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Lanthanide Coordination Polymers Constructed from Infinite Rod-Shaped Secondary Building Units and Flexible Ligands



Three lanthanide coordination polymers constructed from infinite rod-shaped secondary building units (SBUs), [Nd2(H2O)2(cis-chdc)2(trans-chdc)]⋅2H2O (1), Nd2(H2O)4(trans-chdc)3 (2), and [Sm2(H2O)2(cis-chdc)(trans-chdc)2]⋅4H2O (3) (chdcH2=1,4-cyclohexanedicarboxylic acid), were hydrothermally synthesized and structurally characterized. The structures of 13 are modulated by different ratios of the cis and trans configurations of chdc2− ligands, which was achieved by temperature control in the hydrothermal reactions. Crystal-structure analysis revealed that 1 is a four-connected pcu-type rod packing network built from cross-linking of rod-shaped neodymium–oxygen SBUs by cis- and trans-chdc2− ligands in a 2:1 ratio, 2 displays a complicated six-connected hex-type rod packing structure built by connection of rod-shaped neodymium–oxygen SBUs and trans-chdc2− ligands, and 3 features an unprecedented five-connected rod packing pattern constructed from rod-shaped samarium–oxygen SBUs and cis- and trans-chdc2− ligands in a 1:2 ratio.