AbstractFluorene‐based tripyrrane has been used as a fused precursor to synthesize three novel examples of nonaromatic meso‐fused thia and selenabenzihomoporphyrin(2.1.1.1)s by condensing it with appropriate 2,5‐bis(hydroxymethyl)aryl thiophene or selenophene under acid catalyzed conditions. The meso‐fused heterobenzihomoporphyrins contain one fluorene unit, two pyrrole rings and one thiophene/selenophene ring connected via five meso‐carbons in the macrocyclic framework. The macrocycles were thoroughly characterized by HR‐MS, 1D and 2D NMR, absorption, cyclic voltammetry and DFT/TD‐DFT studies. NMR, absorption, and DFT studies indicated the nonaromatic nature of meso‐fused heterobenzihomoporphyrins. The macrocycles displayed one intense band at ∼380 nm along with a shoulder band at 450 nm and a broad band in the region of 590–850 nm which were bathochromically shifted in the monoprotonated derivatives and absorbed prominently in the NIR region with the peak maxima at ∼1035 nm. The electrochemical studies revealed that the macrocycles showed three well‐defined oxidations and reductions, and TD‐DFT studies corroborated experimental observations.
摘要以芴基三吡喃为融合前体,在酸催化条件下,通过与适当的 2,5-双(羟甲基)芳基噻吩或硒吩缩合,合成了三种新型非芳香族中融合噻吩和硒苯并二氢吡喃卟啉(2.1.1.1)。中融合杂苯并双卟啉包含一个芴单元、两个吡咯环和一个噻吩/硒吩环,通过大环框架中的五个中碳连接。通过 HR-MS、一维和二维核磁共振、吸收、循环伏安法和 DFT/TD-DFT 研究,对这些大环进行了全面的表征。核磁共振、吸收和 DFT 研究表明,中融合杂二苯并二氢卟啉具有非芳香族性质。大环化合物在 380 纳米波长处显示出一个强波段,在 450 纳米波长处有一个肩带,在 590-850 纳米波长处有一个宽波段,这些波段在单质子化衍生物中发生了浴色偏移,在近红外波段吸收显著,最大峰值在 1035 纳米波长处。电化学研究表明,大环表现出三种明确的氧化和还原反应,TD-DFT 研究证实了实验观察结果。