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3 groups).
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79960898605
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79955057050
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Similar results were recently obtained for a bicyclic [2.2.0] germanium compound. These calculations, however, did not investigate the transitions between the regions depicted in Figure 3
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-3) are close to the tin atoms with coordination number three. The distance between these residual electron densities is around 260 pm, corresponding to a bonded system in region II. Further investigations applying synchrotron radiation may provide a deeper insight if both isomers, that is, the singlet biradicaloid form and the classically bonded 2c2e case, are both present in the solid state.
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