| Abstract
| - Stable Ih-symmetric polygermane and polystannane nanostructures have been predicted on the basis of quantumchemical calculations. Structures, stabilities, and electronic properties of cages up to Ge500H500 and Sn500H500were determined. The facets of the icosahedral cages resemble the monolayer sheets of experimentally knownlayered GeH. The stabilities and electronic properties of the cages converge toward the corresponding monolayersheets. Due to their electronic properties, the polygermane and polystannane nanostructures may turn out tobe useful in optical applications.
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