Investigation of slow magnetic relaxation in a series of 1D polymeric cyclobutane-1,1-dicarboxylates based on LnIIIV2IV units (LnIII = Tb, Dy, Ho, Er, Tm, Yb): rare examples of VIV-4f single-molecule magnets

被引：0

作者：

Bazhina, Evgeniya S. ^{[1
]}

Shmelev, Maxim A. ^{[1
]}

Gogoleva, Natalia V. ^{[1
]}

Babeshkin, Konstantin A. ^{[1
]}

Kurganskii, Ivan V. ^{[2
]}

Efimov, Nikolay N. ^{[1
]}

Fedin, Matvey V. ^{[2
]}

Kiskin, Mikhail A. ^{[1
]}

Eremenko, Igor L. ^{[1
]}

机构：

[1] Russian Acad Sci, NS Kurnakov Inst Gen & Inorgan Chem, Leninsky Prosp 31, Moscow 119991, Russia

[2] Russian Acad Sci, Int Tomog Ctr, Siberian Branch, Inst Skaya St 3a, Novosibirsk 630090, Russia

来源：

DALTON TRANSACTIONS | 2024年 / 53卷 / 45期

关键词：

ELECTRON-SPIN-ECHO; COORDINATION POLYMERS; CRYSTAL-STRUCTURES; CU-II; COMPLEXES; LANTHANIDE; ION; LN; ENHANCEMENT; DYSPROSIUM;

D O I：

10.1039/d4dt01779j

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The reactions of VOSO4 center dot 3H(2)O with Na-2(cbdc) (cbdc(2-) - dianion of cyclobutane-1,1-dicarboxylic acid) and lanthanide(III) nitrates taken in a molar ratio of 1 : 2 : 1 were found to yield a series of isostructural heterometallic compounds [NaLn(VO)(2)(cbdc)(4)(H2O)(10)](n) (1(Ln), Ln = Tb, Dy, Ho, Er, Tm, Yb). These compounds are constructed from trinuclear anionic units [Ln(VO)(2)(cbdc)(4)(H2O)(8)](-) ({LnV(2)}(-)) linked by Na+ ions into 1D polymeric chains. The crystal structures of 1(Dy) and 1(Er) were determined by single-crystal X-ray diffraction (XRD), and their isostructurality with 1(Tb), 1(Ho), 1(Tm), and 1(Yb) was proved by powder X-ray diffraction (PXRD). According to alternating current (ac) magnetic susceptibility measurements, 1(Dy), 1(Er), and 1(Yb) exhibited field-induced slow relaxation of magnetization. Compound 1Er is the first representative of Er-III-V-IV single-molecule magnets. Measuring the temperature dependences of the phase memory time (T-m) for 1(Dy) and 1(Yb) using pulsed EPR spectroscopy allowed us to observe the phenomenon of phase relaxation enhancement (PRE) at temperatures below 30 K. In future, this phenomenon may contribute to the evaluation of relaxation times of the lanthanide ions.

引用

页码：18161 / 18174

页数：14