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Divalent 4f element chemistry can now be expanded from Eu, Yb, and Sm to include Tm since a synthetic route to the first crystallographically characterizable molecular complex to TmII has been found. The intense green title complex was isolated from the reaction of TmI3 and Tm in dimethoxyethane. The photosensitive complex has the pentagonal-bipyramidal structure shown on the right.
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Bochkarev et al. (1997) studied this question.
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