A comparative photophysicochemical study of phthalocyanines encapsulated in core-shell silica nanoparticles

作者：Fashina Adedayo; Amuhaya Edith; Nyokong Tebello^*

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2015, 137: 294-299.

DOI：10.1016/j.saa.2014.08.062

• Silica matrix
• Core-shell
• Triplet quantum yields
• Carboxyphenoxy phthalocyanine

This work presents the synthesis and characterization of a new zinc phthalocyanine complex tetrasubstituted with 3-carboxyphenoxy in the peripheral position. The photophysical properties of the new complex are compared with those of phthalocyanines tetra substituted with 3-carboxyphenoxy or 4-carboxyphenoxy at non-peripheral positions. Three phthalocyanine complexes were encapsulated within silica matrix to form a core shell and the hybrid nanoparticles particles obtained were spherical and mono dispersed. When encapsulated within the silica shell nanoparticles, phthalocyanines showed improved triplet quantum yields and singlet oxygen quantum yields than surface grafted derivatives. The improvements observed could be attributed to the protection provided for the phthalocyanine complexes by the silica matrix.

• 出版日期2015-2-25