Directed supramolecular assembly of Cu(<scp>ii</scp>)-based “paddlewheels” into infinite 1-D chains using structurally bifunctional ligands
作者:Christer B. Aakeröy、Nate Schultheiss、John Desper
DOI:10.1039/b513765a
日期:——
The construction of Cu(II)-containing supramolecular chains is achieved by combining suitable anionic ligands (for controlling the coordination geometry and for creating a neutral building block) with four new bifunctional ligands containing a metal-coordinating pyridyl site and a self-complementary hydrogen-bonding moiety. Seven crystal structures are presented and in each case, the copper(II) complex displays a âpaddlewheelâ arrangement, with four carboxylate ligands occupying the equatorial sites, leaving room for the bifunctional ligand to coordinate in the axial positions. The supramolecular chemistry, which organizes the coordination-complexes into the desired infinite 1-D chains, is driven by a combination of NâHâ¯N and NâHâ¯O hydrogen-bonds in five of the seven structures.
Establishing Amide···Amide Reliability and Synthon Transferability in the Supramolecular Assembly of Metal-Containing One-Dimensional Architectures
作者:Christer B. Aakeröy、Benjamin M. T. Scott、Michelle M. Smith、Joaquin F. Urbina、John Desper
DOI:10.1021/ic801992t
日期:2009.5.4
On the basis of a combination of new structural data (eleven single-crystal structure determinations are presented) and information from the Cambridge Structural Database, it has been shown that self-complementary hydrogen-bond based amide center dot center dot center dot amide dimers can be relied upon as effective supramolecular synthons for the assembly and organization of acac- and paddle-wheel complexes of a variety of metal(II) ions. The targeted molecular recognition event and intended extended one-dimensional motif appear with a supramolecular yield of 78% (a total of 28 structures were examined). Despite the fact that the hydrogen bonds that give rise to the R-2(2)(8) motif can be disrupted by both carboxylate- and acac-ligands, as well as by solvent molecules, they remain remarkably resilient and therefore represent useful synthetic tools in inorganic crystal engineering.
Spectral and magnetic characterisation of copper(II) 2-halogenobenzoates with 1-phenyl-2,3-dimethyl-5-pyrazolone and 1,4-dioxane
作者:Milan Melnik、Jerzy Mroziński
DOI:10.1016/0022-2860(79)80238-0
日期:1979.1
Abstract We describe the preparation of the compounds Cu(2-XC 6 H 4 COO) 2 L (X = F, Cl or Br; L = 1-phenyl-2,3-dimethyl-5-pyrazolone or 1,4-dioxane), and compare their spectral and magnetic behaviour with those of binuclear copper(II) acetate monohydrate. The available evidence supports a binuclear structure. The EPR spectra of the powdered solids is consistent with a spin of S = 1. The values of
摘要 我们描述了化合物 Cu(2-XC 6 H 4 COO) 2 L(X = F、Cl 或 Br;L = 1-苯基-2,3-二甲基-5-吡唑啉酮或 1,4-二恶烷)的制备),并将它们的光谱和磁性能与双核乙酸铜 (II) 一水合物的光谱和磁性能进行比较。现有证据支持双核结构。粉末固体的 EPR 谱与 S = 1 的自旋一致。三重态和单重态之间的能量分离值 (-2 J ) 表明二恶烷加合物的反铁磁相互作用比 1 -苯基-2,3-二甲基-5-吡唑啉酮加合物。