Highly Sensitive and Selective Colorimetric and Off-On Fluorescent Reversible Chemosensors for Al3+ Based on the Rhodamine Fluorophore

Sensors

Naveen Mergu¹  Ashok Kumar Singh¹  Vinod Kumar Gupta¹ 

[1] Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India; E-Mails:

关键词: chemosensor;    rhodamine;    colorimetric;    fluorescence;    naked-eye detection;   

DOI  :  10.3390/s150409097

来源: mdpi

【 摘 要 】

A series of rhodamine derivatives L1–L3 have been prepared and characterized by IR, ¹H-NMR, ¹³C-NMR and ESI-MS. These compounds exhibited selective and sensitive “turn-on” fluorescent and colorimetric responses to Al³⁺ in methanol. Upon the addition of Al(III), the spiro ring was opened and a metal-probe complex was formed in a 1:1 stoichiometry, as was further confirmed by ESI-MS spectroscopy. The chemo-dosimeters L1–L3 exhibited good binding constants and low detection limits towards Al(III). We also successfully demonstrate the reversibility of the metal to ligand complexation (opened ring to spirolactam ring).

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.