A new pyridine-based 12-membered macrocycle functionalised with different fluorescent subunits; coordination chemistry towards Cu<sup>II</sup>, Zn<sup>II</sup>, Cd<sup>II</sup>, Hg<sup>II</sup>, and Pb<sup>II</sup>
作者:Alexander J. Blake、Andrea Bencini、Claudia Caltagirone、Greta De Filippo、Luisa Stella Dolci、Alessandra Garau、Francesco Isaia、Vito Lippolis、Palma Mariani、Luca Prodi、Marco Montalti、Nelsi Zaccheroni、Claire Wilson
DOI:10.1039/b407037b
日期:——
with those of ligand L2, which contains a N-aminopropyl side arm. The measured values show that Hg(II) in water has the highest affinity for both ligands followed by Cu(II), Cd(II), Pb(II), and Zn(II). For each metal ion considered, 1:1 complexes with L1 have also been isolated in the solid state, those of Cu(II) and Zn(II) having also been characterised by X-ray crystallography. In both complexes L1
新型吡啶基,N2S2供体的12元大环2,8-dithia-5-aza-2,6-pyridinophane(L1)对Cu(II),Zn(II),Cd(II)的配位化学,Hg(II)和Pb(II)均已在水溶液和固态条件下进行了研究。L1的质子化常数和上述金属离子的稳定性常数已通过电位法测定,并与含有N-氨基丙基侧臂的配体L2进行了比较。测量值表明,水中的Hg(II)对两种配体具有最高的亲和力,其次是Cu(II),Cd(II),Pb(II)和Zn(II)。对于所考虑的每种金属离子,还已分离出固态的与L1的1:1配合物,还通过X射线晶体学表征了Cu(II)和Zn(II)的配合物。在两个络合物中,L1都采用折叠构象,并且两个金属中心周围的配位环境非常相似:扭曲的八面体配位球的四个位置被大环配体的供体原子占据,而两个相互的顺式位置未被L1占据容纳单齿NO3-配体。然后将大环L1用不同的荧光亚基官能化。