Direct observation of acyl azide excited states and their decay processes by ultrafast time resolved infrared spectroscopy

Jacek Kubicki; Yunlong Zhang; Jin Wang; Hoi Ling Luk; Huo Lei Peng; Shubham Vyas; Matthew S. Platz

doi:10.1021/ja9002102

Direct observation of acyl azide excited states and their decay processes by ultrafast time resolved infrared spectroscopy

Jacek Kubicki, Yunlong Zhang, Jin Wang, Hoi Ling Luk, Huo Lei Peng, Shubham Vyas, Matthew S. Platz

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

38 Scopus citations

Abstract

The photochemistry of three carbonyl azides was studied by ultrafast time-resolved IR spectroscopy. Benzoyl, 2-naphthoyl, and pivavoyl azides are promoted to upper excited states S _n with 270 nm excitation in chloroform. The S _n states decay in 300 fs to form both the carbonylnitrenes and the S ₁ excited states. The decay of the S ₁ states of the carbonyl azides correlates with the growth of isocyanates. Formation of carbonylnitrene from S ₁ is at most a minor process if it happens at all. The quantum yields of azide decomposition of these azides with 270 nm light are close to unity in chloroform.

Original language	English (US)
Pages (from-to)	4212-4213
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	131
Issue number	12
DOIs	https://doi.org/10.1021/ja9002102
State	Published - Apr 1 2009
Externally published	Yes

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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title = "Direct observation of acyl azide excited states and their decay processes by ultrafast time resolved infrared spectroscopy",

abstract = "The photochemistry of three carbonyl azides was studied by ultrafast time-resolved IR spectroscopy. Benzoyl, 2-naphthoyl, and pivavoyl azides are promoted to upper excited states S n with 270 nm excitation in chloroform. The S n states decay in 300 fs to form both the carbonylnitrenes and the S 1 excited states. The decay of the S 1 states of the carbonyl azides correlates with the growth of isocyanates. Formation of carbonylnitrene from S 1 is at most a minor process if it happens at all. The quantum yields of azide decomposition of these azides with 270 nm light are close to unity in chloroform.",

author = "Jacek Kubicki and Yunlong Zhang and Jin Wang and Luk, {Hoi Ling} and Peng, {Huo Lei} and Shubham Vyas and Platz, {Matthew S.}",

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T1 - Direct observation of acyl azide excited states and their decay processes by ultrafast time resolved infrared spectroscopy

AU - Kubicki, Jacek

AU - Zhang, Yunlong

AU - Wang, Jin

AU - Luk, Hoi Ling

AU - Peng, Huo Lei

AU - Vyas, Shubham

AU - Platz, Matthew S.

PY - 2009/4/1

Y1 - 2009/4/1

N2 - The photochemistry of three carbonyl azides was studied by ultrafast time-resolved IR spectroscopy. Benzoyl, 2-naphthoyl, and pivavoyl azides are promoted to upper excited states S n with 270 nm excitation in chloroform. The S n states decay in 300 fs to form both the carbonylnitrenes and the S 1 excited states. The decay of the S 1 states of the carbonyl azides correlates with the growth of isocyanates. Formation of carbonylnitrene from S 1 is at most a minor process if it happens at all. The quantum yields of azide decomposition of these azides with 270 nm light are close to unity in chloroform.

AB - The photochemistry of three carbonyl azides was studied by ultrafast time-resolved IR spectroscopy. Benzoyl, 2-naphthoyl, and pivavoyl azides are promoted to upper excited states S n with 270 nm excitation in chloroform. The S n states decay in 300 fs to form both the carbonylnitrenes and the S 1 excited states. The decay of the S 1 states of the carbonyl azides correlates with the growth of isocyanates. Formation of carbonylnitrene from S 1 is at most a minor process if it happens at all. The quantum yields of azide decomposition of these azides with 270 nm light are close to unity in chloroform.

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Direct observation of acyl azide excited states and their decay processes by ultrafast time resolved infrared spectroscopy

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