Kinetic study of the complex formation of boric and boronic acids with mono- and diprotonated ligands
作者:Hideaki Ito、Yoko Kono、Akinori Machida、Yoko Mitsumoto、Kenji Omori、Noriko Nakamura、Yuichi Kondo、Koji Ishihara
DOI:10.1016/s0020-1693(02)01268-9
日期:2003.2
Abstract The complex formation reactions of boric and boronic acids (RB(OH) 2 : R=OH, n-Bu, Ph, and m -NO 2 Ph) with 4-isopropyltropolone (Hipt) and chromotropic acid (H 2 cht 2− ) have been studied kinetically at various pH. The reactions of H 2 ipt + with boronic acids were faster than those of Hipt by a factor of 1.5–11, and fully deprotonated ipt − also reacted with m -NO 2 PhB(OH) 2 , but slower
摘要硼酸和硼酸(RB(OH)2:R = OH,n-Bu,Ph和m -NO 2 Ph)与4-异丙基羟甲基吡啶酮(Hipt)和发色酸(H 2 cht 2− )已在各种pH值下进行了动力学研究。H 2 ipt +与硼酸的反应比Hipt的反应快1.5-11倍,并且完全去质子化的ipt-也与m -NO 2 PhB(OH)2反应,但比Hipt慢。四面体的m -NO 2 PhB(OH)3-离子不与Hipt反应。由于质子歧义性出乎意料的问题,无法指定硼酸与发色酸络合的反应路线。硼酸与二齿配体的反应机理从决定螯合环闭环的速率进行了讨论。