The fluorescence quantum yields of nitro-substituted Fluoresceins depends on their structure, degree of protonation, solvent nature, aggregative state, and temperature. A scheme is proposed for the energy levels in the molecules of these compounds, which involves closely located S 1 ( *) and T(n *) states and their possible inversion. Studies of luminescence properties of nitroaromatic compounds involve some problems associated with both a weak (as a rule) luminescence intensity and interpretation of the results which are influences by a variety of chemical and physical factors (1 4). Of particular importance are extent of the -system and contribution of n * levels to electronically excited levels of charge-transfer states. Derivatives of Fluores- cein (I) and Eosin (II), having a nitro group in the xanthene core (compounds III VII) (5), seem to be convenient models for estimation of the effect of the above factors on the general phototransformation pattern. Available data on the influence of the nitro group on luminescence properties in the series of xanthene dyes refer only to Eosine B (VI) and are fragmentary (efficiency of population of T 1 states) and contradictory (6, 7). X X A 2 Y 2 A 1 Y 1

Luminescence Properties of Nitro Derivatives of Fluorescein

Chemical luminescence analysis of inorganic substances

A theoretical study of the effects of inhomogeneous level broadening on the spectral kinetic characteristics of the delayed emission from solid polar solutions of complex compounds

We present a simulation model for a stream of photon counts that can be detected in fluorescence fluctuation spectroscopy systems from diffusing molecules undergoing spontaneous transitions between radiative and nonradiative states. Using our model, we can obtain various characteristics of a random stream of photon counts which allows us to test fluorescence fluctuation spectroscopy methods and to predict the results of full-scale experiments.

Simulation of a stream of photon counts in single-molecule fluorescence fluctuation spectroscopy

Spectral — Kinetic properties of the delayed fluorescence of complex molecules with inhomogeneously broadened energy levels

Триплетное состояние и электронные процессы в органических молекулах

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Триплетное состояние и электронные процессы в органических молекулах