Download Bonding and Charge Distribution in Polyoxometalates: A Bond by D. Michael P. Mingos PDF

By D. Michael P. Mingos

Content material: Bond length-bond valence relationships, with specific connection with polyoxometalate chemistry / K.H. Tytko -- A bond version for polyoxometalate ions composed of MO6 octahedra (MOk polyhedraa with okay > four) / K.H. Tytko -- Bonding and cost distribution in isopolyoxometalate ions and proper oxides -- a bond valence strategy / K.H. Tytko

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Additional resources for Bonding and Charge Distribution in Polyoxometalates: A Bond Valence Approach (Structure and Bonding, Volume 93)

Example text

915 A). 5% non-octahedra]. , Ref. 44. 9. . . u. as the standard deviation observed for MvI species, characterizing by the intersections with the az(B) graphs the magnitude of the deviations from the correct B values in the case of experimentally ascertained structural data (see text). The left-side branches of the graphs show in some instances a different sequence due to a more complicated course of the graphs at small B values (occurrence of a more or less strongly marked shoulder or even an additional minimum).

The standard deviations for the M-O bond valences and for the charge on the oxygen atoms at application of the exponential function, based on the set of reference structures, are given in Table 2. 5 TaV-O Bonds Since all available oxotantalate structures consisted only of MO6 octahedra, an independent determination of B (or N) was impossible. 921 ,~. 6 Comparison of the Bond Length-Bond Valence Functions Derived with Those of the Literoture The numerical values of the bond length-bond valence parameters are rather unsuitable for a comparison of the different functions.

U. This shows again that Eq. (la) gives a somewhat better description of the structural data than Eq. (lb). Introduction of a third adjustable parameter into Eqs. , according to Eqs. ( l l a ) and ( l l b ) , respectively, led for the case of Eq. H. Tytko et al. to no further improvement of az and for the case of Eq. , the value which was also obtained with Eqs. (la) and (11a). u. 2%) is merely due to bond length errors (compare Sects. 2). The standard deviations for the M-O bond valences and for the charge on the oxygen atoms at application of the exponential function, based on the set of reference structures, are given in Table 2.

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