Ordered Arrays of Organometallic Iridium Complexes with Long Alkyl Chains on Graphite
作者:Joe Otsuki、Tsubasa Tokimoto、Yuki Noda、Tomohiro Yano、Takeshi Hasegawa、Xiaoming Chen、Yoshio Okamoto
DOI:10.1002/chem.200600972
日期:2007.3.5
Iridium(III) fac-tris(2-phenylpyridine) fac-[Ir(ppy)3] complexes equipped with long alkyl chains were prepared to examine their capability to form organized arrays on the surface of highly oriented pyrolytic graphite (HOPG). The molecules form lamellar arrays at the 1-phenyloctane/HOPG interface. From the analysis of the STM images, it was concluded that the molecules align with alkyl chains being
制备配备长烷基链的铱(III)fac-三(2-苯基吡啶)fac- [Ir(ppy)3]络合物,以检查其在高度取向的热解石墨(HOPG)表面上形成有序阵列的能力。分子在1-苯基辛烷/ HOPG界面形成层状阵列。通过对STM图像的分析,可以得出结论,分子与被叉指的烷基链对齐。在滴入甲苯溶液后,在空气/ HOPG界面处也获得了类似的层状阵列。在分子水平上的层状结构导致长为几百纳米长的矩形二维晶域(纳米晶)。红外外反射光谱表明,吸附的烷基链在纳米级滑片中采用反之字形构象,尽管烷基的Z字形平面的方向是混合的。循环伏安法表明吸附的分子与底物之间的快速电子转移以及明显的分子间电子相互作用。已经发现,高温退火是制备大于几微米规模(微片)的有序组件的有效方法。由外消旋混合物制备的纳米级玻片的取向表现出明显的12倍对称性,而其旋光对映异构体则形成了具有6倍对称性的更多不规则结构域,这表明手性在分子水平和分子堆