Optical limiting properties of D-π-A BODIPY dyes in the presence and absence of methyl groups at the 1,7-positions

Autor:	Aviwe K. May, Tebello Nyokong, John Mack
Rok vydání:	2020
Předmět:	chemistry.chemical_compound Chemistry Optical limiting Knoevenagel condensation General Chemistry Z-scan technique BODIPY Free rotation Photochemistry
Zdroj:	Journal of Porphyrins and Phthalocyanines. 24:1129-1137
ISSN:	1099-1409 1088-4246
DOI:	10.1142/s1088424620500315
Popis:	The optical limiting properties of three meso-pentafluorophenylstyrylBODIPY dyes are investigated in the presence and absence of methyl groups at the 1,7-positions that hinder free rotation of the meso-aryl group. Pentafluorophenyl groups are introduced at the meso-position, while 4-diethylaminostyryl groups are introduced at the 3- and/or 5-positions to form dyes with strong donor-[Formula: see text]-acceptor (D-[Formula: see text]-A) properties to enhance the dipole moment of the molecule. Favorable optical limiting properties are obtained for all three dyes, with the highest second-order hyperpolarizability value obtained for a monostyryl dye with no methyl groups at the 1,7-position. Bromination at the 2,6-positions of a 1,7-methyl substituted dye is found to result in second-order hyperpolarizability that is an order of magnitude lower than that calculated for the analogous non-halogenated dye.
Databáze:	OpenAIRE
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