Showing papers by "Jacques E. Guerchais published in 1974"
TL;DR: In this article, the infrared spectra of the three compounds {VO2F(AA) and {VOF3L2} showed two strong absorptions (in the 800-950 cm−1 region) which are likely to arise from vs and vas(VO2).
10 citations
TL;DR: The existence of several isomers of the ions (MoO 2 F 2 (AB)) could be explained by the influence of π-bonding as discussed by the authors, which can be found in about 15 new ions (MO n F m (AB) − (n = 0, 1, 2, n + m = 4, AB = bidentate ligand; M = Mo, W, Ti, V).
Abstract: The existence of several isomers of the ions (MoO 2 F 2 (AB)) could be envisaged. The fact that there is only one form can be explained by the influence of π-bonding. One finds this effect in about 15 new ions (MO n F m (AB)) − ( n = 0, 1, 2, n + m = 4, AB = bidentate ligand; M = Mo, W, Ti, V). The trans position has also been observed in monomeric or dimeric compounds ( e.g. , (Mo 2 O 4 F 4 (C 2 O 4 )) 2− ). Although previous workers have reported the reduction of molybdenum(VI) in HBr medium, by reducing the rate of the oxidation-reduction process, we have been able to observe the co-existence of Br − and Mo(VI) ions when preparing numerous compounds with a view to exchange. The natural preferential selection of structural forms is found through exchanging F, Cl, Br. X-ray crystallographic measurements allow one to observe the resemblance between the ligands O, F, Cl, OO, which makes it possible to broaden the idea of oxo-species as defined by Selbin and Mitchell. These analogies are not apparent from spectroscopic methods.
1 citations