Time resolved structural dynamics of butadiyne-linked porphyrin dimers.
Time resolved structural dynamics of butadiyne-linked porphyrin dimers.
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DOI：
10.1063/1.4940222
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
Heisler IA
中科院分区：
文献类型：
--
作者：
Camargo FV;Hall CR;Anderson HL;Meech SR;Heisler IA
在这项工作中，与丁二烯连接的卟啉二聚体的结构动力学的时间尺度和机制进行了研究，通过时间分辨窄带泵浦/宽带探测瞬态吸收光谱。我们的研究结果证实了以前的研究结果，扩大部分是由于不同的（二面角）角构象的结构分布。在Q带的红边和蓝边激发的测量比较解开了基态和激发态构象再平衡的时间尺度。通过添加配体，与平面化二聚体的进一步比较提供了卟啉二聚体在溶液中进行的扭转运动的确凿证据。
In this work, the timescales and mechanisms associated with the structural dynamics of butadiyne-linked porphyrin dimers are investigated through time resolved narrowband pump/broadband probe transient absorption spectroscopy. Our results confirm previous findings that the broadening is partly due to a distribution of structures with different (dihedral) angular conformations. Comparison of measurements with excitations on the red and blue sides of the Q-band unravel the ground and excited state conformational re-equilibration timescales. Further comparison to a planarized dimer, through the addition of a ligand, provides conclusive evidence for the twisting motion performed by the porphyrin dimer in solution.