New meso substituted cyanine dyes in the 2-R-5H-[1,2,4]triazolo[5,l-a] isoindole series

摘要

meso-Substituted symmetrical monomethine cyanine dyes derived from the triazoloisoindole were obtained by reaction of 2-R-5H-[1 ,2,4jtri-azolo[5,1-a]isoindoles with acyl chlorides.The meso group can be varied in a wide range enhancing the interest of these dyes like biological probes.Spectral UV-vis properties are reported.