Coupling between polypyridineruthenium(II) and methylviologen moieties in p-conjugated hybrid systems
W. Kaim, und W. Matheis. Chemische Berichte, 123 (6):
1323--1325(1990)
Zusammenfassung
Ru(bpy)2L2+ (L = bipyrimidine, bipyrazine; bpy = 2,2'-bipyridine) reacted with OR3+ (R = Me, Et) to give Ru(bpy)2L14+ (L1 = N',N'-dialkyl L derivs.). Cyclic voltammetry of Ru(bpy)2L14+ indicated 2 reversible redn. steps and 1 irreversible oxidn. step for the bipyrimidine deriv. and 1 reversible redn. step and 1 irreversible redn. and oxidn. step for the bipyrazine complex. Ru(bpy)2L14+ were characterized by electronic absorption and ESR spectra. Incorporation into a common p system results in strong electronic coupling between the 4,4'-bipyridinium and the tris(a-diimine) chelate functions with significantly altered spectroscopic properties. The isomeric complexes with 4,4'-diquaternized 2,2'-bipyrazine ligands exhibit smaller electronic coupling and irreversible second redn. to a non-Kekule system which helps to understand the superior photosensitizing properties of 2,2'-bipyrazine complexes. on SciFinder(R)
%0 Journal Article
%1 Kaim.1990d
%A Kaim, Wolfgang
%A Matheis, Walter.
%D 1990
%J Chemische Berichte
%K bipyrazine bipyrazine;ruthenium bipyridine bipyrimidine complex cyclic quaternized ruthenium voltammetry
%N 6
%P 1323--1325
%T Coupling between polypyridineruthenium(II) and methylviologen moieties in p-conjugated hybrid systems
%V 123
%X Ru(bpy)2L2+ (L = bipyrimidine, bipyrazine; bpy = 2,2'-bipyridine) reacted with OR3+ (R = Me, Et) to give Ru(bpy)2L14+ (L1 = N',N'-dialkyl L derivs.). Cyclic voltammetry of Ru(bpy)2L14+ indicated 2 reversible redn. steps and 1 irreversible oxidn. step for the bipyrimidine deriv. and 1 reversible redn. step and 1 irreversible redn. and oxidn. step for the bipyrazine complex. Ru(bpy)2L14+ were characterized by electronic absorption and ESR spectra. Incorporation into a common p system results in strong electronic coupling between the 4,4'-bipyridinium and the tris(a-diimine) chelate functions with significantly altered spectroscopic properties. The isomeric complexes with 4,4'-diquaternized 2,2'-bipyrazine ligands exhibit smaller electronic coupling and irreversible second redn. to a non-Kekule system which helps to understand the superior photosensitizing properties of 2,2'-bipyrazine complexes. on SciFinder(R)
@article{Kaim.1990d,
abstract = {[Ru(bpy)2L]2+ (L = bipyrimidine, bipyrazine; bpy = 2,2'-bipyridine) reacted with OR3+ (R = Me, Et) to give [Ru(bpy)2L1]4+ (L1 = N',N'-dialkyl L derivs.). Cyclic voltammetry of [Ru(bpy)2L1]4+ indicated 2 reversible redn. steps and 1 irreversible oxidn. step for the bipyrimidine deriv. and 1 reversible redn. step and 1 irreversible redn. and oxidn. step for the bipyrazine complex. [Ru(bpy)2L1]4+ were characterized by electronic absorption and ESR spectra. Incorporation into a common \textgreek{p} system results in strong electronic coupling between the 4,4'-bipyridinium and the tris(\textgreek{a}-diimine) chelate functions with significantly altered spectroscopic properties. The isomeric complexes with 4,4'-diquaternized 2,2'-bipyrazine ligands exhibit smaller electronic coupling and irreversible second redn. to a non-Kekule system which helps to understand the superior photosensitizing properties of 2,2'-bipyrazine complexes. [on SciFinder(R)]},
added-at = {2019-07-15T13:41:23.000+0200},
author = {Kaim, Wolfgang and Matheis, Walter.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/228c4e8c56a225e1b65b5d6db236a9b9a/b_schwederski},
interhash = {5b4bc728ae8ad62e9e5e4bba136f516f},
intrahash = {28c4e8c56a225e1b65b5d6db236a9b9a},
issn = {0009-2940},
journal = {Chemische Berichte},
keywords = {bipyrazine bipyrazine;ruthenium bipyridine bipyrimidine complex cyclic quaternized ruthenium voltammetry},
number = 6,
pages = {1323--1325},
timestamp = {2019-07-15T11:42:10.000+0200},
title = {Coupling between polypyridineruthenium(II) and methylviologen moieties in \textgreek{p}-conjugated hybrid systems},
volume = 123,
year = 1990
}