论文部分内容阅读
最近,Sussex大学的化学家已把钇、钆和钐等稀土金属原子夹在两个碳原子环之间制成夹心结构的化合物.根据现已承认的化学键规则,这种化合物是不可能制成的.因此这种化合物的制成已向通常的化学键理论提出挑战,并致使化学家去重新考虑稀土元素形成键的方法. 1952年制成第一个夹心化合物二茂络铁,它由两个五角碳环之间夹一个铁原子构成.铁原子利用其一个内层电子与碳环键合,这个内层电子比较靠近铁的外层电子,因此可被吸引供作外加键电子.稀土元素能与碳环键合的外层电子太少,而内层电子得太深,不能参与键合,因此,理论上它们不能形成夹心结构分子.现在该大学的化学家利用稀十元素制成夹心化合物证明理论上可能有错误.他
More recently, chemists at Sussex University have made sandwich-structured compounds by sandwiching rare earth metal atoms such as yttrium, gadolinium, and samarium between two carbon rings, which compounds are not likely to be made according to the chemical bond rules that have been recognized .This compound has therefore been made to the usual chemical bond theory to challenge and lead chemists to reconsider the formation of rare earth element bond method .1952 made of the first sandwich compound ferromycosin, which consists of two The pentagonal carbon ring is made up of an iron atom, and the iron atom is bonded to the carbocyclic ring by one of its inner electrons, which is closer to the outer electrons of the iron and can therefore be attracted for external bonding. There are too few outer electrons bound to a carbocyclic ring, and the inner electrons are so deep that they can not participate in the bonding, so theoretically they can not form a sandwich structure molecule. Now chemists at the university use dilute ten elements to make a sandwich compound Proof may be wrong in theory