Gold nanoparticles modified by new conjugated S=C=N terminal and its biological imaging application

Abstract

Gold nanostructures had recently become the most interesting areas of scientific endeavor. Herein, a novel nanostructure material was designed by S1 (2, 2': 6′, 2″-terpyridyl derivative Zn(SCN)2 complex) modified gold nanoparticles with obvious improving two photon absorption (TPA) cross section (σ), the fluorescence intensity, lifetime, fluorescence quantum yield due to the enhancement of intramolecular charge transfer (ICT) process. Compared with R1 (3-([2, 2': 6′, 2″-terpyridin]-4'-yl) -9-hexyl-9H-carbazole), a conjugated ligand of carbazolyl styryl terpyridine derivatives, capping with Ag nanoparticles, photon induced electron transfer (PET) process led to the fluorescence quenching. The 1H NMR study on the coordination reaction mechanism provided a new insight into the great mystery of nanoscience. Other related characterizations, such as IR and Far IR, could also prove the interaction of Au NPs and S1. The composite material with good nonlinear optical properties had potential applications in vitro cellular imaging.