A chromic molybdenum phosphate with a tunnel structure:hydrothermal synthesis and structure of (NH_3CH_2CH_2NH_3)_2 centre dot(NH_3CH_2CH_2NH_2)_3 centre dot [NaCr_2Mo_(12)O_(30)(PO_4)(HPO_4)_4(H_2PO_4)_3] centre dot 6H_20

摘要

A chromic molybdenum phosphate,(NH_3CH_2CH_2NH_3)_2 centre dot(NH_3CH_2CH_2NH_2)_3 centre dot [NaCr_2Mo_(12)O_(30)(PO_4)(HPO_4)_4(H_2PO_4)_3] centre dot 6H_20, involving molybdenum present in V oxidation, has been hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction and IR spectrum. Deep brown-red crystals are formed in the triclinic system,space group P1, a=12.067(2), b=14.677(3), c=21l.290(2) A,#alpha#=80.940(10)deg, #beta#=82.960(10)deg,#gamma#=76.61(2)deg. The structure of the title compound may be considered to be two [Mo_6O_(15)(HPO_4)(H_2PO_4)3]~(5-) units bonded to a chromic atom, although several P-O groups are not protonated on account of coordination with a Na~+ cation. The one-dimensional tunnels were formed in the solid of the title compound.