Syntheses, crystal structure and magnetocaloric effect of [Gd(PDOA)(NO3)(H2O)2]n

被引:3
作者
Cernak, Juraj [1 ]
Harcarova, Katarina [1 ]
Ulicny, Martin [2 ]
Tarasenko, Robert [2 ]
Orendac, Martin [2 ]
Falvello, Larry R. [3 ]
机构
[1] PJ Safarik Univ Kosice, Fac Sci, Dept Inorgan Chem, Moyzesova 11, Kosice 04154, Slovakia
[2] PJ Safarik Univ Kosice, Inst Phys, Pk Angelinum 9, Kosice 04154, Slovakia
[3] Univ Zaragoza, CSIC, ICMA, Dept Quim Inorgan, Pedro Cerbuna 12, E-50009 Zaragoza, Spain
关键词
Gd(III) complex; Crystal structure; One-dimensional; o-Phenylenedioxydiacetato ligand; Magnetocaloric effect; COMPLEXES; POLYMERS;
D O I
10.1016/j.molstruc.2017.02.028
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The coordination polymer [Gd(PDOA)(NO3)(H2O)(2)](n) (1) (PDOA = o-phenylenedioxydiacetato) has been prepared and spectroscopically and structurally characterized. Its crystal structure is formed of a ribbonlike arrangement of Gd(III) atoms linked by bridging carboxylate groups and placed at the cusps of fused triangles with Gd center dot center dot center dot Gd distances of about 6.1 angstrom. The Gd(III) central atoms exhibit decacoordination by oxygen atoms from hexadentate PDOA ligands with chelating and bridging functions, a chelating nitrato ligand and two aqua ligands. Intra- and intermolecular hydrogen bonds of the O-H center dot center dot center dot O and C-H center dot center dot center dot O types contribute to the stability of the structure. The temperature dependence of the magnetic susceptibility revealed weak magnetic interactions among Gd(III) ions which may be attributed to dipolar coupling. Investigation of the magnetocaloric effect gives an estimate of the maximum value of isothermal change of magnetic entropy -Delta Sm approximate to 35 J kg(-1) K-1 which suggests that I can be a good material for magnetic cooling at low temperatures. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:179 / 185
页数:7
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