Department of Chemistry, Rhodes University, Grahamstown, South Africa.
Dalton Trans. 2011 Nov 28;40(44):11876-84. doi: 10.1039/c1dt11151e. Epub 2011 Oct 5.
This work reports on the synthesis, characterization and photophysical studies of phthalocyanine-gold nanoparticle conjugates. The phthalocyanine complexes are: tris-(5-trifluoromethyl-2-mercaptopyridine)-2-(carboxy)phthalocyanine (3), 2,9,17,23-tetrakis-[(1, 6-hexanedithiol) phthalocyaninato]zinc(II) (8) and [8,15,22-tris-(naptho)-2(amidoethanethiol) phthalocyanato] zinc(II)(10). The gold nanoparticles were characterized using transmission electron microscopy, X-ray diffraction, atomic force microscopy and UV-vis spectroscopy where the size was confirmed to be ∼5 nm. The phthalocyanine Au nanoparticle conjugates showed lower fluorescence quantum yield values with similar fluorescence lifetimes compared to the free phthalocyanines. The Au nanoparticle conjugates of 3 and 10 also showed higher triplet quantum yields of 0.69 to 0.71, respectively. A lower triplet quantum yield was obtained for the conjugate compared to free phthalocyanine for complex 8. The triplet lifetimes ranged from 70 to 92 μs for the conjugates and from 110 to 304 μs for unbound Pc complexes.
这项工作报道了酞菁-金纳米粒子缀合物的合成、表征和光物理研究。酞菁配合物为：三-(5-三氟甲基-2-巯基吡啶)-2-(羧基)酞菁（3）、2,9,17,23-四-[(1,6-己二硫醇)酞菁inato]锌（8）和[8,15,22-三-(萘)-2(酰胺乙硫醇)酞菁ato]锌（10）。金纳米粒子通过透射电子显微镜、X 射线衍射、原子力显微镜和紫外可见光谱进行了表征，其尺寸被证实约为 5nm。与游离酞菁相比，酞菁金纳米粒子缀合物的荧光量子产率值较低，但荧光寿命相似。3 和 10 的金纳米粒子缀合物的三重态量子产率分别为 0.69 至 0.71。与游离酞菁相比，配合物 8 的共轭物的三重态量子产率较低。对于缀合物，三重态寿命范围为 70 至 92μs，对于未结合的 Pc 配合物，三重态寿命范围为 110 至 304μs。
