Efficiency of Photosubstitution of Arenetricarbonylchromium(0) Complexes

Mark S. Wrighton; Janice L. Haverty

doi:10.1515/znb-1975-3-425

Efficiency of Photosubstitution of Arenetricarbonylchromium(0) Complexes

Mark S. Wrighton
, Janice L. Haverty

Department of Chemistry

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

30 Scopus citations

Abstract

The quantum efficiency of the formation of (arene)Cr(CO)₂(pyridine) (arene = benzene, mesitylene) is reported as a function of the irradiation wavelength of (arene)Cr(CO)₃ and as a function of pyridine concentration. The quantum efficiency is independent of Pyridine concentration in the range 0.008-0.17 M. The quantum efficiency is 0.72 ± 0.07 upon 313, 366, or 436 nm irradiation. The (arene)Cr(CO)₃ complexes are found to quench triplet excited benzil at a diffusion controlled rate and the quenching is accompanied by reaction of the (arene)Cr(CO)₃. The reaction product which presumably arises from CO release is the same as that obtained from direct irradiation of (arene)Cr(CO)₃ in the presence of benzil. However, the triplet sensitized reaction occurs with a quantum efficiency of only 0.15 ± 0.05 in contrast to the high Substitution efficiency (0.72 ± 0.07) of (arene)Cr(CO)₃ upon direct irradiation.

Original language	English
Pages (from-to)	254-258
Number of pages	5
Journal	Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Volume	30
Issue number	3-4
DOIs	https://doi.org/10.1515/znb-1975-3-425
State	Published - Apr 1 1975

Keywords

Energy Transfer
Metal Carbonyl
Photodissociation
Photosubstitution

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title = "Efficiency of Photosubstitution of Arenetricarbonylchromium(0) Complexes",

abstract = "The quantum efficiency of the formation of (arene)Cr(CO)2(pyridine) (arene = benzene, mesitylene) is reported as a function of the irradiation wavelength of (arene)Cr(CO)3 and as a function of pyridine concentration. The quantum efficiency is independent of Pyridine concentration in the range 0.008-0.17 M. The quantum efficiency is 0.72 ± 0.07 upon 313, 366, or 436 nm irradiation. The (arene)Cr(CO)3 complexes are found to quench triplet excited benzil at a diffusion controlled rate and the quenching is accompanied by reaction of the (arene)Cr(CO)3. The reaction product which presumably arises from CO release is the same as that obtained from direct irradiation of (arene)Cr(CO)3 in the presence of benzil. However, the triplet sensitized reaction occurs with a quantum efficiency of only 0.15 ± 0.05 in contrast to the high Substitution efficiency (0.72 ± 0.07) of (arene)Cr(CO)3 upon direct irradiation.",

keywords = "Energy Transfer, Metal Carbonyl, Photodissociation, Photosubstitution",

author = "Wrighton, \{Mark S.\} and Haverty, \{Janice L.\}",

year = "1975",

month = apr,

day = "1",

doi = "10.1515/znb-1975-3-425",

language = "English",

volume = "30",

pages = "254--258",

journal = "Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences",

issn = "0932-0776",

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TY - JOUR

T1 - Efficiency of Photosubstitution of Arenetricarbonylchromium(0) Complexes

AU - Wrighton, Mark S.

AU - Haverty, Janice L.

PY - 1975/4/1

Y1 - 1975/4/1

N2 - The quantum efficiency of the formation of (arene)Cr(CO)2(pyridine) (arene = benzene, mesitylene) is reported as a function of the irradiation wavelength of (arene)Cr(CO)3 and as a function of pyridine concentration. The quantum efficiency is independent of Pyridine concentration in the range 0.008-0.17 M. The quantum efficiency is 0.72 ± 0.07 upon 313, 366, or 436 nm irradiation. The (arene)Cr(CO)3 complexes are found to quench triplet excited benzil at a diffusion controlled rate and the quenching is accompanied by reaction of the (arene)Cr(CO)3. The reaction product which presumably arises from CO release is the same as that obtained from direct irradiation of (arene)Cr(CO)3 in the presence of benzil. However, the triplet sensitized reaction occurs with a quantum efficiency of only 0.15 ± 0.05 in contrast to the high Substitution efficiency (0.72 ± 0.07) of (arene)Cr(CO)3 upon direct irradiation.

AB - The quantum efficiency of the formation of (arene)Cr(CO)2(pyridine) (arene = benzene, mesitylene) is reported as a function of the irradiation wavelength of (arene)Cr(CO)3 and as a function of pyridine concentration. The quantum efficiency is independent of Pyridine concentration in the range 0.008-0.17 M. The quantum efficiency is 0.72 ± 0.07 upon 313, 366, or 436 nm irradiation. The (arene)Cr(CO)3 complexes are found to quench triplet excited benzil at a diffusion controlled rate and the quenching is accompanied by reaction of the (arene)Cr(CO)3. The reaction product which presumably arises from CO release is the same as that obtained from direct irradiation of (arene)Cr(CO)3 in the presence of benzil. However, the triplet sensitized reaction occurs with a quantum efficiency of only 0.15 ± 0.05 in contrast to the high Substitution efficiency (0.72 ± 0.07) of (arene)Cr(CO)3 upon direct irradiation.

KW - Energy Transfer

KW - Metal Carbonyl

KW - Photodissociation

KW - Photosubstitution

UR - https://www.scopus.com/pages/publications/84918307090

U2 - 10.1515/znb-1975-3-425

DO - 10.1515/znb-1975-3-425

M3 - Article

AN - SCOPUS:84918307090

SN - 0932-0776

VL - 30

SP - 254

EP - 258

JO - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences

JF - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences

IS - 3-4

ER -

Efficiency of Photosubstitution of Arenetricarbonylchromium(0) Complexes

Abstract

Keywords

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