Transition Metal Complexes of Organoaluminum Phosphides. The Synthesis, Characterization and Crystal and Molecular Structure of Cr(CO)5(PPh2Al(CH2SiMe3)2.NMe3).

摘要

The reactions of organoaluminum phosphides with a variety of transition metal carbonyl complexes containing labile ligands have been investigated. The reaction of Cr(CO)5NMe3 with (Me3SiCH2)(2AlPh2) in benzene solution leads to the formation of Cr(CO)5(PPh2Al(CH2SiMe3)2. NMe3), a fully characterized new compound. An x-ray structural study has identified discrete isolated molecules. Diffraction data were collected with a Syntex P2 sub 1 diffractometer and the structure was refined to R sub F = 6.4% for all 4948 reflections. There are no abnormally short intermolecular contacts. The unusual features identified in the investigation are the long bond distances for Al-P of 2.485(1)A and Cr-P of 2.482(1)A. The Al-N bond seems to be normal. The geometry about the tetrahedrally coordinated phosphorus atom is decidely irregular. Similarily, the aluminum atom has a rather distorted tetrahedral environment.