Abstract
Analogues of the dipyrromethene-BF2, dye PM567 modified at the 8-position by acetoxymethyl (PlAc), s-acetoxypentyl (P5Ac), and p-acetoxymethylphenyl (PArlAc) groups are studied in ethyl acetate solution. PM567 modified at the 8-position by methacryloyloxymethyl (PlMA), s-methacryloyloxypentyl (P5MA), and p-methacryloyloxymethylphenyl (PArlMA) groups have been copolymerized with methyl ...
Abstract
Analogues of the dipyrromethene-BF2, dye PM567 modified at the 8-position by acetoxymethyl (PlAc), s-acetoxypentyl (P5Ac), and p-acetoxymethylphenyl (PArlAc) groups are studied in ethyl acetate solution. PM567 modified at the 8-position by methacryloyloxymethyl (PlMA), s-methacryloyloxypentyl (P5MA), and p-methacryloyloxymethylphenyl (PArlMA) groups have been copolymerized with methyl methacrylate (MMA), and these solid samples are also studied. The absorption cross-section and stimulated emission cross-section spectra are determined. The fluorescence quantum distributions and fluorescence lifetimes are measured. Saturable absorption measurements with picosecond laser excitation are carried out for excited-state absorption cross-section determination at the excitation wavelength. The photo-degradation of the dyes is studied under cw laser excitation conditions and quantum yields of photo-degradation are extracted. (c) 2004 Elsevier B.V. All rights reserved.
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