| http://www.w3.org/ns/prov#value | - (i) MR1 xR2 yAz where M is an element selected from the group consisting of Li, Na, K, Rb, Cs, Fr, Be, Mg, Ti, Zr, Hf, Sc, Y, La, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, B, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, P, Sb and Bi, preferably B, Al, Ga, In, As, Sb, Si, Ge, Ti, Zr, or Hf; R1 is an alkoxy or siloxy; R2 is a ligand selected from the group cons
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