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The primary photochemical reaction step of unsubstituted indolino-spiropyrans

Ernsting, N. P. and Dick, Bernhard and Arthen-Engeland, T. (1990) The primary photochemical reaction step of unsubstituted indolino-spiropyrans. Pure and Applied Chemistry 62 (8), pp. 1483-1488.

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Abstract

The photochem. ring-opening of unsubstituted indolino-spiropyrans to the corresponding merocyanines in pentane, was followed by transient absorption spectroscopy. The temporal resoln. was better than 0.4 ps. During the pump pulse, an ultrafast unstructured absorption covered the entire measurement range 380-680 nm. From it emerged the structured absorption spectrum of a 1st merocyanine isomer, with typical time consts. in the range 0.9-1.4 ps. The transient merocyanine spectra are compared to the spectra which are obtained when the spiropyrans are irradiated at low temp. in argon. In conjunction with semiempirical calcns., the 1st merocyanine isomer is assigned a trans-trans-cis structure.

Item Type:

Article

Additional information (public):

CAN 113:181179 74-1 Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes 2016-67-3; 51870-76-9 Role: USES (Uses) (MNDO calcns. of, in ground state, primary photochem. processes of photochromic indolino-spiropyrans in relation to); 1485-92-3; 1592-43-4 Role: RCT (Reactant), RACT (Reactant or reagent) (photochem. reactions of, primary processes in)

Institutions:

Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Light and Matter) > Prof. Dr. Bernhard Dick

Identification Number:

Value	Type
1990:581179	Other
10.1351/pac199062081483	DOI

Keywords:

Photochromism (of indolino-spiropyrans, primary photochem. reactions in); Ultraviolet and visible spectra (of transient products, in primary processes of photolysis of indolino-spiropyrans); Photolysis (laser-induced, of unsubstituted indolino-spiropyrans, primary processes in); photolysis indolino spiropyran merocyanine formation; photochromism indolino spiropyran

Subjects:

500 Science > 540 Chemistry & allied sciences

Status:

Published

Refereed:

Yes, this version has been refereed

Created at the University of Regensburg:

Owner:

Universitätsbibliothek Regensburg

Deposited On:

19 Jan 2009 17:17

Last Modified: