Photo-induced valence tautomerism in a Co compound

Osamu Sato; Shinya Hayami; Zhong Ze Gu; Kazuyuki Takahashi; Rie Nakajima; Kanako Seki; Akira Fujishima

doi:10.1016/S1010-6030(01)00647-5

Photo-induced valence tautomerism in a Co compound

Osamu Sato, Shinya Hayami, Zhong Ze Gu, Kazuyuki Takahashi, Rie Nakajima, Kanako Seki, Akira Fujishima

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33 Citations (Scopus)

Abstract

Photo-illumination effects have been measured for where LS, tmeda, 3,5-DBSQ and 3,5-DBCat denote low-spin, N,N,N′,N′-tetramethylethylenediamine, 3,5-di-tert-butyl-1,2-semiquinonate and 3,5-di-tert-butyl-1,2-catecholate, respectively. When the title compound was illuminated at 5 K, the magnetization value increased from μ_eff = 1.7 to 2.3 μ_B. The absorption spectra after illumination show that the absorption band at around 800 nm, characteristic of the [Co^II-HS(tmeda)(3,5-DBSQ)₂] state (HS denotes high-spin), increased and the charge transfer band from 3,5-DBCat to 3,5-DBSQ at 2500 nm was reduced. IR spectra show that the C-O stretching peak at 1280 cm^-1 is significantly decreased. These results confirm that a photo-induced intra-molecular electron transfer, [Co^III-LS(tmeda)(3,5-DBSQ)(3,5-DBCat)] → [Co^II-HS(tmeda)(3,5-DBSQ)₂], was induced. The lifetime of the metastable state at 5 K was 175 min.

Original language	English
Pages (from-to)	111-114
Number of pages	4
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	149
Issue number	1-3
DOIs	https://doi.org/10.1016/S1010-6030(01)00647-5
Publication status	Published - Jun 28 2002
Externally published	Yes

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All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Physics and Astronomy(all)

Cite this

Sato, O., Hayami, S., Gu, Z. Z., Takahashi, K., Nakajima, R., Seki, K., & Fujishima, A. (2002). Photo-induced valence tautomerism in a Co compound. Journal of Photochemistry and Photobiology A: Chemistry, 149(1-3), 111-114. https://doi.org/10.1016/S1010-6030(01)00647-5

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title = "Photo-induced valence tautomerism in a Co compound",

abstract = "Photo-illumination effects have been measured for where LS, tmeda, 3,5-DBSQ and 3,5-DBCat denote low-spin, N,N,N′,N′-tetramethylethylenediamine, 3,5-di-tert-butyl-1,2-semiquinonate and 3,5-di-tert-butyl-1,2-catecholate, respectively. When the title compound was illuminated at 5 K, the magnetization value increased from μeff = 1.7 to 2.3 μB. The absorption spectra after illumination show that the absorption band at around 800 nm, characteristic of the [CoII-HS(tmeda)(3,5-DBSQ)2] state (HS denotes high-spin), increased and the charge transfer band from 3,5-DBCat to 3,5-DBSQ at 2500 nm was reduced. IR spectra show that the C-O stretching peak at 1280 cm-1 is significantly decreased. These results confirm that a photo-induced intra-molecular electron transfer, [CoIII-LS(tmeda)(3,5-DBSQ)(3,5-DBCat)] → [CoII-HS(tmeda)(3,5-DBSQ)2], was induced. The lifetime of the metastable state at 5 K was 175 min.",

author = "Osamu Sato and Shinya Hayami and Gu, {Zhong Ze} and Kazuyuki Takahashi and Rie Nakajima and Kanako Seki and Akira Fujishima",

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T1 - Photo-induced valence tautomerism in a Co compound

AU - Sato, Osamu

AU - Hayami, Shinya

AU - Gu, Zhong Ze

AU - Takahashi, Kazuyuki

AU - Nakajima, Rie

AU - Seki, Kanako

AU - Fujishima, Akira

PY - 2002/6/28

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N2 - Photo-illumination effects have been measured for where LS, tmeda, 3,5-DBSQ and 3,5-DBCat denote low-spin, N,N,N′,N′-tetramethylethylenediamine, 3,5-di-tert-butyl-1,2-semiquinonate and 3,5-di-tert-butyl-1,2-catecholate, respectively. When the title compound was illuminated at 5 K, the magnetization value increased from μeff = 1.7 to 2.3 μB. The absorption spectra after illumination show that the absorption band at around 800 nm, characteristic of the [CoII-HS(tmeda)(3,5-DBSQ)2] state (HS denotes high-spin), increased and the charge transfer band from 3,5-DBCat to 3,5-DBSQ at 2500 nm was reduced. IR spectra show that the C-O stretching peak at 1280 cm-1 is significantly decreased. These results confirm that a photo-induced intra-molecular electron transfer, [CoIII-LS(tmeda)(3,5-DBSQ)(3,5-DBCat)] → [CoII-HS(tmeda)(3,5-DBSQ)2], was induced. The lifetime of the metastable state at 5 K was 175 min.

AB - Photo-illumination effects have been measured for where LS, tmeda, 3,5-DBSQ and 3,5-DBCat denote low-spin, N,N,N′,N′-tetramethylethylenediamine, 3,5-di-tert-butyl-1,2-semiquinonate and 3,5-di-tert-butyl-1,2-catecholate, respectively. When the title compound was illuminated at 5 K, the magnetization value increased from μeff = 1.7 to 2.3 μB. The absorption spectra after illumination show that the absorption band at around 800 nm, characteristic of the [CoII-HS(tmeda)(3,5-DBSQ)2] state (HS denotes high-spin), increased and the charge transfer band from 3,5-DBCat to 3,5-DBSQ at 2500 nm was reduced. IR spectra show that the C-O stretching peak at 1280 cm-1 is significantly decreased. These results confirm that a photo-induced intra-molecular electron transfer, [CoIII-LS(tmeda)(3,5-DBSQ)(3,5-DBCat)] → [CoII-HS(tmeda)(3,5-DBSQ)2], was induced. The lifetime of the metastable state at 5 K was 175 min.

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10.1016/S1010-6030(01)00647-5