Bond Valence Sums in Coordination Chemistry Using Oxidation State Independent R0 Values. A Simple Method for Calculating the Oxidation State of Manganese in Complexes Containing Only Mn−O Bonds

An analysis of 250 MnOn fragments retrieved from the Cambridge Structural Database was used to derive the oxidation state independent R0 value of 1.754 Å for Mn−O bonds that can be used to reproduce the oxidation state using the bond valence sum (BVS) method. The coordination numbers varied from 3 to 8 and the oxidation states from 2 through 7. Deviations of the BVS from an integer value are discussed. An analysis of the 1360 Mn−O bond distances used suggests that the BVS is more significant in discussing Mn−O structures than a comparison of bond distances.