0181782 - UFCH-W 20030222 RIV GB eng J - Článek v odborném periodiku
Chanda, N. - Sarkar, B. - Fiedler, Jan - Kaim, W. - Lahari, G. K.
Synthesis and Mixed Valence Aspects of [{(L)ClRu}(2)(mu-tppz)](n+) Incorporating 2, 2 ''-dipyridylamine (L) as Ancillary and 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz) as Bridging Ligand.
Dalton Transactions. č. 18 (2003), s. 3550-3555. ISSN 1477-9226. E-ISSN 1477-9234
Grant CEP: GA ČR GA203/03/0821; GA MŠMT OC D14.20
Výzkumný záměr: CEZ:AV0Z4040901
Klíčová slova: dinuclear ruthenium complexes * spectroelectrochemical properties * electron-transfer
Kód oboru RIV: CG - Elektrochemie
Impakt faktor: 2.908, rok: 2003

-The tppz-bridged diruthenium complex [{(L)ClRuII}(2)(mu-tppz)](ClO4)(2), [1](ClO4), {tppz=2,3,5,6-tetrakis(2-pyridyl)-pyrazine, L=2,2''-dipyridylamine} and its mononuclear counterpart [(L)ClRuII(tppz)]ClO4, [2](ClO4) have been synthesized. The 380 mV separation between successive Ru-II/Ru-III couples in [1](2+) leads to a comproportionation constant (K-c) of 2.7x10(6). Consequently, the (RuRuIII)-Ru-II species [1](3+) exhibits a rather narrow intervalence charge transfer band at 1700 run, suggesting a class III mixed-valence state, the electronic coupling constant (V-ab) is calculated at 2940 cm(-1). Complex [1](3+) displays a rhombic EPR spectrum at 4 K (g(1)=3.390, g(2)=2.278, g(3)=1.697), characteristic of ruthenium(III) in a distorted octahedral environment. Both complexes show two successive tppz-based reduction processes [(tppz)(0/-1) and (tppz)(-1/-2)].
Trvalý link: http://hdl.handle.net/11104/0078301