氢原子与电负性大的原子X以共价键结合,若与电负性大、半径小的原子Y(O F N等)接近,在X与Y之间以氢为媒介,生成X-H…Y形式的一种特殊的分子间或分子内相互作用,称为氢键。[X与Y可以是同一种类分子,如水分子之间的氢键;也可以是不同种类分子,如一水合氨分子(NH3·H2O)之间的氢键]。
Each parts comprised of the compound are helded together by hydrogen bonding and formed the network supramolecular structure.
晶体的各部分间以氢键相互连接, 形成了超分子结构。
参考来源 - 以(NEt4)When 4-or 5-or 7-is subtrituted by OH, there may be intermolecular resonance hydrogen bonds (RAHB) in the coumarins.
4)4位,5位或7位有-OH时,香豆素类化合物可能会存在分子间共振氢键。
参考来源 - 香豆素类化合物的合成与晶体化学研究. The observed weaker CH…O H-bond results in a blue shift in the CH stretching frequency.
相对较弱的CH…O氢键在该体系中频繁出现,并且其CH键的伸缩频率呈现蓝移现象。
参考来源 - 氨基酸分子与溶剂间相互作用的理论研究·2,447,543篇论文数据,部分数据来源于NoteExpress
稳定胶原螺旋的氢键也必须要被破坏。
The hydrogen bonds which stabilize the collagen helix must also be broken.
“氢键”这个名字使用不当,因为它不是真正的键,而是特别强的极性分子间的吸引力。
The name "hydrogen bond" is something of a misnomer, as it is not a true bond but a particularly strong dipole-dipole attraction.
那么现在这些仍然通过氢键连接。
So notice a difference in these structures, is this has an n h bond whereas this has an o h bond.
注意它们之间的有一点不同,那就是一个有氮氢键,而另一个有氧氢键。
There's not actually chemical covalent bonds that are formed but it's a non-covalent interaction, usually dominated by hydrogen bonding.
所以配体和受体之间不生成共价键,这是一种非共价化合反应,它们通常以氢键相联
Now if you read in the book, you read about where this figure is shown in the book, you can understand more about why these structures line up in the right way so that the right molecular elements are together to form hydrogen bonding pairs between them.
如果你预习过课本,课本中有关于这些详细的描述,你可以更深刻的理解,为什么这些结构是采用这种连接方式,以使对应的分子部分靠近,并形成氢键连接
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