title: Synthesis, structures, and multinuclear NMR spectra of tin(II) and lead(II) complexes of tellurium-containing imidodiphosphinate ligands: preparation of two morphologies of phase-pure PbTe from a single-source precursor.
abstract: Group 14 metal complexes of heavy chalcogen-centered anions, M[(TeP(i)Pr(2))(2)N](2) (5, M = Sn; 6, M = Pb) and M(TeP(i)Pr(2)NP(i)Pr(2)Se)(2) (7, M = Sn; 8, M = Pb), were synthesized in 64-89% yields by metathesis of alkali-metal salts of the ligands with group 14 metal dihalides. Crystallographic characterization of the complexes revealed that 5, 6, and 8 engage in metal...chalcogen secondary bonds to generate dimers, whereas 7 is monomeric in the solid state. Multinuclear ((1)H, (31)P, (77)Se, and (125)Te) solution NMR data for these homoleptic complexes evinced dynamic behavior leading to the equivalence of the two ligand environments. The Pb(II) complex 6 was utilized as a single-source precursor to micrometer-scale lead telluride particles via two divergent techniques: aerosol-assisted chemical vapor deposition of the complex in THF/CH(2)Cl(2) solution onto glass substrates yielded rectangular prisms, while solution injection of 6 in tri-n-octylphosphine onto Si/SiO(2)(100) substrates heated to 200-220 degrees C resulted in the formation of wires. PXRD and EDX analysis of the products confirmed the phase purity of the PbTe materials.
authors.affiliation: Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada.
authors.forename: Jamie S
authors.initials: JS
authors.lastname: Ritch
authors.forename: Tristram
authors.initials: T
authors.lastname: Chivers
authors.forename: Kibriya
authors.initials: K
authors.lastname: Ahmad
authors.forename: Mohammad
authors.initials: M
authors.lastname: Afzaal
authors.forename: Paul
authors.initials: P
authors.lastname: O'Brien
mesh_terms: D007854:Lead / Q000737:chemistry*; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010316:Particle Size; D010721:Phosphinic Acids / Q000737:chemistry*; D013499:Surface Properties; D013691:Tellurium / Q000737:chemistry*; D014001:Tin / Q000737:chemistry*
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D010721:Phosphinic Acids; D007854:Lead; D014001:Tin; D013691:Tellurium