The Crystal Structure of Titanium Phosphide Ti5P3

✍ Scribed by Prof. Dr. G. Brauer; Dr. K. Gingerich; Dipl.-Chem. M. Knausenberger

• Publisher: John Wiley and Sons
• Year: 1964
• Tongue: English
• Weight: 129 KB
• Volume: 3
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.196402312

✦ Synopsis

estimated from the molecular volumes and data derived from a large amount of experimental material 121. In contrast, the considerably shorter relaxation time for triphenylamine can only be explained by internal mobility. Evidently inversion takes place, facilitated by the arrangement of the N-Ph bonds in a pyramid that is flatter than those of the other two molecules. The low dipole moment of triphenylamine also implies very close approximation to a flat structure, with valence angles greater than the tetrahedral angle. These determinations assure that any inversion in triphenylarsine and triphenylphosphine should be at least 100 times less probable than in the amine. Moreover, the values for tribenzylamine show that inversion evidently occurs only when the nitrogen is linked to an aromatic ring [*I.

The relaxation times were determined by microwave absorption. For this purpose, dilute soldtions (about 1 mole-%) in benzene were examined at 20°C at frequencies varying between 500 Mc (A = 60 cm) and 115 Gc (A = 2.6 mni).