Single-molecule magnets within polyoxometalate-based frameworks

被引：37

作者：

Zarch, Malihe Babaei ^{[1
]}

Mirzaei, Masoud ^{[1
]}

Bazargan, Maryam ^{[1
]}

Gupta, Sandeep K. ^{[2
]}

Meyer, Franc ^{[2
]}

Mague, Joel T. ^{[3
]}

机构：

[1] Ferdowsi Univ Mashhad, Fac Sci, Dept Chem, Mashhad 9177948974, Razavi Khorasan, Iran

[2] Georg August Univ Gottingen, Inst Anorgan Chem, Tammannstr 4, D-37077 Gottingen, Germany

[3] Tulane Univ, Dept Chem, New Orleans, LA 70118 USA

来源：

DALTON TRANSACTIONS | 2021年 / 50卷 / 42期

基金：

美国国家科学基金会;

关键词：

Hydrothermal synthesis - Fourier transform infrared spectroscopy - Terbium compounds - Thermogravimetric analysis - Hydrogen bonds - Magnets - Oxides - X ray diffraction;

D O I：

10.1039/d1dt01708j

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

As an extension of our interest in polyoxometalates (POMs) and lanthanoids, we report the design and synthesis of two polyoxometalate-based frameworks under hydrothermal conditions; [Ho-4(PDA)(4)(H2O)(11)][(SiO4)@W12O36]center dot 8H(2)O (1) and [Tb-4(PDA)(4)(H2O)(12)][(SiO4)@W12O36]center dot 4H(2)O (2) (H(2)PDA = 1,10-phenanthroline-2,9-dicarboxylic acid). Both hybrids have been characterized by elemental analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and powder/single-crystal X-ray diffraction. According to the structural analysis, 1 and 2 consist of 2D-cationic coordination polymers based on the respective lanthanoids and PDA(2-) as well as Keggin anions that reside in the interspaces between two adjacent layers as discrete counterions connected by extensive hydrogen bonding. Although the overall structures of 1 and 2 are composed of cationic and anionic layers, there are many differences in the cationic layers such as various coordination modes of PDA(2-), different void shapes, and the existence of dinuclear Tb(III) units only in 2. Frameworks 1 and 2 were further characterized by dc and ac magnetic measurements and both exhibit slow relaxation of magnetization at low temperatures under an applied dc field. Their single-molecule magnet (SMM) properties are investigated, where weak field-induced SMM behaviour is observed at low temperatures in dynamic magnetic studies.

引用

页码：15047 / 15056

页数：10