Add time:07/19/2019         Source:sciencedirect.com

The effect of 14 lanthanides on the structure and the electronic system of isonicotinic acid was studied using IR (KBr), IR (ATR), Raman, UV–Vis, spectrofluorometric, elemental analysis and thermogravimetric (TG/DTG) methods. The influence of the lanthanides ions on the electronic charge distribution of the ligand is discussed. The nephelauxetic parameters and the degree of covalency in the lanthanide–ligand bonds were established. Moreover, the molecular structures of the lanthanide complexes with isonicotinic, nicotinic, picolinic and benzoic acids were compared, with a particular emphasis on the changes within the aromatic ring of metal complexes.

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