High temperature infrared vapour spectra, molecular orbital calculations and vibrational analysis of AlCl3,NH3 and AlCl3ND3

✍ Scribed by Carl E Sjøgren; E Rytter

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 740 KB
• Volume: 41
• Category: Article
• ISSN: 1386-1425
• DOI: 10.1016/0584-8539(85)80235-x

✦ Synopsis

The i.r. spectra of AlCIaNH3, trichloroammine aluminium, and AlCI,ND,, trichloroammine(D) aluminium, vapours were recorded in the 50-1800 and 23W3500 cm-' regions with an evacuable Fourier transform spectrometer by transmission and emission techniques. Evacuable cells of nickel, having windows of type Ha diamond and sealed with O-rings of gold, were employed.

All i.r. active fundamentals were assigned and a valence force field based upon the present i.r. frequencies was derived. An indirect observation of the inactive torsional mode rules out the possibility of free internal rotation around the AI-N bond and this conclusion was supported by an ab initio calculation.

The spectra were interpreted in terms of a staggered Csv structure and analysis of i.r. band contours and Raman oolarization measurements reoorted in the literature were used as an aid to the assignment of fundamentals.