| http://www.w3.org/ns/prov#value | - M2 in Structures XI, XII, and XIII is a four-coordinate metal such as Ti, Zr, Hf, or Ge; R4 and R5 are defined as in Structures III and IV. Examples of R4 and R5 are methyl, ethyl, propyl, 1-methylethyl, butyl, 2-methylpropyl, 1,1-dimethylethyl, phenyl, styryl, cyclohexyl, methoxy, ethoxy, propoxy, 1-methylethoxy, butoxy, 2-methylpropoxy, 1,1-dimethylethoxy, substituted and unsubstituted phenoxy,
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