科研之友
微信
新浪微博
Facebook
分享链接
摘要
By simply introducing different alkali metal ions as structure-directing agents, four new coordination polymers with the formulae [Cd-3(BDC-F-4)(3)(DMF)(2)(MeOH)(6)](n) (1), [Cd(BDC-F-4)(DMF)(2)(H2O)(2)](n) (2), [Zn2Na2(BDC-Cl-4)(3)(DMF)(4)(mu(2)-MeOH)](n) (3) and [ZnK(BDC-Cl-4)(1.5)(DMF)(Me2NH)](n) (4) (BDC-F-4 = 2,3,5,6-tetrafluoro-benzenedicarboxylate; BDC-Cl-4 = 2,3,5,6-tetrachloro-benzenedicarboxylate; DMF = dimethylformamide and Me2NH = dimethylamine) have been synthesized and structurally characterized. Complex 1 presents an open three-dimensional (3D) 3-nodal (3,4)-connected framework, 2 has a one-dimensional (1D) chain structure, 3 features a 3D 4-nodal (3,4,5,6)-connected coordination network constructed from the new Zn-II-Na-I heterometallic tetranuclear cluster, and 4 shows a 3D 4-nodal (3,5,6)-connected network based on the unique Zn-II-K-I heterometallic tetranuclear cluster. The results reveal the significant influence of alkali-metal ions on the structural topologies of complexes 1-4. Interestingly, compounds 1-4 all exhibit high water solubility, and futher evaporation of their water solution will result in a 1D coordination polymer {[Cd-4(BDC-F-4)(4)(H2O)(11)]center dot 3.5H(2)O}(n) (5) consisting of the unprecedented polymeric [Cd-II-H2O](n) chain, and a zero-dimensional (0D) complex [Zn(H2O)(6)]center dot(BDC-Cl-4)center dot 4H(2)O (6) containing the discrete [Zn(H2O)(6)](2+) cationic and BDC-Cl-4 dianionic moieties. Furthermore, the solution chemistry of complexes 5 and 6 has been investigated by electrospray ionization (ESI) mass spectrometry and molar electrical conductivity. The photoluminescent properties of complexes 1-6 have also been explored, which interestingly indicate a strong blue emission of complex 1 in the solid state at room temperature.
