the bridge. The bridging enforces a cisoid geometry of the ligand and prohibits its replacement by added water. An X-ray determination was carried out for [Eu(3b)3](ClO4)3, where 3b=3,3′; 5,3″-dimethylene tpy, which crystallizes in the monoclinic space group P21/c with a=11.908(4), b=15.768(5), c=29.513(9) A, β=93.60(2)°, μ=13.5 cm−1 and Z=4. The complex forms a tricapped trigonal prism with each of
摘要络合物[Eu(tpy)3](
ClO4)3,其中tpy = 2,2'; 已经制备并重新检查了6,2″-叔
吡啶。相对于
配体的分解,该络合物在
乙腈溶液中似乎是稳定的,但是加
水确实会导致部分取代tpy。用3,3'制备了类似的配合物;tpy的5,3''-聚亚甲基桥连衍
生物,在桥中具有两个或三个碳。桥接增强了
配体的cisoid几何形状,并禁止其被添加的
水取代。对[Eu(3b)3]( )3进行X射线测定,其中3b = 3,3'; 5,3″-二亚甲基tpy,其在单斜空间群P21 / c中结晶,a = 11.908(4),b = 15.768(5),c = 29.513(9)A,β= 93.60(2)°,μ = 13.5 cm-1且Z = 4。该络合物与每个
配体采用相同的dl构象形成三棱柱三角棱镜。桥联
配体配合物的可变温度NMR分析表明,结合的
配体的构象转化不是协调的过程,单个亚甲基单元转化的障碍