At the limits of bisphosphonio‐substituted stannylenes

Bisphosphoniostannylenes and plumbylenes have been embedded into [3]ferrocenophane scaffolds staying monomeric for the stannylenes and dimerice via halide bridges for the plumbylene. The compounds are dynamic in solution which can be suspended with weakly coordination anions.

Abstract

Donor stabilization of Sn(II) and Pb(II) halides with 1,1’-ferrocenylene bridged bisphosphanes has been explored for Fe(C₅H₄P(C₆H₅)₂)₂ (dppf), and Fe(C₅H₄PH(C₄H₉))₂. These bisphosphanes are reacted with SnBr₂ and PbCl₂ with and without additional Lewis acid (AlCl₃) forming acyclic and cyclic donor adducts from which the latter represent bisphosphoniotetrylenes. Since dynamic exchange in solution is observed, characterization includes solution and solid-state NMR in addition to SC-XRD, amended by DFT calculations.

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