title: Nickel(II) complexes of heterodichalcogenido and monochalcogenido imidodiphosphinate ligands: AACVD synthesis of nickel ditelluride.
abstract: The reaction of two equivalents of (TMEDA)Li[(EP(i)Pr(2))(TeP(i)Pr(2))N] (E = S, Se) with NiBr(2)(DME) in THF at 23 degrees C yields homoleptic complexes of heterodichalcogenido PNP ligands Ni[(EP(i)Pr(2))(TeP(i)Pr(2))N](2) (2, E = S; 3, E = Se). Similarly, the complexes Ni[(P(i)Pr(2))(EP(i)Pr(2))N](2) (4, E = Se; 5, E = Te) are obtained by in situ deprotonation of the neutral monochalcogenides E=P(i)Pr(2)NP(H)(i)Pr(2) (E = Se, Te) with (n)BuLi in THF at -78 degrees C followed by addition of NiBr(2)(DME). The complexes 2-5 have been characterised by multinuclear ((1)H, (31)P, (77)Se and (125)Te) NMR spectroscopy in solution and by X-ray crystallography in the solid state, the results of which show that they all exist as the square planar, trans isomers. Aerosol-assisted chemical vapour deposition (AACVD) of Ni[(SeP(i)Pr(2))(TeP(i)Pr(2))N](2) yields crystalline Ni(0.51)Te films at 450-500 degrees C, which were analysed by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS).
authors.affiliation: Department of Chemistry, University of Calgary, Calgary, AB, Canada.
authors.forename: Stuart D
authors.initials: SD
authors.lastname: Robertson
authors.forename: Tristram
authors.initials: T
authors.lastname: Chivers
authors.forename: Javeed
authors.initials: J
authors.lastname: Akhtar
authors.forename: Mohammad
authors.initials: M
authors.lastname: Afzaal
authors.forename: Paul
authors.initials: P
authors.lastname: O'Brien
mesh_terms: D000336:Aerosols; D018360:Crystallography, X-Ray; D007094:Imides / Q000737:chemistry*; D008024:Ligands; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010721:Phosphinic Acids / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*; D014835:Volatilization
chemical_list: D000336:Aerosols; D007094:Imides; D008024:Ligands; D009942:Organometallic Compounds; D010721:Phosphinic Acids; D009532:Nickel; D013691:Tellurium