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
[PtCl 6 ] 2–的提取和结合研究报道了24种含有三(2-氨基乙基)胺(TREN)或三(3-氨基丙基)胺(TRPN)支架的单,双和三脚架提取剂。这些试剂旨在识别[PtCl 6 ] 2–的外部配位域,并在酸性条件下显示出对氯离子的选择性。从0.6 M HCl提取涉及到含有1、2或3个尿素,酰胺或磺酰胺氢键供体的叔胺中N中心的质子化,以建立以下平衡:2L (org) + 2H + + [PtCl 6 ] 2 –⇌[(LH)2 PtCl6 ] (org)。所有试剂均显示出比三辛胺更高的Pt负载量,三辛胺被用作代表商业三烷基胺试剂的阳性对照。[PtCl 6 ] 2–的负载量取决于萃取剂中酰胺的侧基数量,并遵循三脚架>双足>单足的顺序,含尿素的萃取剂的性能优于酰胺和磺酰胺类似物。不同系列的试剂,其中Tris-2-ethylhexylamine中的一个,两个或三个烷基被3- N'-己基丙酰胺基取代,它们对[PtCl