A new molybdenum(V) phosphate with a tunnel: Hydrothermal synthesis and characterization of (C_2N_2H_(10))_6[Na_2Mo_(12)O_(31)(PO_4)(HPO_4)_2(H_2PO_4)_5] centre dot 4H_2O

摘要

A new molybdenum phosphate, (C_2N_2H_(10))_6[Na_2Mo_(12)O_(31)(PO_4)(HPO_4)_2(H_2PO_4)_5] centre dot 4H_2O has been synthesized under hydrothermal conditions and structurally determined by single-crystal X-ray diffraction method. It has the following crystal data: triclinic space group P-1, a = 12.0117(4) A, b = 14.5565(5) A, c = 21.2805(8) A, alpha = 80.6530(10), beta = 82.6410(10), gamma = 76.2610(10), V= 3550.8(2) A~3, Z=2. The structure of the title compound may be considered to be two [Mo_6O_(15) (HPO_4)(H_2PO_4)_3]~(5-) units bonded together with sodium atom, although several P-O groups are not protonated on account of coordination to a Na~+ cation. The one-dimensional tunnels were formed in the solid state structure. The structure is stabilized by template-to-framework hydrogen bonding. The title compound was also characterized by IR spectroscopy and TG-DTA. Luminescent measurement of the title compound shows an emission band between 724 and 747 nm when excited with 491 nm UV light.