. "5128;5133" . . "Mixed Valence Aspects of Diruthenium Complexes [{(L)ClRu}2(.mu.-tppz)]n+ Incorporating 2-(2-Pyridyl)azoles (L) as Ancillary Functions and 2,3,5,6-Tetrakis(2-pyridyl)pyrazine (Tppz) as Bis-Tridentate Bridging Ligand" . "Tppz [2,3,5,6-tetrakis(2-pyridyl)pyrazinem]-p\u0159emost\u011Bn\u00E9 komplexy [{(L)ClRu}(2)(mu-tppz)](n+) se struktur\u00E1ln\u011B podobn\u00FDmi ale elektronicky r\u016Fzn\u00FDmi dopl\u0148kov\u00FDmi ligandy, 2-(2-pyridyl)azoly (L), byly syntetizov\u00E1ny jak diruthenium(II) \u010D\u00E1stice. Cyklick\u00E1 voltametrie, EPR paramagnetick\u00FDch stav\u016F, a UV-VIS-NIR spektroelektrochemie uk\u00E1zaly, \u017Ee prvn\u00ED dva reduk\u010Dn\u00ED procesy prob\u00EDhaj\u00ED na tppz m\u016Fstku a oxidace zahrnuje hlavn\u011B kovov\u00E1 centra. Meziprodukty se sm\u00ED\u0161en\u00FDm valen\u010Dn\u00EDm stavem po jednoelektronov\u00E9 oxidaci vykazuj\u00ED st\u0159edn\u00ED komproporciona\u010Dn\u00ED konstanty 10(4) < K-c < 10(5), ale jev\u00ED se jako valen\u010Dn\u011B vyrovnan\u00E9 dle Hushova krit\u00E9ria. Redox potenci\u00E1ly, EPR, a UV-VIS-NIR v\u00FDsledky ukazuj\u00ED \u00FA\u010Dinek rostouc\u00ED donorov\u00E9 s\u00EDly koncov\u00FDch ligand\u016F ve sledu L-1 < L-2 < L-4 mnohem m\u00E9n\u011B ne\u017E L-3, L-1 = 2-(2-pyridyl)benzoxazol, L-2 = 2-(2-pyridyl)benzthiazol, L-3 = 2-(2-pyridyl)benzimidazol\u00E1t, L-4 = 1-methyl-2-(2-pyridyl)-1H-benzimidazol"@cs . "P(OC D14.20), P(OC D15.10), Z(AV0Z4040901)" . "1"^^ . "Chanda, N." . "6"^^ . "RIV/61388955:_____/04:00107597!RIV/2005/AV0/A54005/N" . "Sarkar, B." . . "Mixed Valence Aspects of Diruthenium Complexes [{(L)ClRu}2(.mu.-tppz)]n+ Incorporating 2-(2-Pyridyl)azoles (L) as Ancillary Functions and 2,3,5,6-Tetrakis(2-pyridyl)pyrazine (Tppz) as Bis-Tridentate Bridging Ligand" . . . "Mixed Valence Aspects of Diruthenium Complexes [{(L)ClRu}2(.mu.-tppz)]n+ Incorporating 2-(2-Pyridyl)azoles (L) as Ancillary Functions and 2,3,5,6-Tetrakis(2-pyridyl)pyrazine (Tppz) as Bis-Tridentate Bridging Ligand"@en . "Fiedler, Jan" . "Aspekty sm\u00ED\u0161en\u00E9 valence u dirutheniov\u00FDch komplex\u016F [{(L)ClRu}2(.mu.-tppz)]n+. spojuj\u00EDc\u00EDch 2-(2-Pyridyl)azoly (L ) jako\u017Eto koncov\u00E9 funk\u010Dn\u00ED skupiny a 2,3,5,6-Tetrakis(2-pyridyl)pyrazine (Tppz ) jako bis-trident\u00E1tn\u00ED m\u016Fstkov\u00FD ligand"@cs . . "6"^^ . "573802" . "Tppz [2,3,5,6-tetrakis(2-pyridyl)pyrazine]-bridged complexes [{(L)ClRu}(2)(mu-tppz)](n+) with structurally similar but electronically different ancillary ligands, 2-(2-pyridyl)azoles (L), were synthesized as diruthenium(II) species. Cyclic voltammetry, EPR of paramagnetic states, and UV-vis-NIR spectroelectrochemistry show that the first two reduction processes occur at the tppz bridge and that oxidation involves mainly the metal centers. The mixed valent intermediates from one-electron oxidation exhibit moderate comproportionation constants 10(4) < K-c < 10(5) but appear to be valence-averaged according to the Hush criterion. Redox potentials, EPR, and UV-vis-NIR results show the effect of increasing donor strength of the ancillary ligands along the sequence L-1 < L-2 < L-4 much less than L-3, L-1 = 2-(2-pyridyl)benzoxazole, L-2 = 2-(2-pyridyl)benzthiazole, L-3 = 2-(2-pyridyl)benzimidazolate, L-4 = 1-methyl-2-(2-pyridyl)-1H-benzimidazole." . "Kaim, W." . "Lahiri, G. K." . . . "Inorganic Chemistry" . "43" . . "Kar, S." . . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "16" . . . "0020-1669" . "RIV/61388955:_____/04:00107597" . "electron-transfer; ruthenium complexes; spectroelectrochemical properties"@en . . . "Mixed Valence Aspects of Diruthenium Complexes [{(L)ClRu}2(.mu.-tppz)]n+ Incorporating 2-(2-Pyridyl)azoles (L) as Ancillary Functions and 2,3,5,6-Tetrakis(2-pyridyl)pyrazine (Tppz) as Bis-Tridentate Bridging Ligand"@en . . . "[E1DD575860F6]" . "Tppz [2,3,5,6-tetrakis(2-pyridyl)pyrazine]-bridged complexes [{(L)ClRu}(2)(mu-tppz)](n+) with structurally similar but electronically different ancillary ligands, 2-(2-pyridyl)azoles (L), were synthesized as diruthenium(II) species. Cyclic voltammetry, EPR of paramagnetic states, and UV-vis-NIR spectroelectrochemistry show that the first two reduction processes occur at the tppz bridge and that oxidation involves mainly the metal centers. The mixed valent intermediates from one-electron oxidation exhibit moderate comproportionation constants 10(4) < K-c < 10(5) but appear to be valence-averaged according to the Hush criterion. Redox potentials, EPR, and UV-vis-NIR results show the effect of increasing donor strength of the ancillary ligands along the sequence L-1 < L-2 < L-4 much less than L-3, L-1 = 2-(2-pyridyl)benzoxazole, L-2 = 2-(2-pyridyl)benzthiazole, L-3 = 2-(2-pyridyl)benzimidazolate, L-4 = 1-methyl-2-(2-pyridyl)-1H-benzimidazole."@en . . "Aspekty sm\u00ED\u0161en\u00E9 valence u dirutheniov\u00FDch komplex\u016F [{(L)ClRu}2(.mu.-tppz)]n+. spojuj\u00EDc\u00EDch 2-(2-Pyridyl)azoly (L ) jako\u017Eto koncov\u00E9 funk\u010Dn\u00ED skupiny a 2,3,5,6-Tetrakis(2-pyridyl)pyrazine (Tppz ) jako bis-trident\u00E1tn\u00ED m\u016Fstkov\u00FD ligand"@cs . .