Two dysprosium-incorporated tungstoarsenates: synthesis, structures and magnetic properties.
Two dysprosium-containing tungstoarsenates [C(NH(2))(3)](11)[Dy(2)(Hcit)(2)(AsW(10)O(38))]·9H(2)O (1) and K(8-n)H(3-n)[Dy(3-n)K(n)(H(2)O)(3)(CO(3))(A-α-AsW(9)O(34))(A-β-AsW(9)O(34))]·22H(2)O (n = 0 or 1) (2) have been synthesized and characterized by single-crystal X-ray diffraction, elemental analyses, thermogravimetric analyses and infrared spectroscopy. Compound 1 is a citrate-decorated Keggin type di-substituted Ln/POM derivative with the two non-adjacent substituted sites occupied. Compound 2 is composed of two different trivacant Keggin unit isomers [A-α-AsW(9)O(34)](9-) and [A-β-AsW(9)O(34)](9-), linked to each other via one {Dy(3-n)K(n)(H(2)O)(3)(CO(3))}((7 - 2n)+) (n = 0 or 1) unit, where CO(3)(2-) is encapsulated in the triangle plane, resulting in a stable dysprosium carbonate-containing sandwich-type polyoxoanion with D(2h) symmetry. The investigation on both static and dynamic magnetic properties of 1 and 2 show that the magnetic relaxation behavior of 2 appear in a static magnetic field of 5000 Oe, while 1 shows no positive out-of-phase ac susceptibility.
Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun, Jilin 130024, PR China.
Fengyan
F
Li
Weihua
W
Guo
Lin
L
Xu
Lifang
L
Ma
Yuchao
Y
Wang
D001149:Arsenates / Q000737:chemistry*; D019343:Citric Acid / Q000737:chemistry; D018360:Crystallography, X-Ray; D004419:Dysprosium / Q000737:chemistry*; D060328:Magnetic Phenomena; D015394:Molecular Structure; D017973:Tungsten Compounds / Q000737:chemistry*
D001149:Arsenates; D017973:Tungsten Compounds; D004419:Dysprosium; D019343:Citric Acid