NIR laser induced TPA enhancement of Zn(II)-terpyridine capped gold nanoparticles for targeting mitochondria
摘要:
Gold nanostructures have recently received increasing interest in bioimaging application. Herein, a novel nanostructure material was designed by the terminal sulfur of the S ((E)-3-(4-([2,2':6',2 ''-terpyridin]-4'-yl)styryl)-9-hexyl-9H-carbazole Zn(SCN)(2) complex) modified with Nano gold. It could be used to target mitochondria under two-photon laser confocal microscopy, due to the energy of laser irradiation gained from the absorbed photons to be dispersed as excess heat to the neighboring particles and thus to induce their fusion, compared with free complex. Furthermore, small size Nano-Au composite was synthesized with longer lifetime, larger two photon absorption cross section (sigma) and third order nonlinear optical susceptibility (chi((3))) in the near-infrared region (NIR), due to the laser irradiation induced charge transfer from complex to the gold nanoparticles, which attracting potential applications in vitro and in vivo cellular imaging. (C) 2016 Published by Elsevier Ltd.
Photophysical properties of spherical aggregations of CdS nanocrystals capped with a chromophoric surface agent
摘要:
一种新型硫端镉(II)络合物 CdS2L(L = N-己基-3-{2-[4-(2,2′:6′,2′′-三吡啶-4′-基)苯基]乙烯基}-咔唑),并通过单晶 X 射线衍射分析证实了这一点。对其光物理性质进行了实验和理论研究。以 L 为表面封端的新型杂化纳米粒子(CdS/L)聚集成大球体,表现出不同于纯 CdS 纳米晶体和游离 L 的新颖发光特性、强烈的双光子吸收(TPA)和明显的荧光寿命延长。
A novel sulfur-terminal Cd(II) complex, CdS2L (L = N-hexyl-3-2-[4-(2,2′:6′,2′′-terpyridin-4′-yl)phenyl]ethenyl}-carbazole), was successfully synthesized from CdS nanocrystals and the organic chromophores (L), which was confirmed by single-crystal X-ray diffraction analysis. Its photophysical properties have been investigated both experimentally and theoretically. The novel hybrid nanoparticles (CdS/L) were then obtained using the L as surface capped agent, which aggregate into large spheres, exhibiting novel luminescent properties, strong two photon absorption (TPA) and obvious prolonged fluorescence lifetime, which differ from those of the pure CdS nanocrystals and free L.
一种新型硫端镉(II)络合物 CdS2L(L = N-己基-3-2-[4-(2,2′:6′,2′′-三吡啶-4′-基)苯基]乙烯基}-咔唑),并通过单晶 X 射线衍射分析证实了这一点。对其光物理性质进行了实验和理论研究。以 L 为表面封端的新型杂化纳米粒子(CdS/L)聚集成大球体,表现出不同于纯 CdS 纳米晶体和游离 L 的新颖发光特性、强烈的双光子吸收(TPA)和明显的荧光寿命延长。
NIR laser induced TPA enhancement of Zn(II)-terpyridine capped gold nanoparticles for targeting mitochondria
Gold nanostructures have recently received increasing interest in bioimaging application. Herein, a novel nanostructure material was designed by the terminal sulfur of the S ((E)-3-(4-([2,2':6',2 ''-terpyridin]-4'-yl)styryl)-9-hexyl-9H-carbazole Zn(SCN)(2) complex) modified with Nano gold. It could be used to target mitochondria under two-photon laser confocal microscopy, due to the energy of laser irradiation gained from the absorbed photons to be dispersed as excess heat to the neighboring particles and thus to induce their fusion, compared with free complex. Furthermore, small size Nano-Au composite was synthesized with longer lifetime, larger two photon absorption cross section (sigma) and third order nonlinear optical susceptibility (chi((3))) in the near-infrared region (NIR), due to the laser irradiation induced charge transfer from complex to the gold nanoparticles, which attracting potential applications in vitro and in vivo cellular imaging. (C) 2016 Published by Elsevier Ltd.