A new dipyridine-containing cryptand for both proton and Cu(ii) encapsulation. A solution and solid state study
作者:Carla Bazzicalupi、Anna Bellusci、Andrea Bencini、Emanuela Berni、Antonio Bianchi、Samuele Ciattini、Claudia Giorgi、Barbara Valtancoli
DOI:10.1039/b200486k
日期:2002.5.13
nitrogens of L1. Protonation and Cu(II) coordination have been studied in aqueous solution by means of potentiometric and UV-vis spectrophotometric measurements. Considering proton binding, cryptand L behaves as a proton sponge, i.e., the first protonation constant is too high to be measured in aqueous solution. Both ligands form 1 ∶ 1 Cu(II) complexes in aqueous solutions. The crystal structure of [CuL1]2+
新型多胺隐窝分子2,5,8-三氮杂-5-甲基-2,8-(N-甲基二丙基氨基)[9] -2,2'-二吡啶并oph烷(L)及其大环前体2,5,的合成与表征据报道有8-三氮杂-5-甲基[9] -2,2'-二吡啶并oph烷(L1)。配体L1含有连接2,2′-二吡啶部分的6,6′位置的二亚乙基三胺链;L 1和R 2相互连接。在L中,N-甲基二丙胺桥连接L1的两个苄基氮。已经通过电位和紫外可见分光光度法研究了水溶液中的质子化和Cu(II)配位。考虑质子结合,cryptand L质子海绵起质子的作用,即第一质子化常数太高,无法在水溶液中测量。两种配体在水溶液中均形成1:1 Cu(II)配合物。[Cu L1 ] 2+的晶体结构表明,该金属由五个配体供体以严重扭曲的方锥几何形状进行配位。在具有L,[Cu L H] 3+的质子化配合物中发现了几乎相同的配位环境,而N-甲基二丙胺桥的氮被质子化了。与之形成鲜明对比的是[Cu