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Magnetic response of chlorophyll self-assembly within hydrogel: a mechanistic approach towards enhanced photoharvesting

机译：水凝胶中叶绿素自组装的磁响应：一种提高摄影的机械方法

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摘要

Self-assembly of chlorophyll-a (Chl-a) molecules within a protein environment serves as the key factor behind controlled and efficient light energy harvesting in natural photosystems. Long-range ordering among supramolecular structures in terms of spin-orbit coupling and edge effect helps in untrapping of excitons in the disordered energy landscape. Mimicking the photosynthetic machinery would give a new paradigm for organic photovoltaic material design where a large amount of disorder exists. In this paper, we report the experimental evidence of room temperature magnetic domain wall formation and edge effect along with spin flop canting in self-assembled Chl-a within hydrogel matrix via SQUID magnetometry. This was further correlated with intermolecular coupling and exciton delocalization through specific arrangements of self-assembly as evident from NMR spectral and photophysical characteristics. The data cumulatively suggest electronic backscattering protection which is also substantiated by the ferroelectric behavior coming from coexisting symmetry lowering. Here the polarization evolves through primary distribution of pi electronic density along with a photoresponsive IV loop, similar to the photoprotection of photosynthesis. This work thus proposes a promising design principle for room temperature Chl-a based biomimetic systems efficient in photoharnessing.
机译：蛋白质环境中的叶绿素-A（CHL-A）分子的自组装用作自然光系统中控制和有效光能收获背后的关键因素。在旋转轨道耦合和边缘效应方面，超分子结构之间的远程排序有助于在无序的能量景观中解除激子。模仿光合机械将为有机光伏材料设计提供新的范例，其中存在大量病症。在本文中，我们报道了室温磁畴壁形成和边缘效应的实验证据以及在水凝胶基质中通过鱿鱼磁体进行自组装的CHL-A中的旋转浮动。这与通过从NMR光谱和光学特征的明显的自组装的特定布置与分子间偶联和激子脱锁者进一步相关。数据累积地提出了电子反散射保护，该保护也由来自共存对称降低的铁电行为证实。这里，极化通过PI电子密度的主要分布以及光反应性IV环的主要分布而发展，类似于光合作用的光保护。因此，这项工作提出了一个有前途的室温CHL-A基础仿生体系的设计原理，其高效的光学凋亡。

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  • 来源
    《RSC Advances》 |2018年第47期|共8页
  • 作者

    Mandal Pubali; Manna Jhimli S.; Das Debmallya; Maiti Ramaprasad; Mitra Manoj K.; Chakravorty Dipankar;

  • 作者单位

    Jadavpur Univ Sch Mat Sci &

    Nanotechnol Kolkata 700032 India;

    Jadavpur Univ Sch Mat Sci &

    Nanotechnol Kolkata 700032 India;

    Indian Assoc Cultivat Sci Dept Mat Sci Kolkata 700032 India;

    Indian Assoc Cultivat Sci Dept Mat Sci Kolkata 700032 India;

    Jadavpur Univ Sch Mat Sci &

    Nanotechnol Kolkata 700032 India;

    Indian Assoc Cultivat Sci Jadavpur MLS Prof Unit Kolkata 700032 India;

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  • 正文语种 eng
  • 中图分类 化学;
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