| http://www.w3.org/ns/prov#value | - etal, preferably Ti, Zr or Hf, n is the valence state of the metal M, preferably 2, 3, 4, or 5, Q is an alkyl, halogen, benzyl, amide, carboxylate, carbamate, thiolate, hydride or alkoxide group, or a bond to an R group containing a heteroatom which may be any of R1 to R5 A heteroatom containing group may be any heteroatom or a heteroatom bound to carbon silica or another heteroatom.
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