Efficient diborane-mediated synthesis of phthalocyanines carrying amino groups near the macrocycle

The synthesis of novel zinc(II) phthalocyanines carrying amino and ammonium groups near the macrocycle were reported. These dyes showed a bathochromic shift as compared with their peripheral substituted analogs. [Display omitted] ► Novel zinc(II) phthalocyanines were synthesized. ► Cationic phthaloc...

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Bibliographic Details
Published in:Polyhedron 2012-10, Vol.46 (1), p.90-94
Main Authors: Gauna, Gabriela A., Cobice, Diego, Awruch, Josefina
Format: Article
Language:English
Subjects:
4-Aminophthalonitrile
Diborane
Photophysical properties
Reduction
Zinc(II) phthalocyanines
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Summary:The synthesis of novel zinc(II) phthalocyanines carrying amino and ammonium groups near the macrocycle were reported. These dyes showed a bathochromic shift as compared with their peripheral substituted analogs. [Display omitted] ► Novel zinc(II) phthalocyanines were synthesized. ► Cationic phthalocyanines are reported as potential mitochondrial targets. ► A bathochromic shift was observed in the absorption spectra. ► Photophysical parameters were investigated. N-(3,4-dicyanophenyl)piperidine-2,6-dione (2) and 4-phthalimidophthalonitrile (3) were synthesized in 24% and 74% yield respectively, using 4-aminophthalonitrile as the starting material. Treatment of 2 and 3 with zinc acetate in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene gave respectively phthalocyanines 4 and 5, whose reduction with diborane afforded dyes 6 and 7. Quaternization of 6 and 7 with iodomethane gave cationic zinc(II) phthalocyanines 8 and 9 respectively. A bathochromic shift was observed in the absorption spectra when amino and ammonium groups were present near the macrocycle in comparison with those dyes carrying alkylamino and quaternary alkyl ammonium salts as peripheral substituents.
ISSN:0277-5387
DOI:10.1016/j.poly.2012.07.089