title: 2-(2-Pyridyl) benzimidazole based Co(II) complex as an efficient fluorescent probe for trace level determination of aspartic and glutamic acid in aqueous solution: a displacement approach.
abstract: A weakly fluorescent cobalt(II) complex is synthesized using 2-(2-pyridyl)-benzimidazole (PBI) as a chelating fluorescent ligand and characterized by single crystal X-ray structure. This complex serves as an efficient fluorescent probe for trace level determination of aspartic acid (AspA) and glutamic acid (GluA) in aqueous solution. Rest of the naturally occurring amino acids did not interfere. Both aspartic acid and glutamic acid replaces PBI from the coordination sphere of Co(II)-PBI complex resulting appearance of strong fluorescence signal for the released free PBI. The signal response is very fast and the interaction of both the AspA and GluA with the Co(II) is strong enough as evident from their displacement equilibrium constant values, viz. 4357.8 M(-1) and 8333.33 M(-1) respectively.
authors.affiliation: Department of Chemistry, The University of Burdwan, Burdwan, West Bengal, India.
authors.forename: Sudipta
authors.initials: S
authors.lastname: Das
authors.forename: Subarna
authors.initials: S
authors.lastname: Guha
authors.forename: Arnab
authors.initials: A
authors.lastname: Banerjee
authors.forename: Sisir
authors.initials: S
authors.lastname: Lohar
authors.forename: Animesh
authors.initials: A
authors.lastname: Sahana
authors.forename: Debasis
authors.initials: D
authors.lastname: Das
mesh_terms: D001224:Aspartic Acid / Q000737:chemistry*; D001562:Benzimidazoles / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D018698:Glutamic Acid / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D012996:Solutions / Q000737:chemistry
chemical_list: C479869:2-(2'-pyridyl)benzimidazole; D001562:Benzimidazoles; D005456:Fluorescent Dyes; D012996:Solutions; D001224:Aspartic Acid; D003035:Cobalt; D018698:Glutamic Acid