作者:Biao Wu、Jin Yang、Xiaojuan Huang、Shaoguang Li、Chuandong Jia、Xiao-Juan Yang、Ning Tang、Christoph Janiak
DOI:10.1039/c0dt01561j
日期:——
Three 5,5â²-dicarbamate-2,2â²-bipyridine ligands (L = L1âL3) bearing ethyl, isopropyl or tert-butyl terminals, respectively, on the carbamate substituents were synthesized. Reaction of the ligands L with the transition metal ions M = Fe2+, Cu2+, Zn2+ or Ru2+ gave the complexes MLnX2·xG (1â12, n = 1â3; X = Cl, NO3, ClO4, BF4, PF6, ½SO4; G = Et2O, DMSO, CH3OH, H2O), of which [Fe(L2)3âââSO4]·8.5H2O (2), [Fe(L1)3âââ(BF4)2]·2CH3OH (7), [Fe(L2)3âââ(Et2O)2](BF4)2·2CH3OH (8), [ZnCl2(L1)][ZnCl2(L1)(DMSO)]·2DMSO (9), [Zn(L1)3âââ(NO3)2]·2H2O (10), [Zn(L2)3âââ(ClO4)(Et2O)]ClO4·Et2O·2CH3OH·1.5H2O (11), and [Cu(L1)2(DMSO)](ClO4)2·2DMSO (12) were elucidated by single-crystal X-ray crystallography. In the complexes MLnX2·xG the metal ion is coordinated by n = 1, 2 or 3 chelating bipyridine moieties (with other anionic or solvent ligands for n = 1 and 2) depending on the transition metal and reaction conditions. Interestingly, the carbamate functionalities are involved in hydrogen bonding with various guests (anions or solvents), especially in the tris(chelate) complexes which feature the well-organized C3-clefts for effective guest inclusion. Moreover, the anion binding behavior of the pre-organized tris(chelate) complexes was investigated in solution by fluorescence titration using the emissive [RuL3]2+ moiety as a probe. The results show that fluorescent recognition of anion in solution can be achieved by the RuII complexes which exhibit good selectivities for SO42â.
合成了三种5,5'-二氨基甲酸酯-2,2'-联吡啶配体(L = L1–L3),分别在氨基甲酸酯取代基上带有乙基、异丙基或三丁基末端。将配体L与过渡金属离子M = Fe2+、Cu2+、Zn2+或Ru2+反应,得到了复合物MLnX2·xG(1–12,n = 1–3;X = Cl、NO3、ClO4、BF4、PF6、½SO4;G = Et2O、DMSO、CH3OH、H2O),其中[Fe(L2)3·SO4]·8.5H2O(2)、[Fe(L1)3·(BF4)2]·2CH3OH(7)、[Fe(L2)3·(Et2O)2](BF4)2·2CH3OH(8)、[ZnCl2(L1)][ZnCl2(L1)(DMSO)]·2DMSO(9)、[Zn(L1)3·(NO3)2]·2H2O(10)、[Zn(L2)3·(ClO4)(Et2O)]ClO4·Et2O·2CH3OH·1.5H2O(11)、[Cu(L1)2(DMSO)](ClO4)2·2DMSO(12)通过单晶X射线晶体学得到了阐明。在复合物MLnX2·xG中,金属离子由n = 1、2或3个螯合联吡啶基团配位(对于n = 1和2,可存在其他阴离子或溶剂配体),具体取决于过渡金属及反应条件。有趣的是,氨基甲酸酯功能团参与了与各种客体(阴离子或溶剂)的氢键作用,特别是在具有良好组织的C3-凹槽的三重(螯合)复合物中,以有效包裹客体。此外,利用荧光滴定法,以发光的[RuL3]2+基团作为探针,研究了预组装的三重(螯合)复合物在溶液中的阴离子结合行为。结果表明,RuII复合物可以在溶液中实现对阴离子的荧光识别,并对SO42-表现出良好的选择性。