منابع مشابه
Photochemistry of 2-(4-hydroxystyryl)-1-naphthopyrylium.
A new photochromic system based on 2-(4-hydroxystyryl)-1-naphthopyrylium encompasses the properties of the previously described naphthoflavylium and styrylflavylium systems. The photoproduct exhibits a colour deep in hue and is red shifted in comparison with the equivalent flavylium system. Reaction of 2-hydroxy-1-naphthaldehyde with p-hydroxystyrylmethylketone in acetic acid in the presence of...
متن کاملPhotochemistry of „ OCS ... n 2 cluster ions
We report the photochemistry of (OCS)n 2 cluster ions following 395 nm (n52 – 28) and 790 nm (n52 – 4) excitation. In marked contrast to (CO2)n 2 , extensive bond breaking and rearrangement is observed. Three types of ionic products are identified: S2 ~OCS!k , S ~OCS!k /OCS2 ~OCS!k21 , and (OCS)k 2 . For n,16, 395 nm dissociation is dominated by S2 -based fragments, supporting the theoretical p...
متن کاملStudies on the photochemistry of 2-methyl-1,4-naphthoquinone.
It has been known since the isolation of the vitamins K that derivatives of 2-methyl-1,4-naphthoquinone (MN&) are unstable to light (l-5). However, the exact nature of the chemical change is still under discussion (6, 7). An interesting observation by MacCorquodale and coworkers (3) that the vitamin is quite stable as it exists in crude extracts, only becoming labile after a fair degree of puri...
متن کاملThe pH-dependent photochemistry of anthraquinone-2-sulfonate.
The photochemistry of anthraquinone-2-sulfonate (AQ2S) was studied as a function of pH, combining laser flash photolysis and steady-state irradiation experiments, with the additional help of a computational study of energy levels. Two out of the three transient species produced upon irradiation of AQ2S can be involved into the degradation of dissolved molecules, and also AQ2S in its ground stat...
متن کاملAdenine and 2-aminopurine: paradigms of modern theoretical photochemistry.
Distinct photophysical behavior of nucleobase adenine and its constitutional isomer, 2-aminopurine, has been studied by using quantum chemical methods, in particular an accurate ab initio multiconfigurational second-order perturbation theory. After light irradiation, the efficient, ultrafast energy dissipation observed for nonfluorescent 9H-adenine is explained here by the nonradiative internal...
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ژورنال
عنوان ژورنال: Tetrahedron Letters
سال: 1977
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)92748-0