Van Der Waals heterogeneous layer-layer carbon nanostructures involving π···H-C-C-H···π···H-C-C-H stacking based on graphene and graphane sheets.
Noncovalent interactions involving aromatic rings, such as π···π stacking, CH···π are very essential for supramolecular carbon nanostructures. Graphite is a typical homogenous carbon matter based on π···π stacking of graphene sheets. Even in systems not involving aromatic groups, the stability of diamondoid dimer and layer-layer graphane dimer originates from C - H···H - C noncovalent interaction. In this article, the structures and properties of novel heterogeneous layer-layer carbon-nanostructures involving π···H-C-C-H···π···H-C-C-H stacking based on [n]-graphane and [n]-graphene and their derivatives are theoretically investigated for n = 16-54 using dispersion corrected density functional theory B3LYP-D3 method. Energy decomposition analysis shows that dispersion interaction is the most important for the stabilization of both double- and multi-layer-layer [n]-graphane@graphene. Binding energy between graphane and graphene sheets shows that there is a distinct additive nature of CH···π interaction. For comparison and simplicity, the concept of H-H bond energy equivalent number of carbon atoms (noted as NHEQ), is used to describe the strength of these noncovalent interactions. The NHEQ of the graphene dimers, graphane dimers, and double-layered graphane@graphene are 103, 143, and 110, indicating that the strength of C-H···π interaction is close to that of π···π and much stronger than that of C-H···H-C in large size systems. Additionally, frontier molecular orbital, electron density difference and visualized noncovalent interaction regions are discussed for deeply understanding the nature of the C-H···π stacking interaction in construction of heterogeneous layer-layer graphane@graphene structures. We hope that the present study would be helpful for creations of new functional supramolecular materials based on graphane and graphene carbon nano-structures. © 2017 Wiley Periodicals, Inc.
Institute for Chemical Physics & Department of Chemistry, School of Science, State Key Laboratory of Electrical Insulation and Power Equipment, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.|College of Chemical engineering & Technology, Department of Chemistry, Tianshui Normal University, Tianshui, 741001, China.|Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto, 606-8103, Japan.
Kun
K
Yuan
Institute for Chemical Physics & Department of Chemistry, School of Science, State Key Laboratory of Electrical Insulation and Power Equipment, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Rui-Sheng
RS
Zhao
Institute for Chemical Physics & Department of Chemistry, School of Science, State Key Laboratory of Electrical Insulation and Power Equipment, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.|Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto, 606-8103, Japan.
Jia-Jia
JJ
Zheng
Institute for Chemical Physics & Department of Chemistry, School of Science, State Key Laboratory of Electrical Insulation and Power Equipment, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.|Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto, 606-8103, Japan.
Hong
H
Zheng
Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto, 606-8103, Japan.
Shigeru
S
Nagase
Institute for Chemical Physics & Department of Chemistry, School of Science, State Key Laboratory of Electrical Insulation and Power Equipment, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Sheng-Dun
SD
Zhao
College of Chemical engineering & Technology, Department of Chemistry, Tianshui Normal University, Tianshui, 741001, China.
Yan-Zhi
YZ
Liu
Institute for Chemical Physics & Department of Chemistry, School of Science, State Key Laboratory of Electrical Insulation and Power Equipment, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Xiang
0000-0003-3982-4763
X
Zhao
C-H···π stacking interaction; graphane sheet; group additivity; heterogeneous layer-layer structure; theoretical calculation