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A single-crystal X-ray study of trinitrato-cis,syn,cis-2,5,8,15,18,21-hexaoxatricyclo[20,4,0, 09,14]hexacosanelanthanum shows the metal ion to be co-ordinated to six polyether oxygen atoms and three bidentate nitrate ions; structural parameters are discussed.
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Harman et al. (1976) studied this question.
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