title: Synthesis and characterization of bis[N'-(4-carboxybenzylidene)]-pyridine-2,6-dicarbohydrazide: colorimetric and fluorometric modulation in presence of F- ions.
abstract: A novel organic compound bis[N'-(4-carboxybenzylidene)]-pyridine-2,6-dicarbohydrazide (L) was synthesized and characterized using spectroscopic and X-ray diffraction techniques. Tetrabutyl ammonium halides [(Bu)4N(+)X(-)] X = F, Cl, Br and I were allowed to react separately with a solution of L in DMSO (1 × 10(-5)M). The solution of L turned to shining yellow colour in the presence of F(-) ion only. The binding properties have been studied using absorption, emission and (1)H NMR titrations. Theoretical studies on compound L and compound L+X(-) (X = F, Cl and Br) in DMSO medium were carried out using density functional theory (DFT) at the B3LYP/6-31 G(d,p)/6-31 G+(d,p) level. The theoretical calculations agreed to the experimental results.
authors: Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221 005, India.
authors: Priti
authors: P
authors: Sinha
authors: Ashish Kumar
authors: AK
authors: Srivastava
authors: Lallan
authors: L
authors: Mishra
mesh_terms: D000838:Anions / Q000737:chemistry; D001597:Benzylidene Compounds / Q000737:chemistry*; D003124:Colorimetry; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D005461:Fluorine / Q000737:chemistry; D006834:Hydrazines / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D011725:Pyridines / Q000737:chemistry*; D011789:Quantum Theory
chemical_list: D000838:Anions; D001597:Benzylidene Compounds; D006834:Hydrazines; D011725:Pyridines; D005461:Fluorine; C019289:carbohydrazide; D004121:Dimethyl Sulfoxide
keywords: Bis-carbohydrazide; Colorimetry; DFT calculations; Fluorometry; NMR titrations