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Item Description Ronan, Richard Joseph en_US 2009-09-09T19:24:48Z 2009-09-09T19:24:48Z 1970 en_US
dc.description Typescript. en_US
dc.description Thesis (Ph. D.)--University of Hawaii, 1970. en_US
dc.description Bibliography: leaves [112]-116. en_US
dc.description x, 116 l illus., tables en_US
dc.description.abstract The Bronsted and Lewis basicity of R2NBX3- (where R=H, CH3 and X=Cl, F) has been measured using aqueous, non-aqueous, and tensimetric titrations of R2NBX3- or R2HNBX3. Neither (CH3)2HNBF3 nor (CH3)2NBF3- could be successfully titrated in aqueous solution implying a pK for both compounds of about 7. H3NBF3 , CH3H2NBF3 , and (CH3)2HNBF3 could be titrated in pyridine. The experimental half neutralization potentials of 172 mv, 133 mv, and 189 mv respectively demonstrate that the acidity of the amine-BF3 complexes go through a minimum at CH3H2NBF3. This behavior has been rationalized by analogy to the methylammonium ions whose acidity goes through a minimum at (CH3)2NH2+. The methylamine-BH3 complexes could not be titrated in pyridine demonstrating that they are much weaker acids than the corresponding BF3 complexes. Low temperature tensimetric titrations of (CH3)2NBF3- and (CH3)2NBCl3- using as reference acid BF3 indicate that a weak complex, (CH3)2N(BF3)2-, forms while (CH3)2N(BC13)(BF3) cannot be observed. Thus, (CH3)2NBF3- is a stronger Lewis base than is (CH3)2NBC13-. These data have been interpreted to imply that the relative acceptor strengths of the BX3 groups BH3<BF3<BCl3. Preparative routes to the flew anions (CH3)2NBX3- have been developed. Both alkali metal reduction of (CH3)2HNBX3 and direct reaction of ø3CN(CH3)2 with BX3 have been employed in their synthesis. en_US
dc.language.iso en-US en_US
dc.publisher [Honolulu] en_US
dc.relation Theses for the degree of Doctor of Philosophy (University of Hawaii (Honolulu)). Chemistry; no. 316 en_US
dc.rights All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. en_US
dc.subject Boron compounds en_US
dc.subject Halides en_US
dc.title Acceptor strength of co-ordinated boron halides en_US
dc.type Thesis en_US
dc.type.dcmi Text en_US

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