Donor-substituted phosphanes – surprisingly weak Lewis donors for phosphenium cation stabilisation
نویسندگان
چکیده
منابع مشابه
Donor-substituted phosphanes - surprisingly weak Lewis donors for phosphenium cation stabilisation.
Paradoxically, N- and O-donor substituted tri-arylphosphanes are shown to be weaker donors than PPh3 when binding the soft Lewis acid moiety [PPh2]+. This arises from internal solvation and rehybridisation at phosphorus, precluding chelation and increasing steric demand, in direct contrast to coordination modes observed for metal complexes.
متن کاملHow Lewis acidic is your cation? Putting phosphenium ions on the fluoride ion affinity scale.
The fluoride ion affinities (FIAs) of 33 phosphenium ions with a range of substituents were calculated using ab inito and DFT methods. The use of these FIA data as a measure of the Lewis acidities of phosphenium ions is described and the FIAs of the species studied here are compared to FIA data for more commonly encountered Lewis acids. Phosphenium ions are often stronger Lewis acids than neutr...
متن کاملSurprisingly Weak Magnetism on Young Accreting Brown Dwarfs
We have measured the surface magnetic flux on four accreting young brown dwarfs and one non-accreting young very low-mass star utilizing high resolution spectra of absorption lines of the FeH molecule. A magnetic field of 1-2 kG had been proposed for one of the brown dwarfs, 2MASS J1207334−393254, because of its similarities to higher mass T Tauri stars as manifested in accretion and the presen...
متن کاملA new approach to internal Lewis pairs featuring a phosphenium acid and a pyridine base.
A bis(imino)acenaphthene (BIAN) ligand containing a pendant Lewis base has been used as a new framework to support a N-heterocyclic phosphenium cation (NHP). Reactivity studies demonstrate the ability of the ligand to act as a Lewis base, while the phosphorus centre provides a Lewis acidic site, giving new opportunities in NHP chemistry.
متن کاملCation affinity numbers of Lewis bases
Using selected theoretical methods the affinity of a large range of Lewis bases towards model cations has been quantified. The range of model cations includes the methyl cation as the smallest carbon-centered electrophile, the benzhydryl and trityl cations as models for electrophilic substrates encountered in Lewis base-catalyzed synthetic procedures, and the acetyl cation as a substrate model ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Dalton Transactions
سال: 2016
ISSN: 1477-9226,1477-9234
DOI: 10.1039/c6dt03478k