Fixed in the SiO2 cage at temperatures below 485 K, the [CoCp2]+ ion in the cobaltocenium fluoride nonasil 1 exhibits no rotational disorder. This unusual structural feature for clathrasils is attributed to strong CH…︁OSi interactions, among them hydrogen bonds with a H…︁O distance of 2.31 Å.
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Behrens et al. (1996) studied this question.
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