Axial coordination of zinc and silicon phthalocyanines to silver and gold nanoparticles: an investigation of their photophysicochemical and antimicrobial behavior

被引:30
作者
Masilela, Nkosiphile [1 ]
Antunes, Edith [1 ]
Nyokong, Tebello [1 ]
机构
[1] Rhodes Univ, Dept Chem, ZA-6140 Grahamstown, South Africa
基金
新加坡国家研究基金会;
关键词
Staphylococcus aureaus; Bacillus subtilis; silver nanoparticles; gold nanoparticles; phthalocyanines; singlet oxygen quantum yields; PHOTOCHEMICAL PROPERTIES; CARBOXY PHTHALOCYANINES; SINGLET OXYGEN; QUANTUM YIELDS; PHOTOSENSITIZERS; FLUORESCENCE; SUBSTITUENTS; ENHANCEMENT; RESISTANCE; SOLVENTS;
D O I
10.1142/S1088424613500016
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
This work reports on the axial coordination of zinc phthalocyanine and bis-(1,6-hexanedithiol) silicon phthalocyanine to silver and gold nanoparticles. Red shifting of absorption spectra of the phthalocyanine complexes was observed after conjugation with the nanoparticles. An improvement in the photophysicochemical behavior and antimicrobial activity was achieved in the presence of metal nanoparticles for both complexes. A decrease in triplet lifetimes was observed for all the phthalocyanine metal nanoparticle conjugates. The Zn phthalocyanine complex gave the highest triplet and singlet oxygen quantum yield in the presence of gold nanoparticles. On the other hand, the bacterial inhibition was found to be best for the Si phthalocyanine derivative in the presence of nanoparticles compared to the Zn phthalocyanine counterpart. The highest antimicrobial activity was achieved for both conjugates against B. subtilis compared to S. aureaus both in the dark and under illumination with light.
引用
收藏
页码:417 / 430
页数:14
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