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Achiral channels as well as left- and right-handed helical tubes are present in novel lanthanide-organic frameworks prepared under hydrothermal conditions from lanthanide oxides. In the three-dimensional coordination polymers, the Ln atoms (Ln=Eu, Dy, Y, Pr, Nd, Sm, Gd, Tb, Er) are linked by 4,5-imidazoledicarboxylic acid ligands with skew coordination orientation (see picture).
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Sun et al. (2005) studied this question.
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