Quenching luminescence,thermolysis and SMM behavior of new Tb^(Ⅲ),Eu^(Ⅲ),Gd^(Ⅲ) complexes with 4-nitro-N'-(pyridin-2-ylmethylene)benzohydrazide  

作　　者：Natalia V.Gogoleva Anna K.Matiukhina Mikhail T.Metlin Ilya V.Taydakov Leonid D.Popov Pavel G.Morozov Konstantin A.Babeshkin Nikolay N.Efimov Ekaterina N.Zorina-Tikhonova Mikhail A.Kiskin Igor L.Eremenko 

机构地区：[1]n.s.kurnakov institute of general and inorganic chemistry,russian academy of sciences,leninskii prosp.31,moscow,119991,russia [2]p.n.lebedev physical institute,russian academy of sciences,leninskii prosp.53,moscow,119333,russia [3]v.plekhanov russian university of economics,stremyanny lane,36,moscow,109992,russia [4]department of chemistry,southern federal university,zorge st.7,rostov-on-don,344090,russia

出　　处：《Journal of Rare Earths》2025年第4期660-668,I0001,共10页稀土学报(英文版)

基　　金：supported by the Russian Science Foundation (2273-10199)。

摘　　要：The reaction of 4-nitro-N'-(pyridin-2-ylmethylene)benzohydrazide(HL) with Ln(OAc)_(3)·4H_(2)O in MeOH makes it possible to synthesize mononuclear complexes [Ln(L)_(2)(OAc)(MeOH)]·2H_(2)O(Ln=Tb^(Ⅲ)(1),Eu^(Ⅲ)(2) and Gd^(Ⅲ)(3)) with chelate acetate and L^(-)anions.Compound 1 can be crystallized in reaction with molar ratio HL:Ln=1:1,2:1,3:1,and we successfully synthesized complex with three chelate L anions[Tb(L)_(3)]_(2)·2MeOH·H_(2)O(4) by interaction of TbCl_(3)·6H_(2)O with deprotonated HL(HL:Ln=3:1).Terbium(Ⅲ) compound 1 starts to decompose at~323 K and becomes stable up to 552 K according to the STA.Compound 1 shows slow magnetic relaxation with parameters Δ_(eff)/k_B=(6.75±0.02) K,τ_(0)=(1.71 × 10^(-6)±1 × 10^(-8)) s.Complexes 1 and 2 exhibit only fluorescence and phosphorescence of the L^(-).Ion-centered luminescence of the Tb^(3+)or Eu^(3+)ion is not observed.Using the tangent method at the high-energy edge of the phospho rescence spectrum of Gd^(3+),complex 3 T_(1) energy level of L^(-)is estimated to be 19700 cm^(-1).Reasons of luminescence quenching are discussed.Structures of 1 and 4 were determined by single crystal X-ray diffraction,and compounds 1-3 were characterized by powder X-ray diffraction(PXRD).

关 键 词：Complex Lanthanide(Ⅲ)ions LUMINESCENCE Magnetic properties Acylhydrazone ligands Rare earths 

分 类 号：O614.3[理学—无机化学]