Organolanthanoids XIX. The X-ray crystal structures of di [μ-(acetato-O,O:O′)bis(diphenylphosphino-η5-cyclopentadienyl)ytterbium(III)] and di[μ-(acetato-O,O:O′)bis(η5-cyclopentadienyl)ytterbium(III)] — unexpected examples of formal nine coordination in lanthanoid organometallics

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