|
Z. Naturforsch. 2013,
68b, 1321 – 1326
doi:10.5560/ZNB.2013-3202
Synthesis of a Tri(gold)boride Complex (Cy3P)B[AuP(o-Tol)3]3
1 Department Chemie, Technische Universität München, Lichtenbergstraße 4, 85747 Garching b. M., Germany
2 Chemistry Department, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Reprint requests to Prof. Hubert Schmidbaur. E-mail:
H.Schmidbaur@lrz.tum.de or PD Dr. Florian Kraus. E-mail:
Florian.Kraus@tum.de
Received July 29, 2013 / published online November 22, 2013
A tri(gold)boride of the formula B[AuP(o-Tol)3]3 (2) is generated in the reaction of the silylated phosphine borane Cy3PBH2SiMe3 with the tri(gold)oxonium tetrafluoroborate [(o-Tol)3PAu]3O+ BF4− and isolated as its stable 1:1 complex with tricyclohexylphosphine: Cy3PB[AuP(o-Tol)3]3. The composition of the product has been confirmed by elemental analyses and mass spectrometry. Solution NMR data of 2 indicate a molecular structure with C3v symmetry which has been confirmed by MP2 calculations for the model system H3PB(AuPH3)3. The compound is a rare case of a trimetallated boride which is isolobal with the simple phosphineborane Cy3PBH3. With reagents bearing less bulky substituents (R3 = iPr3, MePh2, Ph3), the reactions proceed to salts with the tetra-aurated cations [Cy3PB(AuPR3)4]+.
Key words: Gold, Boride, Phosphine Borane, Boron Coordination