Photochemistry and Photophysics of Coordination Compounds

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Top Curr Chem (2007) 280: 37–67 DOI 10.1007/128_2007_141 © Springer-Verlag Berlin Heidelberg Published online: 11 July 2007 Photochemistry and Photophysics of Coordination Compounds: Chromium Noel A. P. Kane-Maguire Department of Chemistry, Furman University, 3300 Poinsett Highway, Greenville, SC 29613, USA noel.kane-maguire@furman.edu 1 Introduction ................................... 38 2 State Energy Levels and General Excited State Behavior ........... 38 3 Ultrafast Dynamics of Cr(III) Ligand Field Excited States ......... 41 3.1 Ultrafast Dynamics of 2 Eg State Formation in Cr(acac)3 ........... 42 4 Photosubstitution Studies ........................... 43 4.1 [Cr(phen)3] 3+ Photoracemization/Hydrolysis................. 43 4.2 Axial Ligand Photodissociation in Cr(III) Porphyrins ............ 45 5 Thermally Activated 2 Eg Excited State Relaxation Studies of Sterically Constrained Systems ....................... 47 5.1 [Cr(sen)] 3+ and [Cr[18]aneN6] 3+ ....................... 49 5.1.1 [Cr(sen)3] 3+ ................................... 49 5.1.2 [Cr[18]aneN6] 3+ ................................. 50 5.2 trans-[Cr(N4)(CN)2] + (where N4 = cyclam, 1,11-C3-cyclam, and 1,4-C2-cyclam).......... 51 6 Energy Transfer Studies ............................ 52 6.1 Self-Exchange Energy Transfer Between Identical Chromophores . . . . . . 53 7 Photoredox Behavior of [Cr(diimine)3] 3+ Systems .............. 54 7.1 DNAInteractions ................................ 56 8 Photoredox Involving Coordinated Ligands ................. 59 8.1 Photolabilization of NO from Cr(III)-Coordinated Nitrite . . . ....... 59 8.2 Photogeneration of Nitrido Complexes from Cr(III) Coordinated Azide . . 61 9 Final Comments ................................. 62 References ....................................... 63 Abstract The study of the photochemistry and photophysics of octahedral and pseudooctahedral Cr(III) complexes has a rich history. An initial discussion is devoted to a general appraisal of the state of these two subjects up to December 1998, after providing a framework of state energy levels and radiative and non-radiative relaxation processes relevant to Cr(III) systems. The remaining sections cover some of the more active areas in the Cr(III) field, such as ultrafast dynamics, photosubstitution, thermally activated
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Subject Index Alkyne bridges 148 An
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Subject Index 273 Rh(III) cyclometa
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Photochemistry and Photophysics of Coordination Compounds

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