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冠醚化合物因具有环状空腔结构的特点而有独特的配位性能.随着冠醚环上杂原子的数目、种类不同(如氧、氮、硫、磷)而有不同的配合能力及其配位本质.除此之外,冠醚环上电子密度分布对配位能力具有重要作用;金属离子的电子结构对配位性质也有很大影响.对于不是很大的冠醚环来说,通常只配位碱金属、碱土金属、镧系、锕系元素,而较难配位过渡金属离子.近年来,有人通过在冠醚环上引进吸电子基团,减低环上氧原子的电子给予体性质,以求改变配位性能.我们感兴趣的是在以普通冠醚为配体时,配合物同时包含有碱金属与过渡金属离子的配位情况与结构.作者曾对18-冠-6在有钾离子与钴离子体系中的配位情况与晶体结构作了报道,本文研究了硫氰酸铵及氯化钴与二苯并-18-冠-6反应生成的配合物结构及其特点.
Crown ether compounds have unique coordination properties due to their ring-like cavity structure, with different capacities due to the number and type of heteroatoms (eg, oxygen, nitrogen, sulfur, and phosphorus) Its coordination nature.In addition, the crown ether ring electron density distribution on the coordination ability plays an important role; the electronic structure of metal ions on the coordination properties also have a great impact.For the crown ether ring is not very large, Usually only coordinate alkali metals, alkaline earth metals, lanthanides, actinides, and more difficult to coordinate transition metal ions.In recent years, some people in the crown ether ring through the introduction of electron-withdrawing groups, reducing oxygen atoms on the ring to give In order to change the coordination properties.We are interested in the ordinary crown ether as a ligand, the complex contains both alkali metal and transition metal ion coordination and structure.We have 18-crown- 6 in potassium ion and cobalt ion coordination system and the crystal structure were reported in this paper the ammonium thiocyanate and cobalt chloride and dibenzo-18-crown-6 complex formed by the reaction and its Features.