二氧化氮分子中的离域π键是π_4~3而不是π_3~3

THE DELOCALIZED π BOND IN THE NITROGEN DIOXIDE MOLECULE IS π_3~4 INSTEAD OF π_3~3

本文根据实验事实,用杂化轨道理论定性地讨论了二氧化氮分子的结构,认为此分子的中心原子 N 采取 sp^2杂化,其中一个杂化轨道上填有氮的一个单电子而不是孤对电子,从而指出此分子中的离域π键是π_3~4而不是π_3~3。本文还根据新提出的成键模型很好地解释了二氧化碳分子 NO_2在得失一个电子而成为亚硝酸根离子 NO_2^-和硝基离子 NO_2^+时的键角和键长的变化。

In this paper,the author discusses qualitatively the structure of the nitrogen dioxide molecule in accordance to the experimental facts and to use the theory of hybrid orbital,considers that the centre- atom N in this molecule take sp^2 hybridization and fill a single electron and to ben't a lone pair elec- trons of the nitrogen on the one of these hybrid orbital,thus,points out that the delocalized n bond in the nitrogen dioxide molecule are π_3~4 and aren't π_3~3.The changes of bond angle and bond length when a nitrogen dioxide molecule NO_2 to obtin a electron or to loss a electron to becomes a nitrite ion NO_2^- or a nitryl ion NO_2^+ separately is explained well by the auther on the basis of the new bonding model