Alkyl Chain Length Dependence of the Self-Organized Structure of Alkyl-Substituted Phthalocyanines

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• 作者：Koji Miyake ; Yukari Hori ; Taichi Ikeda ; Masumi Asakawa ; Toshimi Shimizu ; Shinya Sasaki
• 刊名：Langmuir
• 出版年：2008
• 出版时间：May 6, 2008
• 年：2008
• 卷：24
• 期：9
• 页码：4708 - 4714
• 全文大小：847K
• 年卷期：v.24,no.9(May 6, 2008)
• ISSN：1520-5827

文摘

The alkyl chain length on alkyl-substituted phthalocyanines (C_nOPc) dependence of their self-organized structureswas examined in this study. STM results indicated that the symmetry of ordered structures decreased as the alkyl chainbecame longer, with the exception of C₆OPc, which preferentially formed a quasi-3-fold symmetrical structure. Thiscould be explained by the fact that the C_nOPc molecules are most likely to form densely packed structures. With C_nOPc,when n = 4 to 10, the self-organized structures were dependent on the competition between how densely the moleculeswere arranged and how loose the intermolecular interaction energy was, caused by the formation of the densely packedstructure. However, with C_nOPc, when n = 10-18, the molecules tended to form densely packed structures by reducingthe symmetry, even though the C_nOPc molecules were distorted. When C₁₂OPc and cobalt phthalocyanine werecoadsorbed, the mixed system exhibited a four-fold symmetrical structure, which is rarely observed in C₁₂OPc.