Coordination assemblies of CdII/ZnII/CoII with the 3-(pyridin-4-yl) benzoate tecton: Structural diversity and properties

Three novel coordination polymers{[CdL2(HL)(H2O)]·(H2O)}n (1), [Zn2(OH)L3]n (2) and [CoL2(H2O)]n (3) have been hydrothermally synthesized from M(NO3)2·nH2O (MII = CdII, ZnII and CoII) and an unsymmetrical tecton 3-(pyridin-4-yl) benzoic acid (HL). All complexes show interesting structural patterns, namely, unprecedented 1D double-stranded supramolecular clasp for , novel (3,5,6)-connected helical tubular double layer for , 2-fold interpenetrating cds network for 3. The fluorescent and thermal properties of complexes , and/or have also been investigated.