Journal ArticleDOI
Conformational effects on P–N–P coupling constants in diphosphinoamines and related compounds
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In this paper, it was shown that the conformations about the P-N bonds are influenced by the stereochemical bulk of R. The dependence on the R groups has been found for the diphosphinoamines, Ph2P·NR·PPhCl (R = Me, Et, Prn, Pri, and But).Abstract:
1 H-{31P} and 31P n.m.r. measurements on the triphosphazanes (Ph2P·NR)2PPh show that J(PNP) is +280 Hz when R = Me and 25.1 Hz when R = Et. A similar marked dependence on the R groups has been found for the diphosphinoamines, Ph2P·NR·PPhCl (R = Me, Et, Prn, Pri, and But)(+334 to –35 Hz), and this may be related to the conformations about the P–N bonds, which are influenced by the stereochemical bulk of R. 1H-{31P} INDOR experiments on the symmetrical diphosphinoamines, Ph2P·NR·PPh2(R = Me, Et, and Pri), indicatethat J(PNP) is much greater when R = Me than when R = Et or Pri.read more
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Journal ArticleDOI
Coordination chemistry of diphosphinoamine and cyclodiphosphazane ligands
Maravanji S. Balakrishna,V. Sreenivasa Reddy,Setharampattu S. Krishnamurthy,John F. Nixon,J.C.T.R.Burckett St. Laurent +4 more
TL;DR: The transition metal coordination and organometallic chemistry of acyclic diphosphazane ligands has grown rapidly in the last two decades and a stage has been reached that permits a delineation of similarities and contrasts with the chemistry of Diphosphinomethane type ligands.
Journal ArticleDOI
Bis(diphenylphosphino)amine and related chemistry
Journal ArticleDOI
Models of the iron-only hydrogenase: a comparison of chelate and bridge isomers of Fe2(CO)4{Ph2PN(R)PPh2}(μ-pdt) as proton-reduction catalysts
Shishir Ghosh,Graeme Hogarth,Nathan Hollingsworth,Katherine B. Holt,Idris Richards,Michael G. Richmond,Ben E. Sanchez,David G. Unwin +7 more
TL;DR: Electrochemical and electrocatalysis studies have shown that the faster rate of catalysis of the chelating complex can be traced to its greater propensity for protonation, supporting the theory that asymmetric distribution of electron density along the iron-iron bond leads to faster catalysis for models of the Fe-Fe hydrogenase active site.
Journal ArticleDOI
New tetraphosphane ligands {(X2P)2NC6H4N(PX2)2} (X = Cl, F,OMe, OC6H4OMe-o): synthesis, derivatization, group 10 and 11 metal complexes and catalytic investigations. DFT calculations on intermolecular P...P interactions in halo-phosphines.
TL;DR: The reaction of p-phenylenediamine with excess PCl 3 in the presence of pyridine affords p-C 6H 4[N(PCl 2) 2] 2 in good yield, which is confirmed by single-crystal X-ray diffraction studies.
Journal ArticleDOI
Coordination chemistry of new selective ethylene trimerisation ligand Ph2PN(iPr)P(Ph)NH(R) (R = iPr, Et) and tests in catalysis
Bhaskar R. Aluri,Normen Peulecke,Stephan Peitz,Anke Spannenberg,Bernd H. Müller,Stefan Schulz,Hans-Joachim Drexler,Detlef Heller,Mohammed H. Al-Hazmi,Fuad Mosa,Anina Wöhl,Wolfgang Müller,Uwe Rosenthal +12 more
TL;DR: The synthesis of [Ph(2)PN((i)Pr)P(Ph)NH(R)] is described and the structure of 2 has been determined by single-crystal X-ray analysis and the central nitrogen atom adopts an almost planar (sp(2)) geometry.