THE RELATIVE ACCEPTOR POWERS OF SILICON AND GERMANIUM TETRAHALIDES TOWARD PYRIDINE AND ISOQUINOLINE.
Abstract
Measurements were made, with a precision calorimeter, the heats of reaction at 25C of silicon and germanium tetrahalides with pyridine (py, as the neat liquid) and isoquinoline (iq, as a 1% solution in hexane), which forms insoluable 1:2 adducts. In all cases, except that of silicon tetrahalide-pyridine complexes, heats of formation decreased in the order F>Cl>Br. This suggests that the order of acceptor power is SiF4>SiCl4>SiBr4 toward isoquinoline, and GeF4>GeCl4>GeBr4 toward pyridine and isoquinoline, assuming that lattice energies are similar in a series of related complexes having the same structure. Heats of formation of silicon tetrahalide-pyridine complexes, therefore, do not permit a true evaluation of relative acceptor properties. In the absence of structural differences it is evident that heats of formation of germanium tetrahalide adducts are greater than those of the corresponding silicon complexes. This confirms that germanium tetrahalides are stronger electron-pair acceptors than their silicon analogues.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 23, 1964
- Accession Number
- AD0638051
Entities
People
- James M. L. Miller
- M. Onyszchuk
Organizations
- McGill University