Substituent effects on novel lanthanide(Ⅲ) hydrazides complexes  

作　　者：Samira G.Brandao Marcos A.Ribeiro Rafael V.Perrella Paulo C.de Sousa Filho Priscilla P.Luz 

机构地区：[1] Department of Chemistry,Federal University of Espirito Santo,29075-910,Vitoria,ES,Brazil [2] Institute of Chemistry,University of Campinas,PO Box 6154,13083-970,Campinas,SP,Brazil

出　　处：《Journal of Rare Earths》2020年第6期642-648,共7页稀土学报（英文版）

基　　金：the FAPESP(Fundacao de Amparo a Pesquisa de Sao Paulo)(2017/11764-2)。

摘　　要：New lanthanide(Eu3+ and Gd3+) complexes were successfully synthesized and the effect of the p-phe nyl substituent on the Eu3+luminescent properties was evaluated.In this sense,benzhydrazide,p-toluic hydrazide,4-hydroxybenzhydrazide and 4-aminobenzoic hydrazide were used as ligands and the complexes were obtained by mixing the lanthanide salts with hydrazides in ethanol at room temperature and keeping the reaction for 2 h under mechanical stirring.Crystal of Gd-amino was obtained and its structure was elucidated by single-crystal X-ray diffraction,revealing that Gd3+centered in a distorted tricapped trigonal-prismatic molecular geometry.IR spectroscopy and the elucidated structure confirm hydrazides acting as bidentate ligands binding to Ln3+ions through the oxygen of carbonyl group and the nitrogen of terminal amine,forming a five-membered ring,CHN analyses confirm the molecular formulas [Gd(amino)4(H2 O)](NO3)3·(C2 H5 OH) and [Eu(toluic)3(H2 O)3](NO3)3.Lower T1 state energies are observed for ligands p-substituted with higher electron donating capacity groups,such as p-NH2 and pOH.In contrast,higher lifetimes and quantum efficiencies are obtained for Eu3+complexes with ligands p-H and p-CH3 substituted,which are not deactivator groups.

关 键 词：LANTHANIDE HYDRAZIDE Substituent effect Photoluminescence EUROPIUM GADOLINIUM 

分 类 号：O641.4[理学—物理化学]