‐generated energy‐rich charge‐carriers. Recent results dealing with the effect of solution medium on intersystem crossing efficiency and excited‐state lifetimes are presented. Cr(NN) 3+ 3 complexes have been applied to solar energy conversion schemes and a brief review and critique are offered. The advantages and disadvantages of Cr(NN) 3+ 3 as solar energy harvesters and electron‐transfer mediators are discussed in terms of future research directions.