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- W2019942939 abstract "Boron trifluoride adds to many Lewis bases to form 1:1 molecular addition compounds. Under favorable conditions, some of these adducts may be used to fractionate the isotopes of boron by means of the following reaction: Donor·11BF3(l)+10BF3(g)=Donor·10BF3(l)+11BF3(g).The equilibrium constants for this reaction vary with donor, donor substituents, and temperature. At 30°C the following order is observed: (C2H5)2S> (CH3)2S>(CH3)2Se>(C4H9)2S>(C2H5)2O>C6H5OCH3>(CH3)2O≥(CH2)4O>C6H5OH>(C2H5)3N. The ``anomalous'' concentration of boron-10 in the molecular addition compound may be explained by the unique chemistry of the boron and fluorine atoms. A model is proposed which accounts for observed variations in the isotopic fractionation factor when different donors are used, as well as when different substituents are present on a selected donor. The model also explains the isotopic behavior of other boron halides." @default.
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- W2019942939 date "1967-10-15" @default.
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- W2019942939 title "Fractionation of Boron Isotopes between Boron Trifluoride and Its Molecular Addition Compounds" @default.
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