Effect of substituents on the fluorescence spectra of simple coumarins

Fedorin, G. F.; Georgievskii, V. P.

doi:10.1007/bf00617307

Cited by 6 publications

(2 citation statements)

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“…cm-') and 7-hydroxycoumarin(19.600crn-',~ = 18,500 k 1OOOM-' cm-') have been reported by Crozet [34]. Substituent effects on the fluorescence of coumarins has been described [42]. Coumarin and its methyl derivatives are nonfluorescent in methanol, but that addition of an electron donor to the benzene ring allows the molecule to fluoresce.…”

Section: Cournurinsmentioning

confidence: 94%

Excited States of Biomolecules—iv

Fugate

Song

1976

Photochem & Photobiology

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The electronic excited states of biomolecules are selectively reviewed from approximately mid 1975 through mid 1976. The inclusion of all papers has not been attempted and exclusion does not necessarily reflect the pertinence of a paper. We urge authors to send us their reprints for future series of this Yearly Review. Porphyrins and chlorophyllsThe CND0/2 calculations have been performed for chlorophyll a (chl a), chlorophyll b (chl b) and their Be analogs [65]. Results indicate that the 3d atomic orbitals of the metal contribute significantly to the CJ and n bonding energies. The molecule is stabilized by 167 kJ . mol-' (40 kcal mol-I) when MgZf is replaced by Be2+. Shipman et al. [ 12 11 have discussed

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Section: Cournurinsmentioning

confidence: 94%

Excited States of Biomolecules—iv

Fugate

Song

1976

Photochem & Photobiology

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“…Coumarin has historically been the subject of intense photochemical and spectroscopic interest mainly as a consequence of its significance in biological systems and use in various materials of commercial interest. [21][22][23][24][25][26][27][28] Recently, we have been exploring the role of cucurbit [8]urils (CB [8]) in derstood based on the photoproduct distribution as the anti dimer is formed outside the cavity (in water) while syn dimer is observed within the cavity.…”

Section: Coumarin Derivatives As Molecular Probesmentioning

confidence: 99%

Fun with Photons: Selective Light Induced Reactions in Solution and in Water Soluble Nano-containers

Ayitou¹,

Pemberton²,

Kumarasamy³

et al. 2011

Chimia

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Two distinct strategies for controlling selectivity, in particular stereoselectivity in photochemical reactions are reviewed. In the first strategy, supramolecular approach using cucurbituril nano-containers in catalytic amounts is employed to control selectivity during photochemical transformations. In the second approach, a generalized methodology for carrying out light-induced transformations in solution at ambient conditions is detailed where axially chiral motifs are employed to enantiospecifically transfer the axial chirality in the reactant to point chirality in the photoproduct(s).

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