High‐temperature infrared and Raman spectra of aluminium chloride dimer and monomer in the vapour phase

Abstract

The infrared spectra of aluminium chloride vapour (AI2CI6 and AIC13) including Aii5C16 and Ali7Clti at 473-843 K were measured in the region 700-50 cm-' with an evacuable Fourier transform spectrometer by transmission and emission techniques. Evacuable cells of nickel were employed having windows of type IIa diamond and sealed with gold O-rings. Raman spectra of AI,C16 vapour at cu 500 K and of AIC13 at 1075 K with pressures from 0.3 to 10 atm were recorded, polarization measurements were carried out and additional spectra of the 35CI and 37CI compounds were obtained. The dimer spectra were interpreted in terms of DZh symmetry. All the nine Raman-active and seven of the infrared-active dimer fundamentals were assigned. The IR active mode ulo(B1.), expected below 40 cm-', and the inactive mode u,(A.) were left unassigned. The monomer spectra were interpreted in terms of D f h symmetry and all four fundamentals were assigned. A dimer force field, involving 12 independent force constants, was derived. The calculated frequencies were fitted with a least-squares programme to 30 observed fundamentals of AI:'C1, and AlFCl6 and 14 additional isotopic shifts transferred from previous matrix isolation spectra. A complete force field for the monomer was derived, using the four observed fundamentals and seven isotopic shifts transferred from previously reported matrix isolation spectra.

Corrosion mechanism and kinetics of Al-Zn coating deposited by arc thermal spraying process in saline solution at prolong exposure periods

“…13). The Raman peaks at 226, 260, 400, and 725 cm −1 reveal the presence of Simonkolleite 59,73,74 while 322 cm −1 corresponds to AlCl 3 phase 75 and 810 and 951 cm −1 correspond to the Al(OH) 3 phase 76 . Although, AlCl 3 and Al(OH) 3 was not detected in XRD pattern, and it is potentially due to the extremely thin layer and low amounts.…”

Dinuclear complex formation in TaCl5–AlCl3 molten mixtures: Vibrational modes and thermodynamics

“…1. The pure components in their liquid state occur both in molecular dimeric form (Ta 2 Cl 10 (l) and Al 2 Cl 6 (l)) and their Raman spectra are well known [9,19,20]. From a structural point of view, both molecules have a D 2h configuration (i.e.…”

Quantum Mechanical Studies of Bond and Molecular Polarizabilities of Gas-Phase Metal Halides

“…Both types of dimers have eight residual atomic polarizability degrees of freedom. According to spectroscopic studies [43,44] the dimers of the group 13 trihalides belong to D2h point group, this implies a planar four-membered ring. The ground state electronic configuration for the trihalide dimer satisfies the Linnett model [27].…”