Behavior of aluminum(III)-tetra-15-crown-5-phthalocyaninates in organic media by fluorescence and UV-visible spectroscopy

Abstract

The results of a UV-vis and fluorescent spectral investigation of a tetra-15-crown-5-substituted aluminum phthalocyanine [ (R4Pc)Al(OH) ] (1), where (R4Pc)2- = 2,3,9,10,16,17,24,25-tetrakis(15-crown-5)phthalocyaninate-dianion, in different solvents (CHCl3, DMSO, MeOH) are reported. It was shown that compound exhibits a very strong tendency to aggregation with the formation of μ-fluoro dimer [((R4Pc)Al)2F]+ in the presence of F - in the low-donor solvent CHCl3 . This complex is not emissive. The formation of two different emissive species [(R4Pc)AlF2]- and [(R4Pc)Al(OH)2]- during the reaction of 1 with anions ( F - and OH - correspondently) in high-donor DMSO was established.