Dansyl conjugated tripodal AIEEgen for highly selective detection of 2,4,6-trinitrophenol in water and solid state

作者：Tripathi Neetu; Sandhu Sana; Singh Prabhpreet; Mahajan Aman; Kaur Manmeet; Kumar Subodh^*

来源：Sensors and Actuators B: Chemical , 2016, 231: 79-87.

DOI：10.1016/j.snb.2016.03.008

• Nitro-aromatic explosives
• Amplified fluorescence quenching
• Vapor detection
• Dansyl fluorophore
• AIEE
• 2,4,6-Trinitrophenol

TRIPOD-DNS, a dansyl conjugated tripod undergoes aggregation in solutions containing more than 50% water and exhibits 68% quantum efficiency in 98% aqueous medium. The aggregation of TRIPOD-DNS has been confirmed by dynamic light scattering (DLS), and transmission electron microscopic studies. In 98% aqueous medium, TRIPOD-DNS detects 2,4,6-trinitrophenol (TNP) in a highly selective manner amongst aromatic compounds and can detect as low as 10 pM TNP. Only 1% molecules of TNP quench 50% fluorescence intensity of the solution of TRIPOD-DNS and reveal amplified quenching of fluoresence of TRIPOD-DNS. Stern-Volmer constant (K-SV) determined by exponential equation (I/I-o = Ae(k[Q]) + B) is 1.57 x 10(9) M-1. The paper strips coated with TRIPOD-DNS can detect as low as 13.2 ag/cm(2) (13.2 x 10(-18) g/cm(2)) TNP both in qualitative and quantitative manner. H-1 NMR, DFT and life time measurement studies support static process and ground state electron transfer from HOMO of TNP to LUMO of TRIPOD-DNS responsible for fluorescence quenching.

• 出版日期2016-8