Two dysprosium-containing tungstoarsenates [C(NH2)3]11[Dy2(Hcit)2(AsW10O38)]·9H2O (1) and K8−nH3−n[Dy3−nKn(H2O)3(CO3)(A-α-AsW9O34)(A-β-AsW9O34)]·22H2O (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-AsW9O34]9− and [A-β-AsW9O34]9−, linked to each other via one {Dy3−nKn(H2O)3(CO3)}(7 − 2n)+ (n = 0 or 1) unit, where CO32− is encapsulated in the triangle plane, resulting in a stable dysprosium carbonate-containing sandwich-type polyoxoanion with D2h 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.
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