Unusual ligand coordination for cesium.
Unusual ligand coordination for cesium.
复制标题
铯的异常配体配位。
作者：
J. Bryan;K. Kavallieratos;R. Sachleben
当与四苯并-24冠-8络合时，铯离子可以适应前所未有的结扎。介绍了下列配合物的结构。[Cs(tetrabenzo-24-crown-8)(eta 1- ncme)2(eta 2- ncme)][NO3](1)：三斜P1， a = 12.0119(14) a, b = 13.3680(15) a, c = 13.7859(12) a, alpha = 89.124(8)度，beta = 66.928(9)度，gamma = 71.536（10）度，V = 1916.7(4) A3, Z = 2。][Cs(tetrabenzo-24-crown-8)(eta 1-NCMe)2(eta 2- ch2cl2)][NO3](2)：三斜，P1, a = 12.295(3) a, b = 13.295(3) a, c = 13.782(3) a, alpha = 89.105（17）度，beta = 66.096（18）度，gamma = 71.980（19）度，V = 1929.5(8) A3, Z = 2。这些结构是报道的第一个与金属离子线性配位的例子，也是第一个与碱金属离子和二氯甲烷结合的结构。讨论了这些不寻常的金属-配体相互作用的可能的空间和电子起源。
When complexed by tetrabenzo-24-crown-8, the cesium ion can accommodate unprecedented ligation. The structures of the following complexes are presented. [Cs(tetrabenzo-24-crown-8)(eta 1-NCMe)2(eta 2-NCMe)][NO3] (1): triclinic P1, a = 12.0119(14) A, b = 13.3680(15) A, c = 13.7859(12) A, alpha = 89.124(8) degrees, beta = 66.928(9) degrees, gamma = 71.536(10) degrees, V = 1916.7(4) A3, Z = 2. [Cs(tetrabenzo-24-crown-8)(eta 1-NCMe)2(eta 2-CH2Cl2)][NO3] (2): triclinic, P1, a = 12.295(3) A, b = 13.295(3) A, c = 13.782(3) A, alpha = 89.105(17) degrees, beta = 66.096(18) degrees, gamma = 71.980(19) degrees, V = 1929.5(8) A3, Z = 2. These structures are the first reported examples of linear eta 2-acetonitrile coordination to any metal ion and the first structures illustrating eta 2-acetonitrile and dichloromethane ligation to an alkali metal ion. Possible steric and electronic origins of these unusual metal-ligand interactions are discussed.