| 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, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Cu, Ag, Au, Zn, Cd, Hg, B, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb and Bi, preferably B, Al, Ga, In, As, Sb, Si, Ge, Sn, Pb, Zn, Cd and Hg; R1 is a hydride; R2 is a ligand selected from the group consisting of hydride, alkyl
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