Shaping and enforcing coordination spheres: probing the ability of tripodal ligands to favour trigonal prismatic geometry
作者:James C. Knight、Angelo J. Amoroso、Peter G. Edwards、Neha Singh、Benjamin D. Ward
DOI:10.1039/c6dt01165a
日期:——
tripodal frameworks, mono(2,2′-bipyrid-6-yl)bis(2-pyridyl)methanol (L1) and bis(2,2′-bipyrid-6-yl)mono(2-pyridyl)methanol (L2) which have one and two bipyridyl arms, respectively. Both ligands form complexes with the first row transition metals. Both ligands appear to overcome the steric strain involved in twisting the ligand to produce an octahedral complex and the solid state structures in general show
我们报告了两个三脚架框架,单(2,2'-联吡啶-6-基)双(2-吡啶基)甲醇(L 1)和双(2,2'-联吡啶-6-基)单(2-吡啶基)分别具有一个和两个联吡啶基臂的甲醇(L 2)。两种配体均与第一排过渡金属形成配合物。两种配体似乎都克服了扭曲配体以产生八面体络合物的空间应变,并且与相关配体三(2,2'-联吡啶-6-基)甲醇的络合物相比,固态结构通常显示出更多的八面体特征(L 3)。基于晶体学数据的连续形状映射(CShM)计算表明,L 1即使在与没有立体化学偏爱的金属(例如镉)配位时(S(TP)= 7.15和S(Oh)= 3.95),也无法在固态条件下实现三棱柱(TP)配位几何形状。然而,配体L 2清楚地保持了增强三棱柱形构象的能力,这在Mn II和Cd II配合物的晶体结构中得到了证明(分别为S(TP)= 0.75和1.09)。而大号3保持在金属离子存在近TP配置具有较强的八面体的偏好,大