Efficient production of methyl viologen cation radicals using RuII systems

Talal S. Akasheh; Nathir A.F. Al-Rawashdeh

doi:10.1016/1010-6030(90)85002-E

Efficient production of methyl viologen cation radicals using Ru^II systems

Talal S. Akasheh
, Nathir A.F. Al-Rawashdeh

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

A number of Ru^II-diimine complexes were used to photosensitize methyl viologen cation radical (MV^{+{radical dot}}) production in the presence of ethylenediaminetetraacetic acid (EDTA). An unusually high quantum yield (π(MV^{+{radical dot}}) = 1.88) was obtained for [Ru(bpz)₂dpq]²⁺ (bpz = 2′,2-bipyrazine; dpq = 2,3-di-(2′-pyridyl)-quinoxaline) at pH 11. This value is higher than any previously known for Ru^II complexes. The quantum yield is discussed in terms of the electron transfer quenching process and the cage escape effects which affect geminate recombination of the redox species. Time-resolved transient absorption spectra were used to study the formation of MV^{+{radical dot}} and Ru^I in the case of [Ru(bpz)₂(dpq)]²⁺.

Original language	English
Pages (from-to)	283-292
Number of pages	10
Journal	Journal of Photochemistry and Photobiology, A: Chemistry
Volume	54
Issue number	3
DOIs	https://doi.org/10.1016/1010-6030(90)85002-E
Publication status	Published - Nov 15 1990
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Physics and Astronomy

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10.1016/1010-6030(90)85002-E

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@article{4a61623822cf46b4a4d00fa8d7161751,

title = "Efficient production of methyl viologen cation radicals using RuII systems",

abstract = "A number of RuII-diimine complexes were used to photosensitize methyl viologen cation radical (MV+\{radical dot\}) production in the presence of ethylenediaminetetraacetic acid (EDTA). An unusually high quantum yield (π(MV+\{radical dot\}) = 1.88) was obtained for [Ru(bpz)2dpq]2+ (bpz = 2′,2-bipyrazine; dpq = 2,3-di-(2′-pyridyl)-quinoxaline) at pH 11. This value is higher than any previously known for RuII complexes. The quantum yield is discussed in terms of the electron transfer quenching process and the cage escape effects which affect geminate recombination of the redox species. Time-resolved transient absorption spectra were used to study the formation of MV+\{radical dot\} and RuI in the case of [Ru(bpz)2(dpq)]2+.",

author = "Akasheh, \{Talal S.\} and Al-Rawashdeh, \{Nathir A.F.\}",

note = "Funding Information: the research grant from the Ministry of Planning, Fund and Yarmouk University. This work is part",

year = "1990",

month = nov,

day = "15",

doi = "10.1016/1010-6030(90)85002-E",

language = "English",

volume = "54",

pages = "283--292",

journal = "Journal of Photochemistry and Photobiology, A: Chemistry",

issn = "1010-6030",

publisher = "Elsevier B.V.",

number = "3",

}

TY - JOUR

T1 - Efficient production of methyl viologen cation radicals using RuII systems

AU - Akasheh, Talal S.

AU - Al-Rawashdeh, Nathir A.F.

N1 - Funding Information: the research grant from the Ministry of Planning, Fund and Yarmouk University. This work is part

PY - 1990/11/15

Y1 - 1990/11/15

N2 - A number of RuII-diimine complexes were used to photosensitize methyl viologen cation radical (MV+{radical dot}) production in the presence of ethylenediaminetetraacetic acid (EDTA). An unusually high quantum yield (π(MV+{radical dot}) = 1.88) was obtained for [Ru(bpz)2dpq]2+ (bpz = 2′,2-bipyrazine; dpq = 2,3-di-(2′-pyridyl)-quinoxaline) at pH 11. This value is higher than any previously known for RuII complexes. The quantum yield is discussed in terms of the electron transfer quenching process and the cage escape effects which affect geminate recombination of the redox species. Time-resolved transient absorption spectra were used to study the formation of MV+{radical dot} and RuI in the case of [Ru(bpz)2(dpq)]2+.

AB - A number of RuII-diimine complexes were used to photosensitize methyl viologen cation radical (MV+{radical dot}) production in the presence of ethylenediaminetetraacetic acid (EDTA). An unusually high quantum yield (π(MV+{radical dot}) = 1.88) was obtained for [Ru(bpz)2dpq]2+ (bpz = 2′,2-bipyrazine; dpq = 2,3-di-(2′-pyridyl)-quinoxaline) at pH 11. This value is higher than any previously known for RuII complexes. The quantum yield is discussed in terms of the electron transfer quenching process and the cage escape effects which affect geminate recombination of the redox species. Time-resolved transient absorption spectra were used to study the formation of MV+{radical dot} and RuI in the case of [Ru(bpz)2(dpq)]2+.

UR - https://www.scopus.com/pages/publications/0000856987

UR - https://www.scopus.com/pages/publications/0000856987#tab=citedBy

U2 - 10.1016/1010-6030(90)85002-E

DO - 10.1016/1010-6030(90)85002-E

M3 - Article

AN - SCOPUS:0000856987

SN - 1010-6030

VL - 54

SP - 283

EP - 292

JO - Journal of Photochemistry and Photobiology, A: Chemistry

JF - Journal of Photochemistry and Photobiology, A: Chemistry

IS - 3

ER -

Efficient production of methyl viologen cation radicals using Ru^II systems

Abstract

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