ABSTRACT
A new probe (Z)-3-((naphthalen-1-ylmethylene)amino)phenol has been synthesized by condensation reaction between 1-naphthaldehyde and 3-aminophenol for the fluorescent sensing of Ce3+ by "on" mode and dichromate (Cr2O72-) by "off" mode. Metal ions-Ag+, Al3+, As3+, Ba2+, Ca2+, Cd2+, Ce4+, Co2+, Cr3+, Cr6+, Cu2+, Fe2+, Fe3+, Hg2+, K+, La+, Li+, Mg2+, Mn2+, Na+, Ni2+, Pb2+, Zn2+and anions Br-, C2O42-, CH3COO-, Cl-, CO32-, F-, H2PO4-, HCO3-, HF2-, HPO42-, I-, MnO4-, NO3-, OH-, S2-, S2O32-, SCN-, SO42- do not interfere. The limit of detection (LOD) for sensing Ce3+ and Cr2O72- ions are 1.286 × 10-7 M and 6.425 × 10-6 M, respectively.
Subject(s)
Fluorescent Dyes , Naphthalenes , Aldehydes , Aminophenols , IonsABSTRACT
Enantiodiscrimination and their quantification using nuclear magnetic resonance (NMR) spectroscopy has always been a subject of great interest. Proton is the nucleus of choice for enantiodiscrimination due to its high sensitivity and ubiquitous presence in nature. Despite its advantages, enantiodiscrimination suffers from extensive signal splitting by the proton-proton scalar couplings, which give complex multiplets that spread over a frequency range of some tens of hertz. These multiplets often overlap, further complicating interpretation of the spectra and quantifications. In the present review, we discuss some of the recent developments in the pure shift 1 H NMR based methods for enantiomer resolution and enantiodiscrimination. We also compare various pure shift methods used for enantiodiscrimination and measurement of enantiomeric excess, considering the fact that conventional 1 H NMR fails to provide any detailed insight.
