84975-93-9Relevant academic research and scientific papers
ALKYL- UND ARYL-KOMPLEXE DES IRIDIUMS UND RHODIUMS. X. CHELATPHOSPHIN-STABILISIERTE RHODIUMORGANYLE Rh(R)(PhP(CH2CH2CH2PPh2)2): SYNTHESE, NMR-SREKTROSKOPISCHER cis,trans-EINFLUSS UND MOLEKUELSTRUKTUR VON Rh(2-MeC6H4)
Arpac, E.,Dahlenburg, L.
, p. 27 - 36 (2007/10/02)
The organorhodium(I) complexes Rh(R) (R = CH2CMe3, CH2SiMe3; 2-MeC6H4, 4-MeC6H4, 2,4-Me2C6H3, 2,4,6-Me3C6H2; C2Ph) have been prepared and characterized by 31P and 1H NMR spectroscopy and an X-ray structure determination of the tolyl derivative Rh(2-MeC6H4).For these compounds, the relative 31P coordination shifts Δ(PPh2) > Δ(PPh) distinctly reflect the electron-releasing properties of the organoligands ?-bonded trans to PPh.As expected, coupling between the 103Rh nucleus and the phenylphosphino P atoms is weak and varies only little as the strong trans influence groups R are changed.In contrast to this insensitivity of 1J(Rh-PPh) to R, Rh-P coupling within the Ph2P-Rh-PPh2 moieties shows considerable dependence upon the nature of the C-donor producing the cis influence series sp3-C 2-C * C7H8.Crystals are orthorhombic, space group Pbc21, with a 1017.9(7), b 1974.3(14), c 2177.6(11) pm, and Z = 4.The structure has been refined to R = 0.079 for 2249 unique data with F0 > 3?(F0).Metal-phosphorus distances are 225.7(5) and 229.6(6) pm for Rh-PPh2 and 227.3(6) pm for Rh-PPh.
