A COMPARISON OF PROTON AFFINITIES OF NEUTRAL OXYGEN AND SULFUR IN CHELATING LIGANDS

被引：4

作者：

JAMES, TL

KULA, RJ

机构：

[1] Department of Chemistry, University of Wisconsin, Madison

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1969年 / 73卷 / 03期

关键词：

D O I：

10.1021/j100723a026

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The nuclear magnetic resonance chemical shift behaviors of the nonexchanging carbon-bonded proton resonances of various S-alkylthioacelic acids and alkoxyacetic acids were studied in aqueous solution as a function of solvent acidity to determine the relative proton affinities of the donor atoms in such chelating ligands. The relative electron-donating abilities, ascertained from the sites and sequences of protonation, were found to be in the order (Chemical Equation Presented) This order of proton affinity seems to reflect the relative contributions of these donor atoms to the stability of metal chelates for those metal ions with little tendency for the formation of dative π bonds. The suitability of internal references in the strongly acidic solutions used in this investigation was also studied.

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页码：634 / &

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