Quantum yield table

Triplet state (cont d) intersystem crossing quantum yields, table of, 239-240 lifetime, 12 lowest triplet energies of carbonyls, table of, 224-225 of hydrocarbons, table of, 226 of various organic molecules, table of, 227... 

X lO M cm for this Q-type band). The absorption of this species at this wavelength is thus approximately four times greater than that of Photofrin . BPD-MA also displays a good singlet oxygen quantum yield (Table 1) [266-268]. In humans, the pharmacokinetic plasma clearance rate (i.e. pK half-life) of BPD-MA is on the order of 5.5 h (personal communication with David Mitchell, Director of Regulatory Affairs, QLT Phototherapeutics, Inc.)... 

Most 1,3,5-trithianes are active co-initiators in benzophenone-induced polymerization. The most efficient is /i-TMT, whose reactivity significantly exceeds that of the a-isomer. Consideration of the order of the quantum yields (Table 12) suggests... 

According to Blacet and Calvert , CH4, CgHg and /i-C6Hi4 are not formed in the presence of iodine. The values of co CaHs decrease, while CaUyi increases with increasing iodine concentration limiting values are attained above about 2 torr I2 added. The limiting quantum yields (Table 12) were found to be practically independent of temperature. 

Because trans to cis photoisomerization also occurs at the same but with a lower quantum yield (Table 2), irradiation of either isomer leads to a photostationary state containing both isomers in solution. 

Irradiation (546 nm) of HCl solutions of the blue HRh2CF complex leads to the production of Rh2Cl2 and H2 gas (Reaction 5). The back thermal reaction is relatively slow, taking several days to return the system to the initial state. When O2 is present, Rh2Cl2 is produced with higher quantum yields (Table II), indicating preferential reduction of O2 (rather than reduction of 2H to H2). The nature of the dependence of the quantum yield for H2 production in degassed HCl solutions on an+... 

The photocatalytic competencies of these rhenium complexes are strongly correlated with their first reversible reduction potentials [9]. Specifically, rhenium complexes whose 1/2 > -1.4 V vs Ag/AgN03, i.e., 2c, 3b, and 3c, exhibited only low photocatalytic quantum yields (Table 1). 

This Cl model has been widely employed for explaining the low quantum yield of ESIPT chromophores. However, two ciystal polymorphs and the amorphous solid of 11 exhibit bright ESIPT luminescence with relatively high quantum yields (Table 2), clearly demonstrating emission enhancement in the solid state. Since the amorphous powder and the frozen solution also show bright yellow luminescence, no specific mode of molecular packing is required for the emission enhancement. Therefore, the observed emission enhancement is ascribed to the result of RIR by inhibition of the radiationless decay pathway through Cl. 

Doubling the vapor pressure deficit from about 9.2 to 18.6 mbars results in a 20% inhibition of quantum yield (Table 1). 

Photolysis Quantum Yields. Table 4.6 shows the wavelength threshold below which the production of the pairs of either the ground or excited states of NO(X Il, A E ) and 0( P, D, S) in the photolysis of NO2 (Okabe 1978). From Table 4.6 it... 

A systematic study of the luminescent properties of freshly prepared methanolic solutions of Eu(II) complexes with various crown ethers, cryptands, and podands has been undertaken by Adachi et al. (1980,1983, 1985a,b). The stoichiometry of the complexes formed in solution is determined by Job s plots in which the emission intensity is plotted versus the L M molar ratio. Such plots have to be interpreted with care in the case where different complexes form which have similar emission spectra but different quantum yields. Some of these stoichiometries have been confirmed by NMR measurements. The luminescence quantum yields (table 26) are markedly enhanced by complex formation, especially with... 

Although differences in structure give rise to differences in quantum yield (Table 1) several factors are involved and no clear pattern can be seen. Some doubt is cast on the conclusion (see p. 23) that after allowing for the effects of oxygen quenching, unit quantum yields are expected. In the case of dimedone... 

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