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Reaction of europium metal with Hg(C 6 F 5 ) 2 in thf (thf = tetrahydrofuran) followed by crystallization from thf/light petroleum affords the organoeuropium(II) complex Eu(C 6 F 5 ) 2 (thf) 5 ( 1 ). The X-ray crystal structure reveals axial C 6 F 5 and equatorial thf ligands bound to a pentagonal-bipyramidal europium center.
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Forsyth et al. (2000) studied this question.
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