About: 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     Goto   Sponge   NotDistinct   Permalink

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Description
  • 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.
  • 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)
  • Tppz [2,3,5,6-tetrakis(2-pyridyl)pyrazinem]-přemostěné komplexy [{(L)ClRu}(2)(mu-tppz)](n+) se strukturálně podobnými ale elektronicky různými doplňkovými ligandy, 2-(2-pyridyl)azoly (L), byly syntetizovány jak diruthenium(II) částice. Cyklická voltametrie, EPR paramagnetických stavů, a UV-VIS-NIR spektroelektrochemie ukázaly, že první dva redukční procesy probíhají na tppz můstku a oxidace zahrnuje hlavně kovová centra. Meziprodukty se smíšeným valenčním stavem po jednoelektronové oxidaci vykazují střední komproporcionační konstanty 10(4) < K-c < 10(5), ale jeví se jako valenčně vyrovnané dle Hushova kritéria. Redox potenciály, EPR, a UV-VIS-NIR výsledky ukazují účinek rostoucí donorové síly koncových ligandů ve sledu L-1 < L-2 < L-4 mnohem méně než L-3, L-1 = 2-(2-pyridyl)benzoxazol, L-2 = 2-(2-pyridyl)benzthiazol, L-3 = 2-(2-pyridyl)benzimidazolát, L-4 = 1-methyl-2-(2-pyridyl)-1H-benzimidazol (cs)
Title
  • 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)
  • Aspekty smíšené valence u dirutheniových komplexů [{(L)ClRu}2(.mu.-tppz)]n+. spojujících 2-(2-Pyridyl)azoly (L ) jakožto koncové funkční skupiny a 2,3,5,6-Tetrakis(2-pyridyl)pyrazine (Tppz ) jako bis-tridentátní můstkový ligand (cs)
skos:prefLabel
  • 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)
  • Aspekty smíšené valence u dirutheniových komplexů [{(L)ClRu}2(.mu.-tppz)]n+. spojujících 2-(2-Pyridyl)azoly (L ) jakožto koncové funkční skupiny a 2,3,5,6-Tetrakis(2-pyridyl)pyrazine (Tppz ) jako bis-tridentátní můstkový ligand (cs)
skos:notation
  • RIV/61388955:_____/04:00107597!RIV/2005/AV0/A54005/N
http://linked.open.../vavai/riv/strany
  • 5128;5133
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(OC D14.20), P(OC D15.10), Z(AV0Z4040901)
http://linked.open...iv/cisloPeriodika
  • 16
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 573802
http://linked.open...ai/riv/idVysledku
  • RIV/61388955:_____/04:00107597
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • electron-transfer; ruthenium complexes; spectroelectrochemical properties (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [E1DD575860F6]
http://linked.open...i/riv/nazevZdroje
  • Inorganic Chemistry
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 43
http://linked.open...iv/tvurceVysledku
  • Fiedler, Jan
  • Kaim, W.
  • Lahiri, G. K.
  • Sarkar, B.
  • Kar, S.
  • Chanda, N.
http://linked.open...n/vavai/riv/zamer
issn
  • 0020-1669
number of pages
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