| We have designed and synthesized a series of new carboxylate ligands with N. And ten entangled net compounds with Zn or Cd metal (clusters), namely [Zn2(L1)2(bbi)2]·H2O (1), [Cd2(L1)2(bbi)2]·H2O (2), [ZnL2(bbi)]·H2O (3), [CdL2(bbi)0.5] (4), [ZnL3(bbi)]·H2O (5), [CdL3(bbi)0.5]·2H2O (6), [Zn(HL4)2(bbi)] (7), [Cd2(HL4)2(bbi)]·3H2O (8), [ZnL5(bbi)] (9) and [Cd2(L5)2(bbi)]·4.5H2O (10), where bbi=1,4-bis(1H-imidazol-1-yl)butane, have been synthesized on the basis of these new ligands under hydrothermal conditions. The crystal structures have been determined by single-crystal X-ray diffraction. This article represents a systematical examination of their structures.Compounds 1–7 and 9 display 2D layers. Compounds 8 and 10 possess 3D polymeric structures. In 1 and 2, neutral ligand subunits link the metal- L1 to generate a 2-fold parallel interpenetrating net with the 63 topology. Compound 3 possesses 2D layers which are further linked by hydrogen-bonding interaction to form a 3D supramolecular structure. In 4, neutral ligands connect the metal-L2 ligand subunits to give a 2-fold parallel interpenetrating net with (4,4) topology. Compounds 4 display both polyrotaxane and polycatenane characters. In 5, the bbi ligands extend the Zn(II)–L3 chains into 2D sinusoidal-like sql nets. The undulated sql nets polycatenate each other in the parallel manner, yielding a rare 2D→3D parallel polycatenation net. The structure of 6 displays a self-penetrating network, which can be viewed that each bbi(rod) passes a L3 subunit(ring) but all the rods and rings are in the same network. In 7 and 9, neutral ligands connect the various metal-carboxylic ligand with (4,4) topology. 8 possesses a unique (3, 4)-connected 3D framework with (42·6·123)(42·6) topology. The structure of 10 contains 3 interpenetrating diamond networks. The infrared spectra, thermogravimetric and luminescent properties were also investigated in detail for the compounds. |
PDF Full Text Request