Alkaline and Alkaline Earth Metal‐14 Compounds: Preparation, Spectroscopy, Structure and Reactivity

Abstract

Introduction Preparations Spectroscopic and Structural Studies Reactivities

Monoanionic Tin Oligomers Featuring Sn–Sn or Sn–Pb Bonds: Synthesis and Characterization of a Tris(Triheteroarylstannyl)Stannate and -Plumbate

“…The 207 Pb NMR spectrum of 3 is characterized by one signal at´1643 ppm and a 1 J( 207 Pb-119/117 Sn) coupling of 14900 Hz, which is smaller than observed for the hitherto isolated stannylplumbylenes (19971-22560 Hz) [26], but larger than determined for stannylplumbanes, e.g., Ph 3 SnPbPh 3 (3469 Hz) [33,34]. The chemical shift value of the three-coordinate lead atom in 3, however, is strikingly deviating from low field 207 Pb resonances usually observed for triaryl plumbates, e.g., at +1063 ppm for LiPbPh 3 [35] or +1020 ppm for the related [LiPb(2-py 6OtBu ) 3 ] [36]. Thus, in 3, the central lead atom is significantly more shielded according to a smaller contribution to the paramagnetic contribution term.…”