Colorimetric and fluorometric chemosensors for selective signaling toward Ca2+ and Mg2+ by aza-crown ether acridinedione-functionalized gold nanoparticles
作者:Ranganathan Velu、Vayalakkavoor T. Ramakrishnan、Perumal Ramamurthy
DOI:10.1016/j.tetlet.2010.06.041
日期:2010.8
The aza-crown ether acridinedione-functionalized gold nanoparticles (ACEADD-GNPs) 6 have been synthesized and investigated as a fluorescent chemosensor for metal ions A blue shift along with an intensity enhancement of emission and color change are observed in the presence of both Ca2+ and Mg2+ ions The enhanced fluorescence intensity is attributed to the photoinduced electron transfer (PET) suppression through space and color change of the suspension from red to blue due to shifted surface plasmon resonance (SPR) with aggregation of nanoparticles by the sandwich complexation (c) 2010 Elsevier Ltd All rights reserved
Selective fluoride ion recognition by a thiourea based receptor linked acridinedione functionalized gold nanoparticles
作者:R. Velu、V.T. Ramakrishnan、P. Ramamurthy
DOI:10.1016/j.jphotochem.2010.10.025
日期:2011.1
The design and synthesis of acridinedione functionalized gold nanoparticles based PET anion sensor 6 is described. The sensor 6 employs simple aromatic thiourea as anion receptors and the fluorophore is the acridinedione moiety, which were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), UV-vis, steady-state and time-resolved fluorescence techniques. Upon selective recognition of F in acetonitrile, the fluorescence emission of 6 was quenched with significant changes in the absorption spectrum. These changes are ascribed due to the hydrogen bonding and deprotonation of the thiourea receptor of ADDTU-GNPs. (C) 2010 Elsevier B.V. All rights reserved.