NDLI: Probing photochromic properties by correlation of UV-visible and infra-red absorption spectroscopy: a case study with cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene

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Probing photochromic properties by correlation of UV-visible and infra-red absorption spectroscopy: a case study with cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene

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Photochemical & Photobiological Sciences Vol -8

Photochemical & Photobiological Sciences Vol -7

Photochemical & Photobiological Sciences Vol -6

Photochemical & Photobiological Sciences Vol -5

Photochemical & Photobiological Sciences Vol -4

Photochemical & Photobiological Sciences Vol -3

Photochemical & Photobiological Sciences Vol -2

Probing photochromic properties by correlation of UV-visible and infra-red absorption spectroscopy: a case study with cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene

Content Provider	Royal Society of Chemistry (RSC)
Author	Métivier, Rémi Perez, Jose Alejandro Piedras Brosseau, Arnaud Spangenberg, Arnaud Piard, Jonathan Patra, Abhijit Nakatani, Keitaro
Copyright Year	2010
Abstract	Quantification of the relative composition of the isomers in a photochromic system at any irradiation time interval is a critical issue in determining absolute quantum yields. For this purpose, we have developed a simple and convenient protocol involving combination of UV-visible and infra-red absorption spectroscopy. Photochromic cyclization reaction of cis-l,2-dicyano-l,2-bis(2,4,5-trimethyl-3-thieny1)ethene (CMTE) is analyzed to demonstrate the efficiency of the proposed methodology. This approach is based on the fact that the two isomers show distinctive infra-red bands. Detailed investigations of the UV-visible and infra-red spectra of the mixture obtained at different irradiation times in CCl4 supported by quantum chemical computations lead to the unambiguous estimation of molar absorption coefficients of the closed isomer (εCF = 4650 L mol−1 cm−1 at 512 nm). It facilitates the first determination of absolute quantum yields of this reversible photochromic reaction in CCl4 by fitting the UV-visible spectral data (ΦOF→CF = 0.41 ± 0.05 and ΦCF→OF = 0.12 ± 0.02 at 405 nm and 546 nm, respectively).
Starting Page	188
Ending Page	193
Page Count	6
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	9
Issue Number	2
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b9pp00133f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Photochromism Ethylene CompactFlash Concentration Isomer
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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Probing photochromic properties by correlation of UV-visible and infra-red absorption spectroscopy: a case study with cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene

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Probing photochromic properties by correlation of UV-visible and infra-red absorption spectroscopy: a case study with cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene