A new colorimetric chemodosimeter for Hg2+ based on charge-transfer compound of N-methylpyrrole with TCNQ.
Reaction of N-methylpyrrole and 7,7,8,8-tetracyanoquinodimethane (TCNQ) furnishes an intense blue unsymmetrical charge-transfer compound through regioselective attachment of tricyanoquinodimethane at the 2-position of N-methylpyrrole which was found to be selective chemodosimeter for Hg(2+) ions in CH(3)CN:H(2)O mixture (1:1 v/v, pH=7.0, 0.01 M HEPES, 0.15M NaCl) as well as in the solid state when supported on silica, over a variety of metal ions. A plausible mechanism for the sensing process has been proposed and supported through the characterization of the resulting Hg(2+) complex and the density functional theory (DFT) studies.
Department of Chemistry, Guru Nanak Dev University, Amritsar, India. paramjit19in@yahoo.co.in
Paramjit
P
Kaur
Sandeep
S
Kaur
Yoganjaneyulu
Y
Kasetti
Prasad V
PV
Bharatam
Kamaljit
K
Singh
D003124:Colorimetry / Q000295:instrumentation* / Q000379:methods; D018360:Crystallography, X-Ray / Q000379:methods; D004583:Electrons; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D008767:Methylmercury Compounds / Q000737:chemistry; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D009570:Nitriles / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D011758:Pyrroles / Q000737:chemistry*; D012984:Software; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
D008767:Methylmercury Compounds; D009570:Nitriles; D011758:Pyrroles; C013703:tetracyanoquinodimethane; C073972:dimethyl mercury; D008628:Mercury; C096654:N-methylpyrrole; D010100:Oxygen