A series of expanded porphyrins, incorporating biimidazoles and bipyrroles within their macrocyclic framework, has been synthesized. Insights into the complex conformational characteristics of these ems were obtained from two-dimensional NMR spectroscopic studies. The relative energy values for the various asymmetric structures inferred from these analyses were compared using DFT molecular modeling calculations.Key words: macrocycles, expanded porphyrins, imidazoles, pyrroles, biimidazoles, supramolecular chemistry, heterocycles.
我们合成了一系列扩展卟啉,在其大环框架中包含了双咪唑和双吡咯。二维核磁共振光谱研究揭示了这些 ems 的复杂构象特征。利用 DFT 分子建模计算比较了从这些分析中推断出的各种不对称结构的相对能量值。