Ramakrishna Tejaswini R B, Mathesh Motilal, Liu Zhen, Zhang Chunmei, Du Aijun, Liu Jingquan, Barrow Colin J, Chen Min, Biggs Mark J, Yang Wenrong
School of Life and Environmental Science, Deakin University, Geelong, Victoria 3216, Australia.
College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Qingdao University, Qingdao 266071, People's Republic of China.
Langmuir. 2020 Nov 17;36(45):13575-13582. doi: 10.1021/acs.langmuir.0c02370. Epub 2020 Oct 21.
Solvent plays an important role in the surface interaction of molecules. In this study, we use "chlorophyll a", an archetypical molecule, to investigate its supramolecular self-assembly with chemically reduced graphene oxide in three different types of solvents: polar protic, polar aprotic, and non-polar. It was observed that only a polar protic solvent that can donate protons facilitates the hydrogen bonding between chlorophyll a and chemically reduced graphene oxide nanosheets in a hybrid system. The formation of hydrogen bonds further initiates the other non-covalent interactions such as π-π stacking and hydrophobic interaction, which altogether play a key driving force for supramolecular self-assembly of chlorophylls on chemically reduced graphene oxides. The experimental results are strongly supported by density functional theory calculations, which show robust electron coupling between chlorophylls and chemically reduced graphene oxide.
溶剂在分子的表面相互作用中起着重要作用。在本研究中，我们使用“叶绿素a”这一典型分子，来研究其在三种不同类型溶剂（极性质子溶剂、极性非质子溶剂和非极性溶剂）中与化学还原氧化石墨烯的超分子自组装。据观察，只有能够提供质子的极性质子溶剂才能促进混合体系中叶绿素a与化学还原氧化石墨烯纳米片之间的氢键形成。氢键的形成进一步引发了其他非共价相互作用，如π-π堆积和疏水相互作用，这些相互作用共同构成了叶绿素在化学还原氧化石墨烯上超分子自组装的关键驱动力。密度泛函理论计算有力地支持了实验结果，该计算表明叶绿素与化学还原氧化石墨烯之间存在强电子耦合。
