Photolytic changes in the morphology of porphyrin-phthalocyanine nanostructures (P-PcNs) in the presence of platinum and gold salts

Porphyrin-phthalocyanine nanostructures (P-PcNs) have been fabricated by electrostatic self-assembly of two oppositely charged molecules. The negatively charged molecule, meso-tetra-(4-phenylsulphonate)porphyrin (HT) and the positively charged species; {1,(4)-tetrakis-[(N-methyl(3-pyridyloxy) phthlocyaninato] chloro gallium(III)} sulphate, {2,(3)-tetrakis-[(N-methyl{(2-mercaptopyridine) phthalocyaninato} hydroxy manganese(III)} sulphate, {1,(4)-tetrakis-[(N-methyl-(3-pyridyloxy) phthalocyaninato] chloro indium(III)} sulphate, {2,3-octakis-{[(N-methyl-2-mercaptopyridine) phthalocyaninato] acetato manganese(III)} sulphate, {2,(3)-tetrakis-[(N-methyl(3-pyridyloxy) phthlocyaninato] choro gallium(III)} sulphate, {2,3-octakis-[(N-methy-3-pyridyloxy) phthalocyaninato] chloro indium(III)} sulphate, and {2,(3)-tetrakis-[(N-methyl (3-pyridyloxy) phthalocyaninato] chloro indium(III)} sulphate. Transmission electron microscopic (TEM) images showed that the formed nanostructures ranged from nanosheets to nanorods and nanotubes. The UV-Vis spectra confirmed that the molecules formed J-aggregates. The P-PcNs were exposed to incandescence light in the presence of platinum and gold salts. It was observed that the presence of platinum salts resulted in the destruction of the P-PcNs with possible formation of a Pt-Pc complex. While with the gold salt, the structures of P-PcNs were not only retained but were also enhanced to longer nanorods and nanofibers with the formation of gold nanoparticles.

卟啉-酞菁纳米结构（Porphyrin-phthalocyanine nanostructures, P-PcNs）通过两种带相反电荷的分子经静电自组装制备得到。其中带负电的分子为中位-四-(4-苯磺酸盐)卟啉（meso-tetra-(4-phenylsulphonate)porphyrin, HT），带正电的物种包括：{1,(4)-四-[(N-甲基(3-吡啶氧基)酞菁合]氯化镓(III)}硫酸盐、{2,(3)-四-[(N-甲基{(2-巯基吡啶)酞菁合}羟基锰(III)}硫酸盐、{1,(4)-四-[(N-甲基-(3-吡啶氧基)酞菁合]氯化铟(III)}硫酸盐、{2,3-八-{[(N-甲基-2-巯基吡啶)酞菁合]乙酸锰(III)}硫酸盐、{2,(3)-四-[(N-甲基(3-吡啶氧基)酞菁合]氯化镓(III)}硫酸盐、{2,3-八-[(N-甲基-3-吡啶氧基)酞菁合]氯化铟(III)}硫酸盐，以及{2,(3)-四-[(N-甲基(3-吡啶氧基)酞菁合]氯化铟(III)}硫酸盐。透射电子显微镜（Transmission electron microscopy, TEM）成像结果显示，所制备的纳米结构形貌涵盖纳米片、纳米棒与纳米管。紫外-可见（UV-Vis）光谱表征证实，这些分子形成了J-聚集体。将P-PcNs置于铂盐与金盐共存的体系中，暴露于白炽灯光环境下。实验观测到，铂盐的存在会导致P-PcNs发生降解，并可能生成Pt-酞菁配合物；而在金盐体系中，P-PcNs的结构不仅得以完整保留，还进一步生长为更长的纳米棒与纳米纤维，同时伴随金纳米颗粒的生成。