標題: Alkoxy Chain Number Effect on Self-Assembly of a Trigonal Molecule at the Liquid/Solid Interface
作者: Tahara, Kazukuni
Nakayama, Ruri
Maeda, Matsuhiro
De Feyter, Steven
Tobe, Yoshito
應用化學系
Department of Applied Chemistry
公開日期: 7-Nov-2019
摘要: We herein investigated the effect of the number of alkoxy chains on the two-dimensional self-assembly of a trigonal molecular building block. To this end, a dehydrobenzo[12]-annulene (DBA) derivative, DBA-OC14-OC1 having three tetradecyloxy chains and three methoxy groups in an alternating manner, was synthesized. Scanning tunneling microscopy (STM) observations at the 1,2,4-trichlorobenzene (TCB)/graphite interface revealed that DBA-OC14-OC1 forms three monolayer structures: porous honeycomb, parallelogram, and hexagonal A structures. At the 1-phenyloctane (PO)/graphite interface, DBA-OC14-OC1 also forms three structures: parallelogram, hexagonal B, and dense linear structures. In contrast to the previously reported DBA derivative DBA-OC14 having six tetradecyloxy chains, DBA-OC14-OC1 shows structural polymorphism with a variety of alkyl chain interaction modes. Because in the observed patterns DBA-OC14-OC1 adopts a low symmetric C-s or C-1 geometry, the variation of the interaction modes and the resulting network patterns likely originate from the conformational flexibility on surface of this DBA by decreasing the number of alkyl chains. Molecular mechanics simulations gave insight into the structural and energy aspects of this pattern formation. We also discussed the role of solvents, TCB and PO, on the polymorph formation.
URI: http://dx.doi.org/10.1021/acs.jpcc.9b08084
http://hdl.handle.net/11536/153250
ISSN: 1932-7447
DOI: 10.1021/acs.jpcc.9b08084
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 123
Issue: 44
起始頁: 27020
結束頁: 27029
Appears in Collections:Articles