Spectroscopic studies of the role of silyl radicals in photolysis of polysilanes

Davorka Azinović; D. Bravo-Zhivotovskii; M. Bendikov; Y. Apeloig; B. Tumanskii; S. Vepřek

doi:10.1016/S0009-2614(03)00717-6

Spectroscopic studies of the role of silyl radicals in photolysis of polysilanes

Davorka Azinović, D. Bravo-Zhivotovskii, M. Bendikov, Y. Apeloig, B. Tumanskii, S. Vepřek

Weizmann Institute of Science, Israel

Research output: Contribution to journal › Article

12 Citations (Scopus)

Abstract

Absorption, ESR and photoluminescence of hexakis(pentamethyldisilyl)disilane [(Me₃SiMe₂Si) ₃Si]₂ 1 were studied. Two branched polysilyl radicals were observed by ESR spectroscopy under UV irradiation of 1. The smaller 'star' radical (Me₃SiMe₂Si) ₃Si 2 has half-lifetime 1 s whereas the bigger one (Me₃SiMe₂Si)₃Si (Me₃SiMe₂Si)₂Si 3 has a half-lifetime about 50 min. During irradiation the reaction 1 → 2 + 3 followed by 2 + 3 → products (P) occur. The behavior of the 300 nm absorption of radical 3 during the irradiation was found to be similar to the radical 3 appearance measured by ESR. The silane (Me₃SiMe₂Si)₃SiH was found as main product (∼50% yield) of the photo-cleavage of the disilane 1.

Original language	English
Pages (from-to)	257-263
Number of pages	7
Journal	Chemical Physics Letters
Volume	374
Issue number	3-4
DOIs	https://doi.org/10.1016/S0009-2614(03)00717-6
Publication status	Published - Jun 11 2003

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ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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Azinović, D., Bravo-Zhivotovskii, D., Bendikov, M., Apeloig, Y., Tumanskii, B., & Vepřek, S. (2003). Spectroscopic studies of the role of silyl radicals in photolysis of polysilanes. Chemical Physics Letters, 374(3-4), 257-263. https://doi.org/10.1016/S0009-2614(03)00717-6

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title = "Spectroscopic studies of the role of silyl radicals in photolysis of polysilanes",

abstract = "Absorption, ESR and photoluminescence of hexakis(pentamethyldisilyl)disilane [(Me3SiMe2Si) 3Si]2 1 were studied. Two branched polysilyl radicals were observed by ESR spectroscopy under UV irradiation of 1. The smaller 'star' radical (Me3SiMe2Si) 3Si 2 has half-lifetime 1 s whereas the bigger one (Me3SiMe2Si)3Si (Me3SiMe2Si)2Si 3 has a half-lifetime about 50 min. During irradiation the reaction 1 → 2 + 3 followed by 2 + 3 → products (P) occur. The behavior of the 300 nm absorption of radical 3 during the irradiation was found to be similar to the radical 3 appearance measured by ESR. The silane (Me3SiMe2Si)3SiH was found as main product (∼50% yield) of the photo-cleavage of the disilane 1.",

author = "Davorka Azinovi{\'c} and D. Bravo-Zhivotovskii and M. Bendikov and Y. Apeloig and B. Tumanskii and S. Vep{\v r}ek",

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AU - Azinović, Davorka

AU - Bravo-Zhivotovskii, D.

AU - Bendikov, M.

AU - Apeloig, Y.

AU - Tumanskii, B.

AU - Vepřek, S.

PY - 2003/6/11

Y1 - 2003/6/11

N2 - Absorption, ESR and photoluminescence of hexakis(pentamethyldisilyl)disilane [(Me3SiMe2Si) 3Si]2 1 were studied. Two branched polysilyl radicals were observed by ESR spectroscopy under UV irradiation of 1. The smaller 'star' radical (Me3SiMe2Si) 3Si 2 has half-lifetime 1 s whereas the bigger one (Me3SiMe2Si)3Si (Me3SiMe2Si)2Si 3 has a half-lifetime about 50 min. During irradiation the reaction 1 → 2 + 3 followed by 2 + 3 → products (P) occur. The behavior of the 300 nm absorption of radical 3 during the irradiation was found to be similar to the radical 3 appearance measured by ESR. The silane (Me3SiMe2Si)3SiH was found as main product (∼50% yield) of the photo-cleavage of the disilane 1.

AB - Absorption, ESR and photoluminescence of hexakis(pentamethyldisilyl)disilane [(Me3SiMe2Si) 3Si]2 1 were studied. Two branched polysilyl radicals were observed by ESR spectroscopy under UV irradiation of 1. The smaller 'star' radical (Me3SiMe2Si) 3Si 2 has half-lifetime 1 s whereas the bigger one (Me3SiMe2Si)3Si (Me3SiMe2Si)2Si 3 has a half-lifetime about 50 min. During irradiation the reaction 1 → 2 + 3 followed by 2 + 3 → products (P) occur. The behavior of the 300 nm absorption of radical 3 during the irradiation was found to be similar to the radical 3 appearance measured by ESR. The silane (Me3SiMe2Si)3SiH was found as main product (∼50% yield) of the photo-cleavage of the disilane 1.

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10.1016/S0009-2614(03)00717-6