Synthesis and crystal structure of bis(triethylphosphine)[hexakis-(trifluoromethyl)benzene]platinum, and of a nickelacycloheptatriene complex

Reaction of [Pt(PEt3)3] with hexakis(trifluoromethyl)benzene affords [Pt{C6(CF3)6}(PEt3)2], with a 1,2-hapto-structure; reaction of the nickel analogue with more hexafluorobut-2-yne gives a new kind of complex, a nickelahexakis(trifluoromethyl)cyclohepta-cis,trans,cis-triene; both structures have been established by X-ray crystal analysis.