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 ok > four) / K.H. Tytko -- Bonding and cost distribution in isopolyoxometalate ions and appropriate oxides -- a bond valence procedure / K.H. Tytko
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Additional info for Bonding and Charge Distribution in Polyoxometalates: A Bond Valence Approach (Structure and Bonding, Volume 93)
Since it is absolutely necessary to correct the bond lengths for systematic errors by individual fitting of do (see Sect. 2), it is indispensable to use a common B for the different oxidation states of M. This requirement appears to be fulfilled at least for vIV'V-o compounds, see above and Refs. 15-17. 1 The Quality of the Structure Determinations of the (Poly)oxometalates In view of the difficulties with the derivation of the bond length-bond valence parameters B and do because of inaccurate bond lengths stated in the literature for the structures, we give in the following a relevant characterization of the published structural data.
Table 3. Test of the quality of bond length-bond valence functions from the literature by means of the standard deviation az for the sum of the bond valences about M for the sets of reference structures established in this article Authors Schr6der  Fuchs et al.  Allmann  Brown et al. u. ; w V I - o : S = - 2 . u. H. Tytko et al. 3 Errors with the Use of the "General" and of "Universal" Bond Length-Bond Valence Parameters The bond length-bond valence parameters do and B (or do and N), derived in Sects.
Ordinate: n u m b e r of oxomolybdate structures; abscissa: range of the average error square for the sum of the bond valences about the M atoms for the individual structures (euq). 8% range) if there is a normal distribution of the errors. ) 2 have additionally been rejected). 100 100 90 80 70 60 50 40 30 20 80 2 70 60 50 40 30 r 20 10 10 0 4 84 . . . . ) 2 Fig. 2b. Reliability (outliner) test of the structural data of 66 isopolyoxomolybdates and 21 monomolybdates, continued. The cumulative percentage of the structures with a certain average error square for the sum of the b o n d valences about the M atoms of the structures o is compared with that for the case of a normal distribution, based on ev ( ........