School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India.
J Colloid Interface Sci. 2010 Apr 15;344(2):596-602. doi: 10.1016/j.jcis.2010.01.022. Epub 2010 Jan 18.
The photoinduced interaction of TGA capped CdTe quantum dots (QDs) with porphyrins such as meso-tetrakis(4-sulfonatophenyl)porphyrin [TSPP], meso-tetrakis(4-carboxyphenyl)porphyrin [TCPP], meso-tetrakis (4-N-methylpyridyl)porphyrin [TMPyP] and meso-tetraphenylporphyrin [TPP] has been studied by using absorption, steady state and time resolved fluorescence spectroscopy. The QD surface was negatively charged due to thiol capping agent containing carboxylic group. Positively charged TMPyP interacts with QDs through charge transfer mechanism, negatively charged porphyrins (TCPP and TSPP) interacted through energy transfer mechanism and the neutral one (TPP) does not have any interaction. The Stern-Volmer constant, quenching rate constant, association constants, rate of electron transfer and energy transfer parameters were calculated from the fluorescence data. Effect of molecular structure has also been studied.
采用吸收光谱、稳态荧光光谱和时间分辨荧光光谱研究了巯基乙酸（TGA）稳定的 CdTe 量子点（QDs）与卟啉类化合物（meso-四（4-磺基苯基）卟啉[TSPP]、meso-四（4-羧基苯基）卟啉[TCPP]、meso-四（4-N-甲基吡啶基）卟啉[TMPyP]和 meso-四苯基卟啉[TPP]）的光诱导相互作用。由于含巯基的羧酸配体，QD 表面带负电荷。带正电荷的 TMPyP 通过电荷转移机制与 QDs 相互作用，带负电荷的卟啉（TCPP 和 TSPP）通过能量转移机制相互作用，而中性的卟啉（TPP）则没有相互作用。根据荧光数据计算了 Stern-Volmer 常数、猝灭速率常数、结合常数、电子转移速率和能量转移参数。还研究了分子结构的影响。
