Aryldimethylelement cations of the heavier group 14 elements. An essentially three-coordinate plumbylium ion

Abstract

The kinetically stabilized group 14 cations [R_indEMe₂][B(C₆F₅)₄] (E = Si, Sn, Pb) were prepared and fully characterized (R_ind = dispiro[fluorene-9,3′-(1′,1′,7′,7′-tetramethyl-s-hydrindacen-4′-yl)-5′,9′′-fluorene). The deshielded heteronuclear NMR chemical shifts (δ(²⁹Si) = 160.4, δ(¹¹⁹Sn) = 619.9, δ(²⁰⁷Pb) = 1549.5) are indicative of the low coordination numbers.