Coordinatively Unsaturated Metallates of Cobalt(II), Nickel(II), and Zinc(II) Guarded by a Rigid and Narrow Void
作者:Christopher D. Hastings、Lucy S. X. Huffman、Chandan Kumar Tiwari、Jolaine Galindo Betancourth、William W. Brennessel、Brandon R. Barnett
DOI:10.1021/acs.inorgchem.3c01335
日期:2023.7.31
is generally difficult owing to the flexibility inherent in most small molecular species. Herein, we report the synthesis of a tripodal ligand scaffold that orients a narrow and rigid cavity atop accessible metal coordination space. The permanent void is formed through a macrocyclization reaction whereby the 3,5-dihydroxyphenyl arms are covalently linked through methylene bridges. Deprotonative metallation
天然酶系统和合成多孔材料催化剂都利用明确且均匀的通道来根据尺寸或形状来决定反应选择性。由于大多数小分子物种固有的灵活性,在均相系统中模拟这种设计元素通常很困难。在此,我们报告了三足配体支架的合成,该支架在可接近的金属配位空间顶部定向狭窄且刚性的空腔。永久空隙是通过大环化反应形成的,其中3,5-二羟基苯基臂通过亚甲基桥共价连接。去质子金属化产生二价钴、镍和锌的阴离子和配位不饱和络合物。还报道了一系列类似的带有三足配体的非大环化变体的三角单锥体复合物。使用多种光谱技术(NMR、EPR 和 UV-vis)、循环伏安法和 X 射线衍射对配位化合物进行了物理表征。大环化[L OCH2O ] 3-配体的配合物在金属化时保留刚性空腔,该空腔保护开放轴配位位点的入口。通过光谱和计算研究的结合,表明乙腈进入空隙在空间上被排除,破坏了腔内部位的预期协调。
A Comparison of the Selectivity of Extraction of [PtCl<sub>6</sub>]<sup>2–</sup> by Mono-, Bi-, and Tripodal Receptors That Address Its Outer Coordination Sphere
作者:Rebecca J. Warr、Katherine J. Bell、Anastasia Gadzhieva、Rafel Cabot、Ross J. Ellis、Jy Chartres、David K. Henderson、Eleni Lykourina、A. Matthew Wilson、Jason B. Love、Peter A. Tasker、Martin Schröder
DOI:10.1021/acs.inorgchem.6b00848
日期:2016.6.20
Extraction and binding studies of [PtCl6]2– are reported for 24 mono-, bi-, and tripodal extractants containing tris(2-aminoethyl)amine (TREN) or tris(3-aminopropyl)amine (TRPN) scaffolds. These reagents are designed to recognize the outer coordination sphere of [PtCl6]2– and to show selectivity over chloride anion under acidic conditions. Extraction from 0.6 M HCl involves protonation of the N-center
Selective Extraction and Transport of the [PtCl<sub>6</sub>]<sup>2−</sup>Anion through Outer-Sphere Coordination Chemistry
作者:Rebecca J. Warr、Arjan N. Westra、Katherine J. Bell、Jy Chartres、Ross Ellis、Christine Tong、Timothy G. Simmance、Anastasia Gadzhieva、Alexander J. Blake、Peter A. Tasker、Martin Schröder
DOI:10.1002/chem.200802377
日期:2009.5.4
recovery: Tripodal receptors incorporating urea, amido or sulfonamido hydrogen‐bond donors show high loading and selectivity for extraction of [PtCl6]2− over chloride (present in 60‐fold excess) from a low pH aqueous phase to organic media (see figure). The formation of neutral 2:1 [LH]+/[PtCl6]2− packages in organic solvents is supported by single‐crystal X‐ray structure determinations.