Synthesis, Crystal Structures, and Solution Properties ofN-Methylene(phenyl)phosphinic Acid Derivatives of Cyclen and Cyclam
作者:Jan Rohovec、Mojmír Kývala、Pavel Vojtíšek、Petr Hermann、Ivan Lukeš
DOI:10.1002/(sici)1099-0682(200001)2000:1<195::aid-ejic195>3.0.co;2-6
日期:2000.1
coordination of the ligand to the metal ions. The solution properties of the synthesised and the crystal structures of H4L and its bis(1adamantylammonium) salt were determined. In both the ligands were also investigated by 31P-NMR spectroscopy. The spectra observed suggest stable (on the NMR time scale) structures, the ring conformation is virtually the same and is stabilised by hydrogen bonds. Protonation
四氮杂的二苯基次膦酸衍生物出奇的高。Zn2+ 和 Cd2+ 与 (L1)4- 和 (L2)4- 的配合物不如与其他类似大环(1,4,7,10-四氮杂环十二烷四基)四(亚甲基)四(苯基次膦酸)的配合物稳定]( H4L) 和配体,这与 H4L 和 H4L 的总体碱度较低是一致的。(1,4,8,11-四氮杂环十四烷四基)四(亚甲基)四(苯基次膦酸)] (H4L) 的稳定性显着下降,是 H4L 的配合物可以通过配体与金属离子的部分配位来解释. 测定了合成物的溶液性质和 H4L 及其双(1 金刚烷基铵)盐的晶体结构。还通过 31 P-NMR 光谱研究了这两种配体。观察到的光谱表明结构稳定(在 NMR 时间尺度上),环构象几乎相同并且由氢键稳定。溶液中质子化配体构象的质子化常数。溶液和 CP/MAS-NMR 酸中 NMR 光谱的比较及其 Zn2+ 和 Cd2+ 复合物的稳定性常数在 25°C 下通过 pH