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        氢键 hydrogen bonding

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        615
        与负电性大的原子 X（氟、氯、氧、氮等）共价结合的氢，如与负电性大的原子 Y（与 X相同的也可以）接近，在 X与 Y之间以氢为媒介，生成 X-H… Y形的键。这种键称为氢键。氢键的结台能是 2— 8千卡（ Kcal）。因多数氢键的共同作用，所以非常稳定。在 a-螺旋的情况下是 N-H… O型的氢键， DNA的双螺旋情况下是 N-H… O， N-H… N型的氢键，因为这样氢键很多，因此这些结构是稳定的，此外，水和其他溶媒是异质的，也由于在水分子间生成 O-H… O型氢键。因此，这也就成为疏水结合形成的原因。

         

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