Enhanced Guest Affinity and Enantioselectivity through Variation of the Gd<sup>3+</sup>[15-Metallacrown-5] Side Chain
作者:Joseph T. Grant、Joseph Jankolovits、Vincent L. Pecoraro
DOI:10.1021/ic300110g
日期:2012.8.6
generated by their ligand sidechains. A thermodynamic study on Gd3+[15-metallacrown-5] hosts with ligands bearing phenyl sidechains containing 0, 1, and 2 methylene spacers (1-pgHA, 1-pheHA, 1-hpheHA, respectively) is presented to quantitatively assess how guest affinity and chiral selectivity can be enhanced through changes to the ligand sidechain. Guest binding affinity was measured with cyclic
研究了可逆结合客体的超分子宿主潜在的催化和分离应用。手性Ln 3+ [15-金属内酰胺-5]金属配体在其配体侧链产生的疏水腔中结合羧酸盐客体。钆的热力学研究3+ [15-metallacrown-5]与主机配体带有含0,1和2个亚甲基隔片(苯基侧链1- pgHA,1 -pheHA,1 -hpheHA,分别地)呈现给定量评估如何通过改变配体侧链来增强客体亲和力和手性选择性。使用二茂铁羧酸盐作为氧化还原探针,通过循环伏安法测量客体结合亲和力。ķ一羧酸二茂铁与1 -pgHA和1 -pheHA之间的值分别为4800±400 M –1和4400±700 M –1。用1 -hpheHA测得的结合亲和力显着增强,为12100±700 M –1,这是由于较长的侧链更完全地包裹了客体。用苯甲酸酯观察到类似的趋势。侧链还影响对映选择性,因为测得的K S / K R值高达2.2±0.6。依赖于侧链的客体结合支持高选择性Ln
Preparation and Characterization of Chiral Copper 12-Metallacrown-4 Complexes, Inorganic Analogues of Tetraphenylporphyrinatocopper(II)
作者:Jason A. Halfen、Jeffrey J. Bodwin、Vincent L. Pecoraro
DOI:10.1021/ic9807386
日期:1998.10.1
Chiral 12-metallacrown-4 complexes can now be obtained in high yield using resolved beta-phenylalanine hydroxamic acids as organic scaffolding. These new copper(II) compounds bear a striking resemblance based on size and shape to Cu(II) tetraphenylporphyrin. This suggests that metallacrowns may be useful alternatives to metalloporphyrins in future applications which require high metal densities and well-defined chiral centers.
Influencing the Size and Anion Selectivity of Dimeric Ln<sup>3+</sup>[15-Metallacrown-5] Compartments through Systematic Variation of the Host Side Chains and Central Metal
作者:Joseph Jankolovits、Choong-Sun Lim、Gellert Mezei、Jeff W. Kampf、Vincent L. Pecoraro
DOI:10.1021/ic202347j
日期:2012.4.16
Ln3+[15-metallacrown-5] compartmentsselectively recognize carboxylates through guest binding to host metal ions and intermolecular interactions with the phenyl side chains. A systematic study is presented on how the size, selectivity, and number of encapsulated guests in the dimeric containers is influenced by the Ln3+[15-metallacrownCu(II)-5] ligand side chain and central metal. Compartments of varying heights