308084-79-9Relevant academic research and scientific papers
Strongly luminescent palladium(0) and platinum(0) diphosphine complexes
Tsubomura, Taro,Ito, Yasuhiro,Inoue, Satoshi,Tanaka, Yu,Matsumoto, Kenji,Tsukuda, Toshiaki
, p. 481 - 486 (2008/10/09)
The synthesis, structure, and photoluminescence of palladium(0) and platinum(0) complexes containing biarydiphosphines, biphep (biphep = 2,2′-bis(diphenylphosphino)-1,1′-biphenyl) and binap (binap = 2,2′-bis-(diphenylphosphino)-1,1′-binaphthyl) have been studied. X-ray structure analysis of [Pt(biphep)2] revealed the distorted-tetrahedral geometry of the complex. The photophysical properties of the three complexes [Pd(biphep)2], [Pt(biphep)2], and [Pd(binap)2] were investigated and compared with that of the previously reported [Pt(binap)2] complex. The [Pd(biphep) 2] complex shows the strongest luminescence with a high quantum yield (38%) and a long lifetime (3.2 μs) in a toluene solution at room temperature. The luminescence should be due to metal-to-ligand charge transfer excited states. At room temperature, radiative rate constants of the four complexes show similar values. The difference in the luminescent properties should reflect the different nonradiative rate constants of the complexes. The temperature-dependence of the luminescence spectra and lifetime of the complexes were also discussed.
Enantiodiscrimination and enantiocontrol of neutral and cationic Pt II complexes bearing the Tropos biphep ligand: Application to asymmetric lewis acid catalysis
Mikami, Koichi,Kakuno, Hitomi,Aikawa, Kohsuke
, p. 7257 - 7260 (2007/10/03)
(Chemical Equation Presented) The stereochemically stable, enantiopure biphep-Pt complexes can be employed as an atropos asymmetric catalyst at 50°C or below. Both enantiomeric forms of this complex can be obtained by using either the chiral diamine (R)-dabn or its diamide (R)-dabnTf followed by chirally controlled formation of the single biphep-Pt enantiomer at higher (> 60°C) temperatures (see scheme; Tf=trifluoromethanesulfonate).
