prov:value
| - wherein: each L group is independently a neutral or anionic ligand; each Y group is independently a pi bonding ligand selected from the group of CO, NO, CN, CS, N2, PX3, PR3, P(OR)3, AsX3, AsR3, As(OR)3, SbX3, SbR3, Sb(OR)3, NHxR3-x, CNR, and RCN, wherein R is an organic group and X is a halide; y=1 to 4 (preferably, 1); z=0 to 4 (preferably, 1 to 4, more preferably, 2 or 3, and most preferably, 2
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