Synthesis of N-methyl alkylaminomethane-1,1-diphosphonic acids and evaluation of their complex-formation abilities towards copper(II)
作者:Barbara Kurzak、Waldemar Goldeman、Magdalena Szpak、Ewa Matczak-Jon、Anna Kamecka
DOI:10.1016/j.poly.2014.09.031
日期:2015.1
can be attributed to the steric effect imposed by cycloheptyl ring attached directly to the N atom. In addition to the main [Cu(HL) 2 ] complexes, with well-known O, O} chelating binding mode, [Cu(HL)L] and [CuL 2 ] species with the O, N} donor set, protonated dinuclear [Cu 2 H x L 3 ] ( x = 4, 5, 6) species have been detected in all studied systems. The nitrogen coordination in the [Cu(HL)L] and
摘要在反应中合成了一系列具有共同叔氮原子(CH 3 –NR)的带有直链或支链烷基,环庚基或苯基烷基R取代基的N-甲基烷基氨基甲烷-1,1-二膦酸(3a-g)用原甲酸三乙酯和仲胺合成二乙基膦酸酯,然后水解,然后用甲酸和甲醛对烷基氨基甲烷-1,1-二膦酸进行Eschweiler-Clarke甲基化反应。通过pH电位法,ESI-MS光谱法,UV-Vis和EPR方法研究了3a-g对溶液中铜(II)的络合物形成能力。对3a-g的Cu(II)配合物的稳定常数的评估表明,它们依赖于R取代基施加的空间效应和电子效应的组合。已经证明,在N原子(3a,3d,3e)上具有直链或支链烷基的化合物与Cu(II)形成最稳定的配合物,最不稳定的是3f的配合物,这可以归因于所施加的空间效应通过直接与N原子连接的环庚基环 除了主要的[Cu(HL)2]配合物外,还有众所周知的O,O}螯合结合模式,具有[O,N}供体的[Cu(HL)L]和[CuL