| http://www.w3.org/ns/prov#value | - or different, is hydrogen, halogen, a silicon-containing group, a C1-20 hydrocarbon group which may have a halogen substituent, an alkoxy group or an aryloxy group, m is 0 or 1, each n is an integer satisfying m+n=5, M is a metal of Group 4, 5 or 6 of the long-form Periodic Table, R4 is a neutral ligand coordinated to M, and R5- is a counter anion capable of stabilizing said metal. 11.
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