Evidence for static localization in the lowest optically excited states of ruthenium(II) diimine complexes: a solvent- and time-dependent photoselection study at 77 K

Autor:	Michael L. Myrick, R. L. Blakley, M. K. Dearmond, M. L. Arthur
Rok vydání:	1988
Předmět:	chemistry.chemical_classification Quinoline chemistry.chemical_element General Chemistry Photochemistry Biochemistry Catalysis Ruthenium chemistry.chemical_compound Bipyridine Crystallography Colloid and Surface Chemistry chemistry Excited state Pyridine Solvent effects Inorganic compound Diimine
Zdroj:	Scopus-Elsevier
ISSN:	1520-5126 0002-7863
Popis:	The 77 K absorption, emission, steady-state excitation photoselection (SSExP), and time-resolved excitation photoselection (TRExP) results are reported for 11 (Ru(L)/sub 3/)(PF/sub 6/)/sub 2/ complexes with 2,2'-diimine ligands (L). The ligands are 2,2'-bipyridine (bpy), 1,10-phenanthroline (phen), 2,2'-bipyrazine (bpz), 2-(2-pyridyl)quinoline (pq), and 2,2'-biquinoline (biq). Complexes of the form (Ru(L)/sub 3/)/sup 2 +/ (L = bpy, phen, bpz, pq, and biq) were examined as well as mixed-ligand complexes of the form (Ru(bpy)/sub n/(L)/sub 3-n/)/sup 2 +/ (n = 1, 2) (L = phen, bpz, and pq). Data are also presented for the monomeric model complex, (Ru(bpy)(py)/sub 4/)/sup 2 +/ (py = pyridine). Data indicate that optical excitation leads to static localization of the optically excited electron. A model is developed that rationalizes the maximum value obtainable in the SSExP data. Solvent effects observed in the TRExP data are explained in terms of relative rates of spin-lattice relaxation associated with different solvents.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca8e1b316ce5f7de85d45dc9adb18a8e https://doi.org/10.1021/ja00213a001 Zobrazit plný text záznamu