The very strong solid Lewis acids aluminium chlorofluoride (ACF) and bromofluoride (ABF)—Synthesis, structure, and Lewis acidity

Investigation of fluorinated surfaces by means of radio-labelled probe molecules

“…The isomerisation was 'catalysed' by solid aluminium(III) chloride. In reality, however, as was pointed out many years ago [49] and confirmed more recently [25,50], isomerisation is accompanied by chlorination and solid AlCl 3 is better viewed as the catalyst precursor with the real catalyst being ACF.…”

“…This records the effect of repeated exposures of H 36 Cl aliquots to the solid strong Lewis acid, aluminium chlorofluoride, AlCl x F 3Àx , where x = 0.05-0.3 [23][24][25].…”

A comparative study of surface acidity in the amorphous, high surface area solids, aluminium fluoride, magnesium fluoride and magnesium fluoride containing iron(III) or aluminium(III) fluorides

“…Using a multi-technique approach, including FTIR measurements of adsorbed pyridine, temperature programmed desorption (TPD) of NH 3 and catalytic behaviour in probe reactions, notably its catalytic activity in C 1 halofluorocarbon dismutation reactions and isomerisation of CBrF 2 CBrFCF 3 , it has been established that HS-AlF 3 is one of the most effective solid Lewis acids presently known [10][11][12][13]. It is comparable in its behaviour to that of solid aluminium chlorofluoride, AlCl x F 3 À x , x = 0.05-0.25 [21,22]. This conclusion is supported by the [ 36 Cl]-tracer studies described here, as the behaviour of AlCl x F 3 À x towards [ 36 Cl]-Bu t Cl [15] is very similar to that described above for HS-AlF 3 .…”

Crystalline aluminium hydroxy fluorides—Suitable reference compounds for 19F chemical shift trend analysis of related amorphous solids

“…(ii) A post fluorination process with halofluoroalkanes (e.g. CHClF 2 ) gives HS-AlF 3 , exhibiting an extremely high Lewis acidity, comparable to SbF 5 or the solid Lewis acids ACF or ABF [20]. The final HS-AlF 3 and the intermediate xerogel are both X-ray amorphous and comparative vibrational analysis studies of AlF 3 -phases were made in order to understand structural features of the final HS-AlF 3 [21].…”