Examination of a number of new phosphorus compounds has provided additional confirmation for many of the group frequencies reported previously. In certain cases additional information has been obtained on the effect of environment on the band positions, and some previously unassigned bands have been attributed to specific structures. In particular, bands previously assigned to P(S), P(S)X, C—H deformation, P—O—(C), P—C, P—S—H, P—S(P), P—N, C—S(P), and C—N(P) are discussed.
The assignments of several infrared bands of aliphatic phosphor~~s co~npounds have been reviewed and extended on the basis of new or improved data. These bands include POP, P -+ S, PSH, PSR, PH, and PCI. Several new assignments are proposed, mainly in the 12-24 p region. ' I' xvo esarnplcs are given of the applicatio~l of these assignments to the determination of the s t r u c t~~r e of the thiopyrophosphates. I t is shown that all procedures used for preparing monothiopyrophosphates yield exclusively the thiono isomer.
Confirmation of the existence of aluminum trilaurate has been obtained by using infrared absorption to follow the course of the reactions of trimethylaluminum and aluminum isopropoxide with lauric acid. The trisoap is shown to exist as micelles of high molecular weight in solution, the size decreasing on dilution or elevation of temperature. On hydrolysis to the disoap, hydrogen bonding does not appear to play a significant role in the formation of polymer structures. Coordination of carboxylate groups with aluminum is shown to be a major feature of the structure of both tri- and di-soaps. Spectral assignments in the 6.0 to 6.4 μ region have been made for various types of inter- and intra-molecular coordination. The effects of dilution, hydrolysis, and hydrochlorination of aluminum trilaurate in solution have been assessed by viscosity, light-scattering, and infrared measurements.
The application of near infrared spectra to thc study of phosphorus coinpoc~nds has been investigated. I t has been fo~111d that each type of radical gives a characteristic set of bands, which are not appreciably affected by changes in the molecule more than two atoms distant. Characteristic group frequencies are give11 for MeO, EtO, n-Pro, %-Pro, n-BuO, Me,
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