Die Reaktion von [Mo6Cl8]X4 mit N-Basen |
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| Authors: | Joachim Kraft,Harald Sch fer |
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| Affiliation: | Joachim Kraft,Harald Schäfer |
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| Abstract: | ![]()
Reaction of [Mo6Cl8]X4 with N-Bases [Mo6Cl8]X4 (X = Cl, Br, I) in ethanol solution by titration with Ag+ showed 4 labil X atoms. The displacement of X? especially by F? accelerates the titration decisively. Conductivity measurements in ethanol or acetone showed that [Mo6Cl8]X4 at 25°C behave as weak 1:1-electrolytes. Solutions of [Mo6Cl8]X4 in DMF heated up to 60°C and than lowered to 25°C showed that the compounds in this solvent behave as (potential) strong 2:1-valent electrolytes. From the following compounds the labil halides have been determined by titration with Ag+: [Mo6Cl8]X4(Py)2 (X = Cl, Br), [Mo6Cl8]X4(bipy)2 (X = Cl, Br, I), [Mo6Cl8]X4(Phenpy)2 (X = Cl, Br, I), (PyH)2[Mo6Cl8]X6 (X = Cl, Br); (bipyH)2[Mo6Cl8]I4Cl2. Always 4 (respectively 6) labil halides have been observed; exception [Mo6Cl8]Cl4(Py)2 in acetone (2 labil Cl). Lattice constants and mole volumina for the adducts with pyridin and bipyridin have been determined. The adducts with bipyridin and phenylpyridin are isotypic. Conductivity measurements have been made in different solutions. The decomposition on the thermobalance showed that in [Mo6Cl8]Cl4(Py)2 the bond of pyridin is weak. The 2 pyridin molecules are evolved at the same time. However [Mo6Cl8]I4(Bipy)2 loses 1 bipyridin only. (PyH)2[Mo6Cl8]X6 formed during the first decomposition step the novel compounds (PyH) [Mo6Cl8]X5 (X = Cl, Br). Both compounds are isotypic. They behave in ethanol solution as strong 1:1-valent electrolytes. |
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