Multiwavelength time-resolved spectroscopy is employed to study the triplet-state photophysics of acridine yellow dissolved in a rigid saccharide glass. Activated reverse intersystem crossing from photoexcited triplet states to the fluorescent singlet state provides a temperaturedependent decay pathway of the triplet population. While a unimolecular relaxation of a homogeneous excited triplet p...

The UV laser flash excitation of diphenylamine in methanol at 308 nm leads to similar triplet decay routes as those found previously for N-methyldiphenylamine and triphenylamine. The temperature dependence of the diphenylamine triplet decay shows that both ring closure to form triplet dihydrocarbazole and intersystem crossing back to the ground state take place. The Arrhenius parameters for the...

In this study, electronic structures of ground state of pure vanadium sub-nano clusters, Vn (n=2-5), and their interactions with small ligands for example CO and triplet O2 molecules are investigated by using density functional theory (DFT) calibration at the mPWPW91/QZVP level of theory. The favorable orientations of these ligands in interaction with pure vanadium sub-nano clusters were determ...

Two-photon laser flash photolysis was used to investigate the wavelength dependence of upper excited state chemistry of Rose Bengal (RB) in order to rationalize differences in RB-sensitized inhibition of acetylcholinesterase (ACE) in red blood cell ghosts, observed using different irradiation modes. The absorption of the RB triplet state, generated using 532-nm irradiation, was monitored as a f...

hours the rotation was again taken: [ C ~ ] ~ D +77.2 * 5" (a% +1.75 * 0.1'; 1 = 2 dm.). Treatment of 17-Isopregnan-3( a)-ol-20-one with Hydrogen chloride.-In a manner similar to the above a solution of 44.7 mg. of 17-isopregnan-3(a)-ol-20-one made up to 5 ml. with 4.3% methanolic hydrogen chloride was refluxed for four hours and then the rotation was taken: [ a I s 1 ~ $75.6 * 5" ( C Y ~ ~ D $...

The IR-dyes, having the absorption maximum in the range of 600 nm to 1100 nm, are expected to have very low triplet e nergy level. The triplet-triplet (T-T) absorption spectra and decay characteris tics have becn invcstigated for four IR laser dyes, namely, IR-140, IR-144, Q-Switch I and Q-Switch 5. Triplet state of these IR dyes are generated by electron pulse radiolysis in benzene-benzonitril...

Indigo is one of the most emblematic molecules for the color blue, and is believed in many cultures to be charged with unique talismanic properties. The vivid color and high stability of this dye have led to an almost mythical status, from the “tecklet” of the Hebrews (believed to be a mixture with Tyrian Purple), through the blue of Napoleon Bonaparte(s army uniforms, to its current applicatio...

The triplet excited state behavior of c84 has been probed by the triplet-triplet energy transfer method using pulse radiolytically generated biphenyl triplets in benzene. The triplet excited state has a weak absorption in the UV (difference absorption maxima at 3 10 and 345 nm) but no significant absorption in the visible. The rate constants for energy transfer from 3BP* and 3C60* are 4 x lo9 a...