A “one-legged thallium” is observed in the arylthallium(I) compound 2,6-Trip2C6H3Tl (Trip=2,4,6-iPr3C6H2), which was synthesized from the corresponding organolithium compound and thallium chloride. X-ray structure analysis reveals that 2,6-Trip2C6H3Tl is monomeric in the solid state and contains a singly coordinated thallium atom (see space-filling model on the right).
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Niemeyer et al. (1998) studied this question.