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Triisopropylsilylethynyl‐Functionalized Graphene‐Like Fragment Semiconductors: Synthesis, Crystal Packing, and Density Functional Theory Calculations
Author(s) -
Zhang Lei,
Fonari Alexandr,
Zhang Yue,
Zhao Guangyao,
Coropceanu Veaceslav,
Hu Wenping,
Parkin Sean,
Brédas JeanLuc,
Briseno Alejandro L.
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201303308
Subject(s) - stacking , zigzag , density functional theory , crystal (programming language) , molecule , graphene , materials science , chemical physics , semiconductor , organic semiconductor , crystal structure , crystallography , computational chemistry , nanotechnology , chemistry , geometry , optoelectronics , organic chemistry , mathematics , programming language , computer science
Tri‐isopropylsilylethynyl (TIPS)‐functionalized polycyclic aromatic hydrocarbon (PAH) molecules incorporate structural components of graphene nanoribbons and represent a family of model molecules that form organic crystal semiconductors for electronic devices. Here, we report a series of TIPS‐functionalized PAHs and discuss their electronic properties and crystal packing features. We observe that these soluble compounds easily form one‐dimensional (1 D) packing arrangements and allow a direct evolution of the π stacking by varying the geometric shape. We find that the aspect ratio between length and width plays an important role on crystal packing. Our result indicates that when the PAH molecules have zigzag edges, these can provide enough volume for the molecules to rotate and reorient, alleviating the unfavorable electrostatic interactions found in perfectly cofacial π–π stacking. Density functional theory calculations were carried out to provide insights into how the molecular geometric shape influences the electronic structure and transport properties. The calculations indicate that, among the compounds studied here, “brick‐layer” stacks provide the highest hole mobility.