Chemical Mustard Containment Using Simple Palladium Pincer Complexes: The Influence of Molecular Walls
摘要:
Six amide-based NNN palladium(II) pincer complexes Pd(L)(CH3CN) were synthesized, characterized, and examined for binding the sulfur mustard surrogate, 2-chloroethyl ethyl sulfide (CEES). The complexes all bind readily with CEES as shown by 'H NMR spectroscopy in CDCl3. The influence of parasubstituents on the two amide phenyl appendages was explored as well as the effect of replacing the phenyl groups with larger aromatic rings, 1-naphthalene and 9-anthracene. While variations of the parasubstituents had only a slight influence on the binding affinities, incorporation of larger aromatic rings resulted in a significant size-related increase in binding, possibly due to increasing steric and electronic interactions. In crystal structures of three CEES-bound complexes, the mustard binds through the sulfur atom and lies along the aromatic walls of the side appendages approximately perpendicular to the pincer plane, with increasingly better alignment progressing from phenyl to 1-naphthalene to 9-anthracene.
amines. For the obtained receptors, selective binding of lead(II) and copper(II) was found. Ion–receptor interactions were studied using UV–vis spectroscopy, spectrofluorimetry, 1H NMR and FTIR spectroscopy. The reversible lead(II) and copper(II) binding was discussed in regard of type of aromatic residue and amide bond localisation in aromatic ring, and binding model was proposed.
2,6-Bis[<i>N</i>-(8-quinolyl)carbamoyl]pyridine as a Highly Selective Extractant for Cu(II)
作者:Kazuhisa Hiratani、Kazuhiro Taguchi
DOI:10.1246/bcsj.63.3331
日期:1990.11
Pyridinederivatives containing two 8-quinolyl-amino groups were newly synthesized for heavy metal ion-cheletion. It was shown in solventextraction that 2, 6-bis[N,N′-(8-quinolyl)aminocarbonyl]pyridine can extract only Cu(II) with excellent selectivity and efficiency from the aqueous phase(pH 6.2) containing Cu(II), Ni(II), Co(II), and Zn(II) into the chloroform phase.
Fast Carbon Dioxide Fixation by 2,6-Pyridinedicarboxamidato-nickel(II)-hydroxide Complexes: Influence of Changes in Reactive Site Environment on Reaction Rates
作者:Deguang Huang、Olga V. Makhlynets、Lay Ling Tan、Sonny C. Lee、Elena V. Rybak-Akimova、R. H. Holm
DOI:10.1021/ic200942u
日期:2011.10.17
bicarbonate product complexes [NiII(pyN2R2)(HCO3)]− having η1-OCO2H ligation. Fixation reactions follow second-order kinetics (rate = k2′[NiII–OH][CO2]) with negative activation entropies (−17 to −28 eu). Reactions were monitored by growth and decay of metal-to-ligand charge-transfer (MLCT) bands at 350–450 nm. The rate order R = Me > macro > Et > Pri > Bui > Ph at 298 K (macro = macrocylic pincer ligand)
含有末端羟基的平面络合物[Ni II(pyN 2 R2)(OH)] -可以容易地由N,N '-(2,6-C 6 H 3 R 2)-2,6-吡啶二甲酰胺酸盐制备(2-)三齿钳状配体(R 4 N)(OH)和Ni(OTf)2。这些配合物在DMF中的溶液二氧化碳干净和完全反应在CO的过程2的固定与形成碳酸氢盐产物配合物[镍II(PYN 2 R2)(HCO 3)] -具有η 1 -OCO2 H结扎。固定反应遵循具有负激活熵(-17至-28 eu)的二级动力学(速率= k 2 '[Ni II -OH] [CO 2 ])。通过在350–450 nm的金属至配体电荷转移(MLCT)谱带的生长和衰减来监控反应。298 K时的速率顺序R = Me>宏观> Et> Pr i > Bu i > Ph(宏观=大环钳形配体)反映了反应位点的空间位阻增加。这些复合物的固有的高反应性性质如下从ķ 2 '≈10 6中号-1小号-1对于R
Ruthenium(II) complexes derived from the ligands having carboxamide groups: Reactivity and scavenging of nitric oxide (NO)
作者:Kaushik Ghosh、Sushil Kumar、Rajan Kumar、Udai P. Singh
DOI:10.1016/j.jorganchem.2013.10.054
日期:2014.1
Two novel ruthenium(II) complexes [Ru-II(L-1)(PPh3)(2)(CO)] (1) and [Ru-II(L-3)(PPh3)(2)(DMF)] (2) derived from the carboxamide ligands (LH2)-H-1 and (LH2)-H-2 respectively (where (LH2)-H-1 = N-2,N-6-dip-tolylpyridine-2,6-dicarboxamide and (LH2)-H-2 = N-2,N-6-di(naphthalen-1-yl)pyridine-2,6-dicarboxamide) were synthesized and characterized. Molecular structures of complexes 1 center dot CH3OH and 2 center dot DMF were authenticated using Xray crystallographic studies. Both the complexes were characterized using IR, UV-vis, elemental analysis, NMR and ESI-mass spectral studies. Electrochemical studies were performed to investigate the redox properties. Nitric oxide (NO) scavenging activity of these complexes was also observed with the help of Griess reagent reaction. (C) 2013 Elsevier B. V. All rights reserved.