Syntheses, structures and properties of two molybdenum phosphates [(H20P8Mo12V CdO62) (C4H14N3)(2)] center dot 2C(4)H(13)N(3) center dot 8H(2)O and [(H2P2Mo5VI O-23) (C4H14N3) (C4H15N3) (H3O)] center dot 3H(2)O

摘要

Two new molybdenum phosphates [(H20P8Mo12CdO62) (C4H14N3)(2)] center dot 2C(4)H(13)N(3) center dot 8H(2)O (1) and [(H2P2Mo5O23) (C4H14N3) (C4H15N3) (H3O)] center dot 3H(2)O (2) have been synthesized under the hydrothermal conditions and structurally characterized by single crystal X-ray diffractions. The compound I crystallizes in the monoclinic, space group P2(1), a = 13.2728(6) angstrom, b = 22.1483(9) angstrom, c = 13.6274(7) angstrom, beta = 103.491(2)degrees, Z = 2. The crystal structure of 1 contains the isolated [H20Mo12P8O62](2-) units around which the protonated diethylenetriamine ions, the non-protonated diethylenetriamines and lattice water are positioned, While the compound 2 crystallizes in the triclinic, space group P-1, a = 10.3069(7) angstrom, b = 10.9483(8) angstrom, c = 15.6859(14) angstrom, alpha = 95.768(3)degrees, beta = 95.678(4)degrees, gamma = 111.391(3)degrees, Z = 2.The crystal structure of 2 also contains the isolated polyanion units [H2P2Mo5O23](4-) around the protonated diethylenetriamine ions, lattice water and the protonated water molecules. By hydrogen bond interactions their polyanions of the compounds 1 and 2 are both interconnected to form pseudo three-dimensional molybdophosphate. Other characterizations by elemental analyses, IR spectra and fluorescent spectra are also described. The electrochemical behaviors of 1 and 2 have also been studied in detail by cyclic voltammograms. (c) 2006 Elsevier B.V. All rights reserved.