Helical Molecular Duplex Strands: Multiple Hydrogen-Bond-Mediated Assembly of Self-Complementary Oligomeric Hydrazide Derivatives
作者:Yong Yang、Zhi-Yong Yang、Yuan-Ping Yi、Jun-Feng Xiang、Chuan-Feng Chen、Li-Jun Wan、Zhi-Gang Shuai
DOI:10.1021/jo070525a
日期:2007.6.1
X-ray structure of a ditopic hydrazide derivative 7 led to the concept that with malonyl groups as interhydrazide linkers hydrogen-bonding-mediated molecular duplex strands might be obtained. Complexation studies between 7, 8, and 9 confirmed this hypothesis. Two quadruple hydrogen-bonded heterodimers formed, in which spectator repulsive secondary electrostatic interaction was found to play an important
仔细检查对位酰肼衍生物7的X射线结构,得出了这样一个概念,即丙二酰基作为酰肼间连接基,可以得到氢键介导的分子双链。的络合作用研究7,8和9证实了这一假设。形成了两个四氢键合的异二聚体,其中观众排斥性的次级静电相互作用被发现在确定配合物的稳定性中起重要作用。在大量的研究1 - 4指出氢键模式可以在更长的低聚酰肼衍生物中持续存在,其链从单体延伸到四聚体。通过两个到十四个链间氢键获得分子双链体。除了影响双链的稳定性外,旁观者的排斥性二次静电相互作用在确定双链的动态行为方面也起着重要作用,如可变温度1 H NMR实验所示。红外研究证实,较长的低聚物中的氢键较强。1 − 4的装配STM技术也研究了HOPG的性能。分子力学计算进一步揭示了较长寡聚物的双螺旋结构。结果为开发具有明确结构的聚合物螺旋双链体提供了新的机会。