Abstract
A new red emitting sandwich-type phosphotungstate built on the lacunary Wells-Dawson polyanion [W-17(PO4)(1.75)O-52](10-) and trivalent rare earth ion, center dot 15 center dot 5H(2)O (1) has been synthesized and characterized by SEM-EDX, single crystal X-ray diffraction, and PL spectroscopy. It crystallizes in the monoclinic space group C2/c with unit cell dimensions a = 43.523(4) , b = 12.3522(6) , c = 29.4592(12) , beta = 100.933(6)A degrees, Z = 2 and 15,549.8(16) (3). The crystal structure has been determined and refined to R-1 and wR(2) were 0.0682 and 0.1652 respectively. In this polyanion, two symmetrical Eu-III cations sandwiched between C (2) symmetry related lacunary Wells-Dawson-like anions.