Photochemical Evidence for Triplet State Quenching by Paramagnetic Species

Abstract

LETTERS TO THE EDITOR effects. Our results are in fair agreement with those obtained by electron diffraction; the 0-0 bond distance provides the most reliable comparison between the two methods and agrees within the experimental errors.This work was suggested by Professor E. B. Wilson, Jr., and the major portion of it was done in his laboratory.

Mechanisms of Photoreactions in Solution. XX.1 Quenching of Excited States of Benzophenone by Metal Chelates

“…Soc., 52, 3139 (1930). " The initial benzophenone concentration in all of the experiments was 0.10 M. 6 The solvent used for all experiments listed here was benzene unless indicated otherwise. 0 DPM is dipivaloylmethanate; AA is acetylacetonate; MAA is 3-methylacetylacetonate; AC is 2-acetylcyclohexanonate.…”

Roles of Calcium, Zinc, Copper and Titanium Compounds on the Degradation of Polymers

“…With 0.1 wt.% of well-dispersed quenchers, an efficient quenching effect can be achieved even in 5 nm separated stabilizer and chromophore [29] . The earlier studies on the quenching effects upon photo-oxidation have been conducted by researchers and it was reported that the most common quenchers are the metal chelates [54] . Metal chelates that are derived from b-diketone give potential reactivity in photo-reduction of benzophenone (C 12 H 10 CO) by benzhydrol (C 12 H 10 CHOH) [55] .…”

The Photosensitized Reaction of Dichloromaleic Anhydride with Benzene. A Novel Variation in the Photochemistry of Maleic Anhydride Derivatives

“…134-135°; ultraviolet spectrum: Xmax 333, 460, 490, and 522 µ; n.m.r. spectrum: C-2, C-3, and C-6 methoxyl, 4.04, 4.08, 4.16; C-7 hydroxyl, 6.90 (broad); C-5 and C-8 hydroxyl, 12.16 and 13.30. Methylation of 9 with diazomethane yielded 2,3,6,7tetramethoxynaphthazarin, m.p. 185-186°( lit.8 m.p.…”