Lanthanide complexes with mono- and bicyclic macromolecules. Synthesis and spectroscopic studies
作者:A. Seminara、A. Musumeci
DOI:10.1016/s0020-1693(00)93627-2
日期:1980.1
Abstract Complexes of lanthanide(III) chlorides, thiocyanates, nitrates and perchlorates with three cyclic polyethers containing five or six oxygen atoms in the cycle and two bicyclic macromolecules containing five or six oxygen and two nitrogen atoms in the cycles have been prepared and characterized. Possible arrangements around the cation are proposed on the ground of conductivity measurements,
rotator-stator structures. X-ray crystal-structure analyses revealed a jackknife-shaped conformation of DB[18]crown-6, in which two benzene rings were twisted along the same direction, in (Ph-NH 3 (+))(DB[18]crown-6)[Ni(dmit) 2] (-) ( 1) and (AD-NH 3 (+))(DB[18]crown-6)[Ni(dmit) 2] (-) ( 3), whereas the conformational flexibility of two dicyclohexyl rings was observed in (Ph-NH 3 (+))(DCH[18]crown-6)[Ni(dmit)
Selective Interactions of Crown Ethers with Fluosilicic Complex Acids
作者:Wen-Jwu Wang、E. V. Ganin
DOI:10.1007/s11176-005-0458-9
日期:2005.9
selective interactions of crownethers( hosts ) with guest species, resulting in stabiliza-tion of unstable guest species in the form of stablecrystalline inclusion compounds [7, 8]. In this connec-tion, we examined the possibility of selective syn-thesis of crystalline supramolecular complexes ofcrown ethers with fluosilicic complexacids from solu-tions of crownethers in aqueous HF under the condi-tions
Crystal and Molecular Structures of Ionophore−Siderophore Host−Guest Supramolecular Assemblies Relevant to Molecular Recognition
作者:Suraj Dhungana、Peter S. White、Alvin L. Crumbliss
DOI:10.1021/ja035778+
日期:2003.12.1
alpha = 80.469(3) degrees, beta = 81.481(3) degrees and gamma = 70.212(2) degrees. The crystals of cis-syn-cis-dicyclohexano-18-crown-6:ferrioxamine B host-guest assembly are monoclinic, with space group P2(1)/c, and four molecules per unit cell with dimensions a = 20.1473(13) A, b = 21.5778(15) A, c = 14.8013(10) A, and beta = 94.586(2) degrees. The crystalstructures of all three host-guest assemblies
由18-crown-6和ferrioxamine B、benzo-18-crown-6和ferrioxamine B、cis-syn-cis-dicyclohexano-18-crown-6和ferrioxamine B组成的离子载体-铁载体主客体组装体成功结晶,并通过单晶X射线衍射确定了它们的结构。所有三种晶格还包括溶剂化的 Mg(II) 和高氯酸根离子。离子载体-铁载体主客体组件通过亚铁胺 B 的第二配位球中的侧质子化胺与冠醚中的氢键受体氧原子之间的氢键相互作用非共价结合在一起。18-crown-6:ferrioxamine B主客体组装晶体为单斜晶系,空间群为P2(1)/c,每个晶胞有4个分子,尺寸a = 19.8327(11) A, b = 20.4111(11) A,c = 15.1698(8) A,β = 96。435(1) 度。benzo-18-crown-6:ferrioxamine
Complexes of lanthanoid salts with the crown ether cis,syn,cis-2,5,8,15,18,21-hexaoxatricyclo[20.4.0.0]hexacosane and their paramagnetically shifted nuclear magnetic resonance spectra
作者:Graham A. Catton、Mary E. Harman、F. Alan Hart、Geoffrey E. Hawkes、Gerard P. Moss
DOI:10.1039/dt9780000181
日期:——
Lanthanoid perchlorates form complexes [M(ClO4)3(shoth)] with the title crownether (shoth) whose n.m.r. spectra show shifts which are predominantly dipolar. The magnetic-susceptibility tensors are not axially symmetric.