Flash-quench technique employed to study the one-electron reduction of triiodide in acetonitrile: evidence for a diiodide reaction product |
| |
Authors: | Farnum Byron H Gardner James M Meyer Gerald J |
| |
Institution: | Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, USA. |
| |
Abstract: | The one-electron reduction of triiodide (I(3)(-)) by a reduced ruthenium polypyridyl compound was studied in an acetonitrile solution with the flash-quench technique. Reductive quenching of the metal-to-ligand charge-transfer excited state of Ru(II)(deeb)(3)](2+) by iodide generated the reduced ruthenium compound Ru(II)(deeb(-))(deeb)(2)](+) and diiodide (I(2)(?-)). The subsequent reaction of Ru(II)(deeb(-))(deeb)(2)](+) with I(3)(-) indicated that I(2)(?-) was a product that appeared with a second-order rate constant of (5.1 ± 0.2) × 10(9) M(-1) s(-1). After correction for diffusion and some assumptions, Marcus theory predicted a formal potential of -0.58 V (vs SCE) for the one-electron reduction of I(3)(-). The relevance of this reaction to solar energy conversion is discussed. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|