Coordination geometry of lead carboxylates – spectroscopic and crystallographic evidence

摘要: Despite their versatility, only a few single-crystal X-ray structures of lead carboxylates exist, due to difficulties with solubility. In particular, the long-chain metal have not been reported. The lone electron pair in Pb(II) can be stereochemically active or inactive, leading two types coordination geometries commonly referred as hemidirected and holodirected structures, respectively. We report 13C 207Pb solid-state NMR infrared spectra for series carboxylates, ranging from hexanoate (C6) hexadecanoate (C18). based on consistent parameters divided groups, shorter-chain (C6, C7, C8) longer-chain (C9, C10, C11, C12, C14, C16, C18) carboxylates. This dichotomy suggests modes packing these solids, one short-chain consistency parameters, well IR data, each group that motif represents structure characteristic subgroup. also diffraction nonanoate (C9), first reported Taken together evidence geometry C6–C8 is hemidirected, C9–C14, C16 C18 holodirected.