Affiliation:
1. Institut für Anorganische Chemie, Goethe-Universität Frankfurt am Main, 60438 Frankfurt am Main, Germany
Abstract
Abstract
Treatment of P4 with one equivalent of Li[SitBu3] leads to the formation of a number of oligo-phosphanes and -phosphides, e.g. the bicyclo[1.1.0]tetraphosphane P4(SitBu3)2, the heptaphosphanortricyclane P7(SitBu3)3, the tetraphosphides Li3[P(PSitBu3)3] (Li3
[2a]), and the pentaphosphacyclopentadienide Li[P5]. From this reaction we could isolate single crystals of Li3
[2a]. However, this reaction took another course in the presence of Li[OSitBu3]. When P4 was treated with one equivalent of Li[SitBu3] in the presence of Li[OSitBu3], the heptaphosphanortricyclanide Li[P7(SitBu3)2] (Li[8a]) was formed. Single crystals of the cluster {Li4(C6H6)(OSitBu3)[8a]
3}·C6H6 (orthorhombic, space group Pca21) were isolated from the reaction mixture at ambient temperature. This cluster compound consists of three chiral Li[P7(SitBu3)2] units, one silanolate Li[OSitBu3], and one benzene molecule. We further investigated the degradation reaction of the bicyclo[1.1.0]tetraphosphane P4(SitBu3)2. After heating a benzene solution to 60 °C for 24 h, we found 100 % conversion of P4(SitBu3)2, and P7(SitBu3)3 (monoclinic, space group P21/c) and tBu3SiPH2 were formed.
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