Deep violet (tBu3Si)4In2 (1) and black-green (tBu3Si)4Tl2 (2) are formed from MBr and tBu3SiNa in THF at −78 °C [Eq. (a)]. The M atoms of 1 (decomp. 125 °C) and 2 (decomp. 52 °C) are each coordinated by two Si atoms and one M atom in a trigonal-planar fashion, and the two Si2MM planes are orthogonal.
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Wibeŕg et al. (1996) studied this question.
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