title: [The synthesis and spectral study of multicomponent heteropoly compounds with Keggin structure. II].
abstract: The multicomponent heteropoly compounds [Me4N]4 + x[SiVxMoyW12 - x - yO40].n H2O with Keggin structure have been synthesized and characterized by FTIR. The vibrational frequencies of containing-oxygen bonds (Si-Oa,M=Od, M-Ob-M and M-Oc-M) in these heteropoly compounds have been studied. The vibrational frequencies nu as(M=Od) and nu as(M-Ob-M) are demonstrated to explain why the acidity of the heteropoly compounds becomes weaker and the oxidative ability becomes stronger when W atoms are substituted by V atoms. The rule of the change is similar with [PVxMoyW12 - x - yO40](3 + x)-. In addition, the acidity of P series is stronger than the acidity of the corresponding Si series.
authors.affiliation: Institute of Structural Chemistry, Fuzhou University, Fuzhou 350002, China.
authors.forename: Zhi-hua
authors.initials: ZH
authors.lastname: Lin
authors.forename: Han-hui
authors.initials: HH
authors.lastname: Zhang
authors.forename: Chun-hua
authors.initials: CH
authors.lastname: Guo
authors.forename: Chang-cang
authors.initials: CC
authors.lastname: Huang
authors.forename: Rui-qing
authors.initials: RQ
authors.lastname: Sun
mesh_terms: D006863:Hydrogen-Ion Concentration; D008982:Molybdenum / Q000737:chemistry*; D009573:Nitrites / Q000737:chemistry; D010084:Oxidation-Reduction; D000071228:Polyelectrolytes; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry; D012825:Silicon / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013329:Structure-Activity Relationship; D014414:Tungsten / Q000737:chemistry; D017968:Vanadium Compounds / Q000737:chemistry*; D014732:Vibration
chemical_list: D008982:Molybdenum; D009573:Nitrites; D000071228:Polyelectrolytes; D011108:Polymers; D012825:Silicon; D014414:Tungsten; D017968:Vanadium Compounds; C037538:methyl nitrite