177216-48-7Relevant academic research and scientific papers
Quadruply Bonded Complexes Containing Bridging Acetate and μ3-Phosphine Ligands. Synthesis and Structural Characterization of the Molybdenum Complexes (1) and (2) (see abstract)
Lee, Chang-Tai,Chiang, Shih-Fu,Chen, Chun-Ting,Chen, Jhy-Der,Hslao, Chwan-Deng
, p. 2930 - 2936 (2008/10/09)
The complexes Mo2(OAc)Cl3(η3-tetraphos-2) (tetraphos-2 = P(CH2CH2PPh2)3, 1, and Mo2(OAc)Cl3(η3-etp)(etp = Ph2PCH2CH2P(Ph)CH2CH 2PPh2), 2, were prepared by reactions of Mo2(OAc)2Cl2(PPh3)2 with tetraphos-2 and etp, respectively, in CH2Cl2. Their UV - vis and 31P-NMR spectra have been recorded and their structures have been determined. Crystal data for 1: space group Pbca, a = 24.450 (2) A, b = 27.486 (3) A, c = 15.017 (3) A, V = 10091 (2) A3, and Z = 8, with final residuals R = 0.0683 and Rw = 0.0724. Both the tetraphos-2 and etp ligands coordinate to the Mo centers in tridentate fashions with chelating/bridging bonding modes. The complexes that are also bridged by the acetate ligands are twisted about the metal-metal bonds with average twist angles of 13.2° for 1 and 11.4° for 2, respectively. The lowest energy bands at 643 nm (14 389 cm-1, ε = 909 M-1 cm-1) for 1 and 644 nm (14388 cm-1, ε = 1536 M-1 cm-1) for 2 can be assigned to δ → δ transitions. The study on 31P{1H} NMR spectra of 1 and 2 concluded that the through metal-metal quadruple bonding coupling 1 3 JP-MO-MO-P1 is about 20 ±1 Hz.
