Showing papers by "Prashant V. Kamat published in 1982"
TL;DR: In this article, the quenching of the ground state thionine (TH+) by ground state methylene blue (MBH2+) was investigated by laser flash photolysis employing frequency-dubled (347.2 nm) flashes from a Q-switched ruby laser.
29 citations
TL;DR: In this paper, the influence of the polymer [poly(4-vinyl-pyridine)] on the photochemical properties of croconate violet was discussed, and its fluorescence lifetime was increased from <9 ps to 28 ps.
16 citations
8 citations
TL;DR: In this paper, the triplet state of N,N,Ni,Ni-tetraethyloxonine, TEO+ generated by means of sensitization with 9,10-dibromoanthracene, was investigated in ethanol solution by laser flash photolysis-kinetic spectrometry employing the first harmonic of a Q-switched ruby laser at 347.2 nm.
Abstract: The triplet state of N,N,Ni,Ni-tetraethyloxonine, TEO+ generated by means of sensitization with 9,10-dibromoanthracene, was investigated in ethanol solution by laser flash photolysis-kinetic spectrometry employing the first harmonic of a Q-switched ruby laser at 347.2 nm. Quenching of both the protonated triplet, TEOH2+(T1), τ = 47 μs, and the unprotonated triplet, TEO+(T1), τ = 285 μs, by TEO+(S0) proceeds with substantial net electron transfer. No net electron transfer is detectable in the quenching of TEOH2+(T1), and TEO+(T1) by O2 or 1,3,5,7-cyclooctatetraene, processes which apparently involve transfer of energy. Specific rates of quenching are reported and the implications of the quenching processes for stability of TEO+ in devices for conversion or storage of solar energy are discussed.
7 citations