منابع مشابه
Solid-phase synthesis of photochromic spiropyrans.
[reaction: see text] A convenient solid-phase synthesis of spiropyrans is described. A succinate linker was employed, which allows base-catalyzed cleavage of the desired photochromophore derivatized with a succinimide. Excellent yields and purities were obtained for the compounds that comprise a library of 23 spiropyrans. Opening of the succinimide ring in spiropyran could be realized under mil...
متن کاملThe balance between closed and open forms of spiropyrans in the solid state
Introduction The photochromic behaviour of spiropyrans has been known for over fifty years, and their intriguing properties and potential applications as sensors, molecular switches, erasable memories, etc., have ensured that they are of considerable interest to a broad spectrum of scientists. Spiropyrans tend to absorb light in the 200-400 nm range, which can produce bond-cleavage resulting in...
متن کاملSite effects in controlling the chemical reactivity in crystals: solid-state photochromism of N-(n-propyl)nitrospiropyrane.
The dynamics of decay of the photoproducts of the two non equivalent molecules of N-(n-propyl) nitrospiropyrane in the crystalline state is significantly different due to the effect of the specific site where each of the molecules is located in the crystal latice.
متن کاملNonlinear solid-state filter based on photochromism induced by 2-photon absorption in a dye-doped sol-gel
There is much interest in enhancement of the absorbance performance of nonlinear absorber solid-state filters. In this work we present an advanced reversible nonlinear filter based on a dye-doped sol-gel matrix. The absorbance enhancement was achieved by using a combination of two absorption mechanisms in the same molecule; a photochromic absorption which is induced by 2-photon absorption (2PA)...
متن کاملModified mesoporous MCM-41 as hosts for photochromic spirobenzopyrans.
The influence of the chemical composition and silylation of mesoporous MCM-41 materials on the photochromic behaviour of adsorbed spiropyran (BIPS) and 6-nitrospiropyran was studied. Upon incorporation, the spiropyrans underwent ring opening to form either zwitterionic merocyanine or its corresponding O-protonated form. In all silica MCM-41 or in the MCM-41 containing aluminium, the O-protonate...
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ژورنال
عنوان ژورنال: International Journal of Photoenergy
سال: 2005
ISSN: 1110-662X
DOI: 10.1155/s1110662x05000036