title: Fluorescence and co-fluorescence of Tb(3+) and Eu(3+) in acetonitrile using 2,6-pyridine dicarboxylic acid as ligand.
abstract: Fluorescence from Tb(3+) and Eu(3+) complexed with 2,6-pyridine dicarboxylic acid (PDA) has been studied using acetonitrile (MeCN) as solvent. The enhancement in fluorescence intensity because of non-aqueous environment provided by the MeCN is less significant, where as fluorescence enhancement of more than two orders of magnitude has been observed with the addition of La(3+); a process known as co-fluorescence in MeCN. The present study demonstrates for the first time co-fluorescence of Tb(3+) and Eu(3+) with excitation through the absorption of PDA. Intermolecular energy transfer is believed to be responsible for co-fluorescence enhancement and it becomes possible as the quenching due to water at the secondary coordination spheres of Tb(3+) and Eu(3+) is reduced when MeCN is used as solvent.
authors.affiliation: Material Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India. Electronic address: siuli@igcar.gov.in.
authors.forename: S
authors.initials: S
authors.lastname: Maji
authors.affiliation: Material Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India.
authors.forename: Satendra
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Material Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India.
authors.forename: K
authors.initials: K
authors.lastname: Sankaran
mesh_terms: D065966:Absorption, Physicochemical; D000097:Acetonitriles / Q000737:chemistry*; D002138:Calibration; D005063:Europium / Q000737:chemistry*; D008024:Ligands; D057230:Limit of Detection; D010848:Picolinic Acids; D011725:Pyridines / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013725:Terbium / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000097:Acetonitriles; D008024:Ligands; D010848:Picolinic Acids; D011725:Pyridines; D012997:Solvents; D014867:Water; D013725:Terbium; D005063:Europium; C004860:dipicolinic acid; C032159:acetonitrile
keywords: 2,6-Pyridine dicarboxylic acid; Acetonitrile; Co-fluorescence; Europium; Fluorescence; Terbium