Synthesis, Structure, and Spectroscopic Properties of the New Lanthanum(III) Fluoride Oxomolybdate(VI) La3FMo4O16

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European Journal of Inorganic Chemistry, (2010)
DOI: 10.1002/ejic.200901052


La3FMo4O16 crystallizes in the triclinic crystal system with space group P1̅ a 724.86(2), b 742.26(2), c 1469.59(3) pm, a 101.683(2), b 102.118(2), g 100.279(2)° with two formula units per unit cell. The three crystallog. independent La3+ cations show a coordination no. of nine each, with one F- and eight O2- anions forming distorted monocapped square antiprisms. The fluoride anion is coordinated by all three lanthanum cations to form a nearly planar triangle. Besides three crystallog. independent tetrahedral MoO42- units, a fourth one with a higher coordination no. (CN = 4 +1) can be found in the crystal structure, forming a dimeric entity with a formula of Mo2O84- consisting of two edge-connected square pyramids. Several spectroscopic measurements were performed on the title compd., such as IR, Raman, and diffuse reflectance spectroscopy. Furthermore, La3FMo4O16 was studied for its capacity to work as host material for doping with luminescent active cations, such as Ce3+ or Pr3+. Therefore, luminescence spectroscopic as well as EPR measurements were performed with doped samples of La3FMo4O16. Both the pure and the doped compds. can be synthesized by fusing La2O3, LaF3 and MoO3 (ratio 4:1:12; $\sim$1\% CeF3 and PrF3 as dopant, resp.) in evacuated silica ampuls at 850° for 7 d. on SciFinder(R)



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