title: Heptaphosphide cluster anions bearing group 14 element amide functionalities.
abstract: Reactions of the protonated heptaphosphide dianion, [HP7](2-), with one equivalent of E[N(SiMe3)2]2 (E = Ge, Sn, Pb) give rise to novel derivatized cluster anions [P7EN(SiMe3)2](2-) (E = Ge (1), Sn (2) and Pb (3)). All three species were characterized by multi-element solution-phase NMR spectroscopy and electrospray ionization mass spectrometry. In addition, 1 and 2 were structurally authenticated by means of single crystal X-ray diffraction in [K(18-crown-6)]2[P7EN(SiMe3)2]·2py. Interestingly, while 2 appears to be indefinitely stable in solution for prolonged periods of time, the germanium-containing analogue, 1, readily decomposes at room temperature giving rise to the dimeric species [(P7Ge)2N(SiMe3)2](3-) (4) and [K(18-crown-6)][N(SiMe3)2]. A low quality single crystal X-ray structure of the former allowed for the confirmation of its composition and connectivity which is consistent with the (31)P NMR spectrum obtained for the anion.
authors.affiliation: Department of Chemistry and University of Oxford and Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK. jose.goicoechea@chem.ox.ac.uk.
authors.forename: Gabriela Espinoza
authors.initials: GE
authors.lastname: Quintero
authors.forename: Isabelle
authors.initials: I
authors.lastname: Paterson-Taylor
authors.forename: Nicholas H
authors.initials: NH
authors.lastname: Rees
authors.forename: Jose M
authors.initials: JM
authors.lastname: Goicoechea
mesh_terms: D000577:Amides / Q000737:chemistry*; D000838:Anions; D043844:Crown Ethers / Q000737:chemistry; D005857:Germanium / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D017553:Phosphorus Compounds / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D014001:Tin / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D000577:Amides; D000838:Anions; D043844:Crown Ethers; D017553:Phosphorus Compounds; D005857:Germanium; D007854:Lead; D014001:Tin