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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Substituent effects on novel lanthanide(III) hydrazides complexes

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Brandao, Samira G. [1] ; Ribeiro, Marcos A. [1] ; Perrella, V, Rafael ; de Sousa Filho, Paulo C. [2] ; Luz, Priscilla P. [1]
Total Authors: 5
[1] Univ Fed Espirito Santo, Dept Chem, BR-29075910 Vitoria, ES - Brazil
[2] Perrella, Rafael, V, Univ Estadual Campinas, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF RARE EARTHS; v. 38, n. 6, p. 642-648, JUN 2020.
Web of Science Citations: 0

New lanthanide (Eu3+ and Gd3+) complexes were successfully synthesized and the effect of the p-phenyl 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 Ln(3+) 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)(H2O)](NO3)(3)center dot(C2H2OH) and {[}Eu(toluic)(3)(H2O)](NO3)(3). Lower T-1 state energies are observed for ligands p-substituted with higher electron donating capacity groups, such as p-NH2 and p-OH. 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. (C) 2019 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 17/11764-2 - Strategies on the synthesis of luminescent nanomaterials for the design of new multimodal optical sensors
Grantee:Paulo Cesar de Sousa Filho
Support type: Regular Research Grants