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

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Abstract
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 1–3 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.
Funding Information
  • 973 Program (2006CB932900)
  • NSFC (90206040, 20325106, 20521101)
  • NSF of Fujian Province (2005HZ01-1, E0520003, 2005J058, 2006F3134)
  • CAS

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