13648-79-8Relevant articles and documents
Bis(pentafluorophenyl)phosphinous acid in the synthesis of P,P-bis(pentafluorophenyl)phosphorylalkanones and -alkanediones
Goryunov,Goryunova,Nelyubina, Yu. V.,Frolova,Savin,Strelkova,Pasechnik,Brel
, p. 2317 - 2324 (2014)
Addition of bis(pentafluorophenyl)phosphinous acid to α,β-alkenones and α,β,β'-alkene-diones in anhydrous Et2O (the solvent, in which the P-OH tautomeric form predominates) proceeds rapidly and regiospecifically at the C=C bond of the substrate
Fully fluorinated imidodiphosphinate shells for visible- and NIR-emitting lanthanides: Hitherto unexpected effects of sensitizer fluorination on lanthanide emission properties
Glover, Peter B.,Bassett, Andrew P.,Nockemann, Peter,Kariuki, Benson M.,Van Deun, Rik,Pikramenou, Zoe
, p. 6308 - 6320 (2008/02/13)
In this paper we demonstrate that the effect of aromatic C - F substitution in ligands does not always abide by conventional wisdom for ligand design to enhance sensitisation for visible lanthanide emission, in contrast with NIR emission for which the same effect coupled with shell formation leads to unprecedented long luminescence lifetimes. We have chosen an imidodiphosphinate ligand, N-{P,P-di-(pentafluorophinoyl)}-P,P-dipentafluoro-phenylphosphinimidic acid (HF20tpip), to form ideal fluorinated shells about all visible- and NIR-emitting lanthanides. The shell, formed by three ligands. comprises twelve fully fluorinated aryl sensitiser groups, yet no-high energy X - H vibrations that quench lanthanide emission. The synthesis, full characterisation including X-ray and NMR analysis as well as the photo-physical properties of the emissive complexes [Ln(F20tpip)3], in which Ln = Nd, Sm, Eu, Gd, Tb, Dy, Er, Yb, Y, Gd, are reported. The photophysical results contrast previous studies, in which fluorination of alkyl chains tends to lead to more emissive lanthanide complexes for both visible and NIR emission. Analysis of the fluorescence properties of the HF20tpip and [Gd-(F20tpip)3] reveals that there is a low-lying state at around 715 nm that is responsible for partially quenching of the signal of the visible emitting lanthanides and we attribute it to a π - σ* state. However, all visible emitting lanthanides have long lifetimes and unexpectedly the [Dy(F20tpip)3] complex shows a lifetime of 0.3 ms, indicating that the elimination of high-energy vibrations from the ligand framework is particularly favourable for Dy. The NIR emitting lanthanides show strong emission signals in powder and solution with unprecedented lifetimes. The luminescence lifetimes of [Nd(F20tpip)3], [Er(F20tpip)3] and [Yb(F20tpip)3] in deuteurated acetonitrile are 44, 741 and 1111 μs. The highest value observed for the [Yb(F20tpip)3] complex is more than half the value of the Yb ion radiative lifetime.
Some Novel Phosphoranides containing Pentafluorophenyl Groups
Ali, Rusmidah,Dillon, Keith B.
, p. 2593 - 2596 (2007/10/02)
Several novel phosphoranides containing pentafluorophenyl groups, of formulae - (X= Cl, Y= Cl, Br, or I; X= Br, Y= Br or I; X= NCS, Y= Cl, Br, I or NCS) or - (X= Cl, Y= Cl, Br, or I; X= Br, Y= Br or I; X= CN, Y= Cl, Br, I, or NCS) have been identified in solution by means of 31P n.m.r. spectroscopy.Most of the species have been isolated as salts with tetra-alkylammonium ions, and further characterised by elemental analysis and (in some cases) i.r. spectroscopy.These ions -> represent the first simple phosphoranides with an organo-group attached to phosphorus and no cyano-groups present.The species with two pentafluorophenyl groups are the first phosphoranides with two organo-groups directly bound to phosphorus.No acceptor properties towards halide ions were shown by P(CCl3)Cl2 or P(C6F5)2(NCS).
