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Keywords:

  • 2,2′-bipyridine;
  • (4,6)-connected topology;
  • crystal structure;
  • coordination polymers;
  • metal–organic frameworks

Abstract

Five new coordination polymers based on a new 2,2′-bipyridine derived ligand N,N′-bis(pyridin-4-yl)-2,2′-bipyridine-5,5′-dicarboxamide (=L) are reported herein. Isostructural three-dimensional coordination polymers with a rare (4,6)-connected network of {44.62}3{46.89}2 topology were synthesised from Cu(NO3)2, Zn(NO3)2 or a mixture of Cu(NO3)2/Fe(BF4)2 with L in complexes {[Cu5L6]⋅(NO3)10⋅(H2O)18} (1), {[Zn5L6]⋅(NO3)10⋅(H2O)18} (2) and {[FexCuyL6]⋅(NO3)10⋅(H2O)18} (3; where x+y=5). Complexes with two-dimensional grid structures resulted from treatment with CoCl2 or Cd(NO3)2 with L in complexes {[CoLCl2]⋅DMF} (4) and {CdL(NO3)2} (5).