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The structure of a pentachromium(II) extended metal atom chain at 3 K: Cotton's conjecture proven. | LitMetric
We provide definitive experimental proof that the archetypal string-like compound [Cr(tpda)(NCS)] has alternating long and short Cr-Cr separations in the solid state, as conjectured by F. A. Cotton, rather than essentially equally spaced Cr atoms, as initially claimed (Htpda = ,-di(pyridin-2-yl)pyridine-2,6-diamine). Single-crystal X-ray data collected from 292 to 3 K revealed that the misinterpretation is caused by pseudo-merohedral twinning and that bond length alternation is enhanced at low temperature.
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