The structure of a pentachromium(II) extended metal atom chain at 3 K: Cotton's conjecture proven.
作者信息
Cornia Andrea, Nicolini Alessio, McMonagle Charles J, Probert Michael R
机构信息
Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia & INSTM, I-41125 Modena, Italy.
Chemistry, School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.
出版信息
Dalton Trans. 2022 Nov 15;51(44):16790-16794. doi: 10.1039/d2dt03103e.
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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