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Synthesis, optical properties, and electronic structures of fully core-modified porphyrin dications and isophlorins

机译:完全修饰的卟啉类药物和异黄酮的合成,光学性质和电子结构

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摘要

The synthesis, structures, optical properties, and electronic structures of the tetraphenyltetrathiaporphyrin dication (S _4TPP ~(2+), 6) and tetrakis(pentafluorophenyl)tetrathiaisophlorin (S _4F _(20)TPP, 7) are reported. S _4TPP ~(2+) (6) and S _4F _(20)TPP (7) were synthesized by acid-catalyzed condensation of the corresponding hydroxylmethylthiophene, followed by oxidation. The electronic structures of S _4TPP ~(2+) (6) and S _4F _(20)TPP (7) were analyzed by using UV/Vis-absorption spectroscopy and by magnetic /ular dichroism (MCD) spectroscopy and the bands were assigned by using time-dependent density functional theory (TD-DFT) and ZINDO/s calculations. A red-shift of the Q bands of S _4TPP ~(2+) (6) is observed relative to the spectra of tetraphenylporphyrins because a destabilization of the HOMO leads to a narrower HOMO-LUMO band-gap. Michl's perimeter model was used to assign the absorption bands and MCD spectra of S _4F _(20)TPP (7). Current-density maps and nucleus-independent chemical-shift (NICS) calculations of S _4TPP ~(2+) (6) and of a model compound predict marked modification to the diamagnetic ring current, whilst nonaromatic character is predicted for S _4F _(20)TPP (7).
机译:报道了四苯基四硫杂卟啉指示剂(S _4TPP〜(2+),6)和四(五氟苯基)四硫代叶绿素(S _4F _(20)TPP,7)的合成,结构,光学性质和电子结构。 S _4TPP〜(2+)(6)和S _4F _(20)TPP(7)通过酸催化相应的羟甲基噻吩缩合,然后氧化而合成。通过使用UV / Vis吸收光谱和磁/二色性(MCD)光谱分析了S _4TPP〜(2+)(6)和S _4F _(20)TPP(7)的电子结构,并指定了能带通过使用时变密度泛函理论(TD-DFT)和ZINDO / s计算。相对于四苯基卟啉的光谱,观察到S _4TPP〜(2+)(6)的Q带发生红移,因为HOMO的不稳定导致HOMO-LUMO带隙变窄。 Michl的周长模型用于指定S _4F _(20)TPP(7)的吸收带和MCD光谱。 S _4TPP〜(2+)(6)和模型化合物的电流密度图和独立于核的化学位移(NICS)计算预测了反磁环电流的显着变化,而预测了S _4F _(_的非芳族特性) 20)TPP(7)。

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