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A unique feature among polyhedron frameworks of boron group elements is exhibited by the In12 framework of the black-violet dodecaindane R*8In12 (R*=SitBu3), which can be obtained by the thermolysis of R*2In−InR*2. The molecular structure of R*8In12 (tBu groups omitted in picture shown) can be described as a combination of two R*4In6 octahedral building blocks and can thus be classified as a conjuncto dodecaindane.
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Wibeŕg et al. (1999) studied this question.
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