A 11B NMR study of zwitterionic and cationic monoborate complexes with cationic 1,2-diol ligands
作者:Michael A. Beckett、Catherine C. Bland、K. Sukumar Varma
DOI:10.1016/j.poly.2008.04.007
日期:2008.6
ratio in aqueous solution has been studied by 11 B NMR spectroscopy and the equilibrium species present have been identified. The cationic bischelate [R 3 NCH 2 CH(O)CH 2 O} 2 B] + dominates the 2:1 ratio solutions, zwitterionic monochelate species, [R 3 NCH 2 CH(O)CH 2 O}B(OH ) 2 ], dominate the 1:1 solutions and the pentaborate anion, [B 5 O 6 (OH) 4 ] − , dominates the 1:5 solutions. Borate solutions
摘要B(OH)3与[R 3 N CH 2 CH(OH)CH 2 OH}] [OH]的相互作用(R 3 = Me 3,Me 2 Et,MeEt 2,Me 2 Bz,Me 2 通过11 B NMR光谱研究了水溶液中1:2、1:1和5:1的CH 2 CH 2 OH})的存在,并确定了存在的平衡物种。阳离子双螯合物[R 3 N CH 2 CH(O)CH 2 O} 2 B] +占2:1比例溶液,两性离子单螯合物,[R 3 N CH 2 CH(O)CH 2 O} B (OH)2]占主导地位的1:1溶液和五硼酸阴离子[B 5 O 6(OH)4]-占主导地位的1:5溶液。还通过11 B NMR研究了衍生自[NMe 4] [OH]和[Me 3 NCH 2 CH 2 OH] [OH]的硼酸盐溶液。这些硼酸盐溶液的光谱与观察到的带有碱金属阳离子的硼酸盐溶液的光谱基本相同,