prov:value
| - ble of bonding the two ligands E1 and E2 to each other, are independently a C1???C20 hydrocarbon group, a C1???C20 halogen-containing hydrocarbon group, a silicon-containing group, a germanium-containing group, a tin-containing group, ???O???, ???CO???, ???S???, ???SO2???, ???Se???, ???NR1???, ???PR1???, ???P(O)R1???, ???BR1??? or ???AlR1??? wherein R1 is a hydrogen atom, a halogen atom, a C1???C2
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