ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 0044-2313
    Keywords: Phosphoraneiminato Complexes ; Boron Compounds ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphaneimine and Phosphoraneiminato Complexes of Boron. Synthesis and Crystal Structures of [BF3(Me3SiNPEt3)], [BCl2(NPPh3)]2, [BCl2(NPEt3)]2, [B2Cl3(NPEt3)2]+BCl4-, and [B2Cl2(NPiPr3)3]+BCl4-The title compounds have been prepared from the corresponding silylated phosphaneimines and boron trifluoride etherate and boron trichloride, respectively. The compounds form white moisture sensitive crystals, which were characterized by 11B-nmr-spectroscopy, IR-spectroscopy and by crystal structure determinations.[BF3(Me3SiNPEt3)]: Space group P21/c, Z = 4, R = 0.032 for reflections with I 〉 2σ(I). Lattice dimensions at -70°C: a = 1361.0, b = 819.56, c = 1422.5 pm, β = 109.86°. The donor acceptor complex forms monomeric molecules with a B—N bond length of 157.8 pm.[BCl2(NPPh3)]2 · 2 CH2Cl2: Space group P21/c, Z = 2, R = 0.049 for reflections with I 〉 2σ(I). Lattice dimensions at -50°C: a = 1184.6, b = 2086.4, c = 843.0 pm, β = 96.86°. The compound forms centrosymmetric dimeric molecules in which the boron atoms are linked to B2N2 four-membered rings with B—N distances of 152.7 pm via μ2-N bridges of the NPPh3 groups.[BCl2(NPEt3)]2: Space group Pbca, Z = 4, R = 0.029 for reflections with I 〉 2σ(I). Lattice dimensions at -90°C: a = 1269.5, b = 1138.7, c = 1470.3 pm. The compound has a molecular structure corresponding to the phenyl compound with B—N ring distances of 151.0 pm.[B2Cl3(NPEt3)2]+BCl4-: Space group Pbca, Z = 8, R = 0.034 for reflections with I 〉 2σ(I). Lattice dimensions at -70°C: a = 1309.3, b = 1619.8, c = 2410.7 pm. Within the cations the boron atoms are linked to planar, asymmetrical B2N2 four-membered rings with B—N distances of 155.1 and 143.1 pm via the μ2-N atoms of the NPEt3 groups.[B2Cl2(NPiPr3)3]+BCl4- · CH2Cl2: Space group Pna2, Z = 4, R = 0.033 for reflections with I 〉 2σ(I). Lattice dimensions at -70°C: a = 1976.5, b = 860.2, c = 2612.7 pm. Within the cations the boron atoms are linked to planar, asymmetrical B2N2 four-membered rings with B—N distances of 153.7 and 150.5 pm via the μ2-N atoms of two of the NPiPr3 groups. The third NPiPr3 group is terminally connected to the sp2-hybridized boron atom with a B—N distance of 133.5 pm and with a B—N—P bond angle of 165.3°.
    Notes: Die Titelverbindungen werden aus den entsprechenden silylierten Phosphaniminen Me3SiNPR3 und Bortrifluorid-Etherat bzw. Bortrichlorid hergestellt. Die Verbindungen bilden weiße, feuchtigkeitsempfindliche Kristalle, die wir durch 11B-NMR- und IR-Spektren sowie durch Kristallstrukturanalysen charakterisiert haben.[BF3(Me3SiNPEt3)]: Raumgruppe P21/c, Z = 4, R = 0,032 für Reflexe mit I 〉 2σ(I). Gitterkonstanten bei -70°C: a = 1361,0; b = 819,56; c = 1422,5 pm, β = 109,86°. Der Donor-Akzeptor-Komplex bildet monomere Moleküle mit einer B—N-Bindungslänge von 157,8 pm.[BCl2(NPPh3)]2 · 2 CH2Cl2: Raumgruppe P21/c, Z = 2, R = 0,049 für Reflexe mit I 〉 2σ(I). Gitterkonstanten bei -50°C: a = 1184,6; b = 2086,4; c = 843,0 pm; β = 96,86°. Die Verbindung bildet zentrosymmetrische dimere Moleküle, in denen die Boratome über μ2-N-Brücken der NPPh3-Gruppen zu B2N2-Vierringen mit B—N-Abständen von 152,7 pm verknüpft sind.[BCl2(NPEt3)]2: Raumgruppe Pbca, Z = 4, R = 0,029 für Reflexe mit I 〉 2σ(I). Gitterkonstanten bei -90°C: a = 1269,5; b = 1138,7; c = 1470,3 pm. Die Verbindung hat einen zu der Phenylverbindung entsprechenden Aufbau mit B—N-Ringabständen von 151,0 pm.[B2Cl3(NPEt3)2]+BCl4-: Raumgruppe Pbca, Z = 8, R = 0,034 für Reflexe mit I 〉 2σ(I). Gitterkonstanten bei -70°C: a = 1309,3; b = 1619,8; c = 2410,7 pm. In den Kationen sind die Boratome über die μ2-N-Atome der NPEt3-Gruppen zu planaren, asymmetrischen B2N2-Vierringen mit B—N-Abständen von 155,1 und 143,1 pm verknüpft.[B2Cl2(NPiPr3)3]+BCl4- · CH2Cl2: Raumgruppe Pna21, Z = 4, R = 0,033 für Reflexe mit I 〉 2σ(I). Gitterkonstanten bei -70°C: a = 1976,5; b = 860,2; c = 2612,7 pm. In den Kationen sind die Boratome durch die μ2-N-Atome zweier NPiPr3-Gruppen zu planaren, asymmetrischen B2N2-Vierringen mit B—N-Abständen von 153,7 und 150,5 pm verknüpft. Die dritte NPiPr3-Gruppe ist mit dem sp2-hybridisierten Boratom terminal mit einem B—N-Abstand von 133,5 pm verbunden bei einem B—N—P-Bindungswinkel von 165,3°.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...