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Anion binding by metallo-receptors of 5,5′-dicarbamate-2,2′- bipyridine ligands

机译:5,5'-二氨基甲酸酯-2,2'-联吡啶配体的金属受体与阴离子的结合

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摘要

Three 5,5′-dicarbamate-2,2′-bipyridine ligands (L = L ~1-L~3) 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 = Fe~(2+), Cu~(2+), Zn~(2+) or Ru~(2+) gave the complexes ML_nX _2·xG (1-12, n = 1-3; X = Cl, NO_3, ClO_4, BF_4, PF_6, SO_4; G = Et_2O, DMSO, CH_3OH, H_2O), of which [Fe(L~2) _3?SO_4]·8.5H_2O (2), [Fe(L ~1)_3?(BF_4)_2]·2CH _3OH (7), [Fe(L~2)_3?(Et_2O) _2](BF_4)_2·2CH_3OH (8), [ZnCl_2(L~1)][ZnCl_2(L~1)(DMSO)] ·2DMSO (9), [Zn(L~1)_3?(NO_3) _2]·2H_2O (10), [Zn(L~2) _3?(ClO_4)(Et_2O)]ClO_4· Et_2O·2CH_3OH·1.5H_2O (11), and [Cu(L~1)_2(DMSO)](ClO_4)_2·2DMSO (12) were elucidated by single-crystal X-ray crystallography. In the complexes ML_nX_2·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 C_3-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 [RuL_3]~(2+) moiety as a probe. The results show that fluorescent recognition of anion in solution can be achieved by the Ru~(II) complexes which exhibit good selectivities for SO _4~(2-).
机译:合成了三个在氨基甲酸酯取代基上分别带有乙基,异丙基或叔丁基末端的5,5'-二氨基甲酸酯-2,2'-联吡啶配体(L = L〜1-L〜3)。配体L与过渡金属离子M = Fe〜(2 +),Cu〜(2 +),Zn〜(2+)或Ru〜(2+)的反应生成配合物ML_nX _2·xG(1-12 ,n = 1-3; X = Cl,NO_3,ClO_4,BF_4,PF_6,SO_4; G = Et_2O,DMSO,CH_3OH,H_2O),其中[Fe(L〜2)_3→SO_4]·8.5H_2O(2 ),[Fe(L〜1)_3?(BF_4)_2]·2CH _3OH(7),[Fe(L〜2)_3?(Et_2O)_2](BF_4)_2·2CH_3OH(8),[ZnCl_2( L〜1)] [ZnCl_2(L〜1)(DMSO)]·2DMSO(9),[Zn(L〜1)_3?(NO_3)_2]·2H_2O(10),[Zn(L〜2)_3通过单晶X-晶析出α(ClO_4)(Et_2O)] ClO_4·Et_2O·2CH_3OH·1.5H_2O(11)和[Cu(L〜1)_2(DMSO)](ClO_4)_2·2DMSO(12)。射线晶体学。在配合物ML_nX_2·xG中,取决于过渡金属和反应条件,金属离子由n = 1、2或3个螯合联吡啶部分(与n = 1和2的其他阴离子或溶剂配体)配位。有趣的是,氨基甲酸酯官能团参与了与各种客体(阴离子或溶剂)的氢键结合,特别是在具有良好组织的C_3裂隙的三(螯合物)配合物中,有效地包含了客体。此外,使用发光的[RuL_3]〜(2+)部分作为探针,通过荧光滴定研究了溶液中预组织的三(螯合物)配合物的阴离子结合行为。结果表明,Ru〜(II)配合物对SO_4〜(2-)具有良好的选择性,可以实现溶液中阴离子的荧光识别。

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