prov:value
| - M is ruthenium or osmium, Y is oxygen (O), sulphur (S), a radical N???R1 or a radical P???R1, where R1 is as defined below, X1 and X2 are identical or different, preferably anionic ligands, R1 is an alkyl, cycloalkyl, alkenyl, alkynyl, aryl, alkoxy, alkenyloxy, alkynyloxy, aryloxy, alkoxycarbonyl, alkylamino, alkylthio, arylthio, alkylsulphonyl or alkylsulphinyl radical, each of which may optional
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