title: Synthesis and properties of salicyladehyde salicyhydrazone derivatives and their europium complexes.
abstract: Four novel salicyladehyde salicyhydrazone derivatives and their corresponding europium (Eu(3+)) complexes were synthesized and characterized. The formulas of the complexes were [EuL(a-d)(NO3)2](NO3) · H2O. The investigatoin of fluoresence properties of the Eu(3+) complexes showed that the salicyladehyde salicyhydrazone derivatives were efficient sensitizers for the fluoresence of Eu(3+) ions. The fluorescence intensity of the complex substituted by methyl (-CH3) was the strongest among all the Eu(3+) complexes. The exploration of the electrochemical properties of the Eu(3+) complexes showed that the introduction of electron-donating groups methyl and methoxyl (-CH3 and -OCH3) could increase the oxidation potential and the highest occupied molecular orbital (HOMO) energy level of the Eu(3+) complex; however, the results of introduction of electron-withdrawing group were just opposite.
authors.affiliation: School of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
authors.forename: Defen
authors.initials: D
authors.lastname: Meng
authors.forename: Fen
authors.initials: F
authors.lastname: Liu
authors.forename: Xiaomei
authors.initials: X
authors.lastname: Lian
authors.forename: Zehui
authors.initials: Z
authors.lastname: Yang
authors.forename: Dongcai
authors.initials: D
authors.lastname: Guo
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D006835:Hydrazones / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis*
chemical_list: D000447:Aldehydes; D006835:Hydrazones; D009942:Organometallic Compounds; C013243:salicylaldehyde; D005063:Europium