Cooperative Effect of Anion and Mole Ratio on the Coordination Modes of an NO2S3-Donor Macrocycle
摘要:
Synthesis of an NO2S3-macrocycle (L) incorporating a pyridine subunit and its anion and/or mole ratio-dependent coordination modes in the formations of mercury(II) complexes is reported. When the mercury(II) salts with different anions (ClO4- or Br-) were reacted with L, the Hg(ClO4)(2) afforded a typical endocyclic complex [HgL](ClO4)(2) (1). Meanwhile, the HgBr2 gave an exocyclic complex [HgLBr2] (2) in which the metal ion exists outside the macrocyclic cavity. The observed anion effect on the coordination modes can be explained by the anion coordination ability toward the metal cation. In the mole ratio variation experiments, notably, the use of 1.5 equiv or above of HgBr2 in the same reaction condition gave a unique endo/exocyclic dumbbell-type complex 3, [Hg4L2Br6][Hg2Br6]. However, the formation of the endocyclic Hg(ClO4)(2) complex 1 shows no mole ratio dependency. To monitor the observed mole ratio-dependent exocoordination products as well as their reactivities and reversibility, systematic powder X-ray diffraction (PXRD) analysis was also applied. From single crystal X-ray and PXRD analyses, it was found that endocyclic complex 1 is not reactive, but complexes 2 and 3 are reactive and show the reversibility between them in the presence of the corresponding reactants.
Cooperative Effect of Anion and Mole Ratio on the Coordination Modes of an NO2S3-Donor Macrocycle
摘要:
Synthesis of an NO2S3-macrocycle (L) incorporating a pyridine subunit and its anion and/or mole ratio-dependent coordination modes in the formations of mercury(II) complexes is reported. When the mercury(II) salts with different anions (ClO4- or Br-) were reacted with L, the Hg(ClO4)(2) afforded a typical endocyclic complex [HgL](ClO4)(2) (1). Meanwhile, the HgBr2 gave an exocyclic complex [HgLBr2] (2) in which the metal ion exists outside the macrocyclic cavity. The observed anion effect on the coordination modes can be explained by the anion coordination ability toward the metal cation. In the mole ratio variation experiments, notably, the use of 1.5 equiv or above of HgBr2 in the same reaction condition gave a unique endo/exocyclic dumbbell-type complex 3, [Hg4L2Br6][Hg2Br6]. However, the formation of the endocyclic Hg(ClO4)(2) complex 1 shows no mole ratio dependency. To monitor the observed mole ratio-dependent exocoordination products as well as their reactivities and reversibility, systematic powder X-ray diffraction (PXRD) analysis was also applied. From single crystal X-ray and PXRD analyses, it was found that endocyclic complex 1 is not reactive, but complexes 2 and 3 are reactive and show the reversibility between them in the presence of the corresponding reactants.
Endocyclic and Endo–Exocyclic Silver(I) Complexes of Thiaoxaaza Macrocycles: Crystallographic and NMR Studies
作者:Yunji Kang、Hyeong-Hwan Lee、Huiyeong Ju、Eunji Lee、Seulgi Kim、Joon-Hwa Lee、In-Hyeok Park、Shim Sung Lee
DOI:10.1071/ch16467
日期:——
comparative investigation of the coordination behaviour of a 19-membered NO2S2-macrocycle (L1) and a 20-membered NO2S3-macrocycle (L2) is reported. On silver(i) complexation, L1 yields a discrete endocyclic mononuclear complex, whereas L2 affords a one-dimensional coordination polymer in which the endo-coordinated macrocyclic complex units are linked by silver(i) ions outside the cavity via endo–exo-coordination
报道了对19元NO 2 S 2-大环(L 1)和20元NO 2 S 3-大环(L 2)的配位行为的比较研究。在银(i)络合上,L 1产生离散的环内单核络合物,而L 2提供一维配位聚合物,其中内配位的大环络合物单元通过腔内外腔通过腔外的银(i)离子连接-协调。较大的环形腔以及L 2的柔性可能会导致较弱的环内络合,并促进环外协调。然而,在针对相应复杂系统的NMR滴定研究中,未观察到环外配位的证据。相反,L 1和L 2形成稳定的环内1:1硝酸银(i)硝酸盐络合物,对前一个配体具有更高的亲和力。