化学学报 ›› 2001, Vol. 59 ›› Issue (2): 195-200. 上一篇    下一篇

研究论文

四吡啶基卟啉质子化结构变化研究 Ⅱ.m - 甲基吡啶基的取代 基效应

马思渝;王娟   

  1. 北京师范大学化学系.北京(100875)
  • 发布日期:2001-02-15

Studies on the structural change of the N-protonated tetrapyridylporphine Ⅱ. the effects of the substituting group meso- (p-methylpyridyl)

Ma Siyu;Wang Juan   

  1. Beijing Normal Univ., Dept of Chem..Beijing(100875)
  • Published:2001-02-15

卟啉衍生物对嵌入并堆积在DNA螺旋中具有高选择性,为考察m-甲基吡啶取代基对质子化卟啉结构的影响,在m-四吡啶基卟啉研究的基础上,用半经验的AM1MO方法,并进行合理的对称性限制,计算了m-四甲基吡啶卟啉(TmPyPH2^4+)及其质子化二酸(TmPyPH4^6+)的几种可能的构型,结果表明,由于m-甲基吡啶的影响,在质子化过程中结构和键电荷布居有明显变化;前沿分子轨道具有与四吡啶基情形相反的变化趋势,质子化二酸与溶液质子的快速交换作用也变得更困难了。

关键词: 吡啶P, 卟啉, 分子轨道理论, 堆积模型, 分子堆积, 质子化作用, 构型, 取代基效应

Porphyrin derivatives have sensitive selectivity to molecuar intercalation and aggregation in DNA helix. On the basis of the study of tetrapyridylporphine, in order to investigate the effects of meso- (p- methylpyridyl) to the structure of N - protonated porphyring, the geometries of meso - tetrakis (p - methylpyridyl) porphyrin (TmPyPH2^4+) and its diacid (TmPyPH4^6+) were calculated by using AM1 MO method under certain symmetry restriction. The results show that in the protonation process, because of the effect of meso - (p - methylpyridyl), the changes of the structure and bond charge population are obvious; the frontier molecular orbitals have opposite change trend with the case of meso - yridyl, the rapid exchanges of inner hydrogens of the protonated diacid with solvent protons become more difficult.

Key words: PYRIDINE P, PORPHYRIN, MOLECULAR ORBITAL THEORY, CONE PACKING MODEL, PROTONATION, CONFIGURATION, SUBSTITUENT EFFECT

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