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Matrix-isolation IR, electronic-absorption, and Au L3-edge EXAFS (extended X-ray absorption fine structure) data have provided the first experimental evidence that the ground-state structure of AuCl3 is not D3h symmetric (trigonal-planar), but rather has a Jahn–Teller-distorted T-shaped geometry (see picture).
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Blackmore et al. (2005) studied this question.
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