Accession Number : AD0686014

Title :   COORDINATION OF SILICON TETRAFLUORIDE WITH ALICYCLIC ETHERS AND DIMETHYL ETHER,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) DEPT OF CHEMISTRY

Personal Author(s) : Guertin,J. P. ; Onyszchuk,M.

Report Date : 02 OCT 1967

Pagination or Media Count : 7

Abstract : Tensimetric titrations at -78C of silicon tetrafluoride with ethylene oxide, trimethylene oxide, tetrahydrofuran, tetrahydropyran, and dimethyl ether prove the formation of only 1:2 complexes, SiF4.2(ether). All are unstable at 25C and either dissociate completely, as do SiF4:2(CH2)4O, SiF4.2(CH2)5O, and SiF4.2(CH3)2O, or decompose into SiF4 and a polymethylene oxide polymer, as do SiF4.2(CH2)2O and SiF4.2(CH2)3O. Silicon tetrafluoride does not coordinate with 1,4-dioxane in the range -94 to 25C and less than 1 atm pressure. Condensed phase heats of dissociation of SiF4.2(ether) complexes follow the order (CH2)3O > (CH2)4O > (CH2)5O > or = (CH2)2O > (CH3)2O, which suggests that this is the relative order of basicities towards SiF4. (Author)

Descriptors :   (*SILICON COMPOUNDS, *COMPLEX COMPOUNDS), SYNTHESIS(CHEMISTRY), FLUORIDES, ETHYLENE OXIDE, ETHERS, FURANS, CANADA

Subject Categories : Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE