59802-61-8Relevant academic research and scientific papers
FLUOROCARBON-SELENIUM CHEMISTRY: ACCOMPLISHMENTS AND QUESTS
HAAS, A.
, p. 415 - 440 (2007/10/02)
The binary selenium fluorides SeFn (n = 2, 4, 6) and Se2F2 are considered along with corresponding perfluorohalogenoorganoselenium compounds with selenium in the oxidation states 1, 2, 4 and 6.For lower selenium fluorides, preparation and characterisation are emphasized.Recent results in the chemistry of SeCF2, CF3SeCl, CF3SeSeCF3, CF3Se(O)OM and CF3SeVI-compounds are presented.A comparison with the correspondig sulfur chemistry is also provided.
The Molecular Structure of Gaseous Bis(trifluoromethyl)selenium Difluoride as determined by Electron Diffraction
Baxter, Paul L.,Downs, Anthony J.,Forster, Alan M.,Goode, Michael J.,Rankin, David W. H.,Robertson, Heather E.
, p. 941 - 946 (2007/10/02)
The structure of gaseous bis(trifluoromethyl)selenium difluoride has been determined by electron diffraction.Hence the predominant species is shown to be the monomer (CF3)2SeF2 with the CF3 ligands occupying the equatorial sites of a framework derived from a trigonal bipyramid.Salient structural parameters (ra) are: r(Se-F) 182.7(0.5), r(Se-C) 202.2(0.8), and r(C-F) 131.4(0.3) pm; F-Se-F 157.8(3.5), C-Se-C 118.7(1.7), and F-C-Se 108.9(0.4) deg.The molecule has C2 symmetry overall, with the CF3 groups twisted 19.8(1.1) deg away from the positions in which one C-F bond of each group is anti with respect to an Se-C bond (corresponding to a conformation having C2V symmetry overall).Comparisons with the structures of related molecules show that the switch from SeF4 to (CF3)2SeF2, unlike that from SF4 to (CF3)2SF2, results in an increase in the equatorial bond angle, in keeping with the expectations of the valence shell electron pair repulsion model.
Advances in Trifluoromethylselenium(II)- and -selenium(IV)-Chemistry
Haas, Alois,Tebbe, Klaus
, p. 897 - 902 (2007/10/02)
Fluorination of CF3SeCl with AgF leads to CF3Se(O)OH and CF3SeSeCF3 after reactions of the primary products with glass.Condensations of (CF3S)2NH and 2NH with CF3SeCl gave CF3SeN(SCF3)2, and 2NSeCF3, (CF3Se)2NSi(CH3)3, CF3SeN(H)Si(CH3)3, respectively.The reaction of FC(O)SCl with Hg(SeCF3)2 gave besides FC(O)SSeCF3 in smaller quantities also CF3SeSSeCF3.When a mixture of (CF3Se)2NH and Cl3S3N3 is heated to 50 deg C, CF3SeN=S=NSeCF3 is formed.The oxydation of CF3SeCF2X with ClF or m-chloroperbenzoic acid gave CF3Se(O)CF2X (X = F, Cl).Spectroscopical data of the substances are provided. - Key words: Fluorination of CF3SeCl, Reaction of CF3SeN(CH3)2 with HF, Syntheses of CF3SeN=S=NSeCF3 and CF3SeSSeCF3, Oxydation of CF3SeCF2X to CF3Se(O)CF2X, X = F,Cl, Spectroscopical Data
