Synthesis and Properties of Salicyladehyde Salicyhydrazone Derivatives and Their Europium Complexes

• Published in: Journal of fluorescence 2014-11, Vol.24 (6), p.1661-1669
• Main Authors: Meng, Defen, Liu, Fen, Lian, Xiaomei, Yang, Zehui, Guo, Dongcai
• Format: Article
• Language: English
• Subjects: Aldehydes - chemistry; Analytical Chemistry; Biochemistry; Biological and Medical Physics; Biomedical and Life Sciences; Biomedicine; Biophysics; Biotechnology; Derivatives; Electrode potentials; Energy levels; Europium; Europium - chemistry; Exploration; Fluorescence; Hydrazones - chemistry; Models, Molecular; Molecular orbitals; Molecular Structure; Organometallic Compounds - chemical synthesis; Original Paper; Synthesis
• ISSN: 1053-0509; 1573-4994
• DOI: 10.1007/s10895-014-1453-5

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 (NO 3 ) 2 ](NO 3 ) · H 2 O. 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 (−CH 3 ) 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 (−CH 3 and −OCH 3 ) 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.