Li Jun, Solianyk Leonid, Schmidt Nico, Baker Brian, Gottardi Stefano, Moreno Lopez Juan Carlos, Enache Mihaela, Monjas Leticia, van der Vlag Ramon, Havenith Remco W A, Hirsch Anna K H, Stöhr Meike
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria.
J Phys Chem C Nanomater Interfaces. 2019 May 23;123(20):12730-12735. doi: 10.1021/acs.jpcc.9b00326. Epub 2019 Apr 30.
We report the formation of one- and two-dimensional metal-organic coordination structures from -hexaphenyl-dicarbonitrile (NC-Ph-CN) molecules and Cu atoms on graphene epitaxially grown on Ir(111). By varying the stoichiometry between the NC-Ph-CN molecules and Cu atoms, the dimensionality of the metal-organic coordination structures could be tuned: for a 3:2 ratio, a two-dimensional hexagonal porous network based on threefold Cu coordination was observed, while for a 1:1 ratio, one-dimensional chains based on twofold Cu coordination were formed. The formation of metal-ligand bonds was supported by imaging the Cu atoms within the metal-organic coordination structures with scanning tunneling microscopy. Scanning tunneling spectroscopy measurements demonstrated that the electronic properties of NC-Ph-CN molecules and Cu atoms were different between the two-dimensional porous network and one-dimensional molecular chains.
我们报道了在Ir(111)上外延生长的石墨烯上，由-六苯基二腈（NC-Ph-CN）分子和Cu原子形成的一维和二维金属有机配位结构。通过改变NC-Ph-CN分子与Cu原子之间的化学计量比，可以调节金属有机配位结构的维度：对于3:2的比例，观察到基于三重Cu配位的二维六边形多孔网络，而对于1:1的比例，则形成基于双重Cu配位的一维链。通过扫描隧道显微镜对金属有机配位结构中的Cu原子进行成像，证实了金属-配体键的形成。扫描隧道光谱测量表明，二维多孔网络和一维分子链中NC-Ph-CN分子和Cu原子的电子性质不同。
