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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >The interaction between ketamine and some crown ethers in common organic solvents studied by NMR: The effect of donating atoms and ligand structure
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The interaction between ketamine and some crown ethers in common organic solvents studied by NMR: The effect of donating atoms and ligand structure

机译:核磁共振研究氯胺酮与普通有机溶剂中某些冠醚之间的相互作用:给原子和配体结构的影响

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摘要

H-1 NMR spectroscopy was used to investigate the stoichiometry and stability of the drug ketamine cation complexes with some crown ethers, such as 15-crown-5 (15CS), aza-15-crown-5 (A15C5), 18-crown-6 (18C6), aza-18-crown-6 (A18C6), diaza-18-crown-6 (DA18C6), dibenzyldiaza-18-crown-6 (D13zDA18C6) and cryptant [2,2,2] (C222) in acetonitrile (AN), dimethylsulfoxide (DMSC) and methanol (MeOH) at 27 degrees C. In order to evaluate the formation constants of the ketamine cation complexes, the CH3 protons chemical shift (on the nitrogen atom of ketamine) was measured as function of ligand/ketamine mole ratio. The formation constant of resulting complexes were calculated by the computer fitting of chemical shift versus mole ratio data to appropriate equations. A significant chemical shift variation was not observed for 15C5 and 18C6. The stoichiometry of the mono aza and diaza ligands are 1:1 and 1:2 (ligand/ketamine), respectively. In all of the solvents studied, DA18C6 formed more stable complexes than other ligands. The solvent effect on the stability of these complexes is discussed. (c) 2005 Elsevier B.V. All rights reserved.
机译:H-1 NMR光谱用于研究药物氯胺酮阳离子配合物与某些冠醚的化学计量和稳定性,例如15冠5(15CS),氮杂15冠5(A15C5),18冠5 6(18C6),zaza-18-crown-6(A18C6),diaza-18-crown-6(DA18C6),二苄基diaza-18-crown-6(D13zDA18C6)和加密剂[2,2,2](C222)在乙腈(AN),二甲基亚砜(DMSC)和甲醇(MeOH)在27摄氏度下进行。为了评估氯胺酮阳离子配合物的形成常数,测量了CH3质子的化学位移(在氯胺酮的氮原子上)作为配体/氯胺酮的摩尔比。通过计算机将化学位移对摩尔比的数据与适当的方程式进行计算机拟合,计算出所得配合物的形成常数。 15C5和18C6未观察到明显的化学位移变化。单氮杂和二氮杂配体的化学计量分别为1:1和1:2(配体/氯胺酮)。在所有研究的溶剂中,DA18C6形成比其他配体更稳定的络合物。讨论了溶剂对这些配合物稳定性的影响。 (c)2005 Elsevier B.V.保留所有权利。

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