这几日在南大参加理论与计算化学暑期学校,课上刘春根老师介绍价键理论时,提到了厦门大学的吴玮教授在Shaik门下读书时所发现的Charge-shift bond, 它既不同于一般covalent bond, 也非 ionic bond, 根据维基的介绍 "The charge shift bond derives its stability from the resonance of ionic forms rather than the covalent sharing of electrons which are often depicted as having electron density between the bonded atoms." " A feature of the charge shift bond is that the predicted electron density between the bonded atoms is low. It has long been known from experiment that the accumulation of electronic charge between the bonded atoms is not necessarily a feature of covalent bonds."
一个典型的例子就是, [1.1.1]propellanes ([1,1,1]-螺桨烷),甚至在我们之前认为的典型的共价化合物氟气F2中,也发现含有这种键的成分.当然这一切都是在VB框架下做的工作, 不得不佩服吴玮的坚持, 众所周知VB在今天并不是主流, 但是吴玮能够坚持,我想这是我们应该学习的.
在搜索一番后,发现Shaik和Hiberty所著的 The Chemical Bond Fundamental Aspects of Chemical Bonding 中对此有论述,所以下载下来, 拼接为一本完整的书籍. 本来想做一个完整的目录, 但是做到一半实在是犯懒. 所以目录是个1/10成品,还望见谅.
值得一提的是, The chemical bond 共有两册, 另一册的名叫 The Chemical Bond: Chemical Bonding Across the Periodic Table ,如有同仁能够整理一下上传共享,那是惠泽后代之事.
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