Synthesis and Characterization of a New Binucleating Tetraphosphine Ligand Based on 1,2-Phenylene Chelates and the Structures of Dinickel Tetrachloride Complexes of the Ligand
摘要:
A new binucleating tetraphosphine ligand, rac- and meso-(Et2P-1,2-C6H4)P(Ph)CH2(Ph)P(1,2-C6H4PEt2) (et,ph-P4-Ph), has been synthesized. Separation and purification of the ligand diastereomers have been accomplished via column chromatography. Ni2Cl4(et,ph-P4-Ph) complexes of both diastereomers have been prepared in high yield and crystallographically characterized.
Improved synthesis of a trisphosphine ligand and crystallographic characterization of the ligand and nickel thiocyanate complex
作者:William J. Schreiter、Alexandre R. Monteil、Marc A. Peterson、Gregory T. McCandless、Frank R. Fronczek、George G. Stanley
DOI:10.1016/j.poly.2012.11.028
日期:2013.7
Improved syntheses of o-C6H4(PEt2)(X) (X = F, Br, I) and the trisphosphine PhP[o-C6H4(PEt2)](2) have been developed and are applicable to a wide variety of phosphine substituents. The trisphosphine, PhP(o-Ph-PEt2)(2), has been fully characterized spectroscopically and, for the first time, crystallographically. Reaction of the P3 ligand with one equivalent of NiCl2 or Ni(BF4)(2) followed by 2.5 equivalents of KNCS produces the monometallic complexes Ni(X)(2)[kappa(3)-PhP(o-Ph-PEt2)(2)], (X = Cl or NCS). The nickel thiocyanate complex has been characterized via a crystal structure. The nickel center has a square pyramidal structure with one of the NCS ligands occupying the apical coordination site. The Ni complex crystallizes in the P (1) over bar space group with an unusual six molecules in the asymmetric unit (Z' = 6), and twelve in the unit cell. (C) 2012 Elsevier Ltd. All rights reserved.