Abstract
In dilute aqueous acid solutions (0.05 to 0.5 M H/sup +/), 2-germaacetic acid decomposes to form carbon monoxide, an orange-yellow solid of approximate composition GeH/sub 0/./sub 6/, and small amounts of germane. The rate law for the reaction is -d(GeH/sub 3/COOH)/dt = k(H/sup +/)(GeH/sub 3/COOH); k = (5.59 +- 0.14) x 10/sup -4/M/sup -1/s/sup -1/ at 22.5/sup 0/C and ionic strength 1.0 M. From rate measurements in the temperature interval 0 to 39.5/sup 0/C, the activation energy was determined to be 16.9 kcal/mol. When the reaction is carried out in strongly acidic solutions (e.g., greater than 6 M HCl, greater than 4 M H/sub 2/SO/sub 4/, or greater than 6 M HClO/sub 4/), carbon monoxide is evolved quantitatively, but no solid hydride or germane forms. The resulting solution contains the GeH/sub 3//sup +/ group, probably stabilized in the form of the germyloxonium ion, GeH/sub 3/OH/sub 2//sup +/. The data implicate GeH/sub 2/ as an intermediate of the reaction in dilute acid solutions. 2 figures, 2 tables.
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