AVS 65th International Symposium & Exhibition
    Nanometer-scale Science and Technology Division Tuesday Sessions
       Session NS+AM+MI+MN+SS+TR-TuA

Paper NS+AM+MI+MN+SS+TR-TuA10
Visualizing Coordination Structures of Small Gas Molecules to Metallo-porphyrin on Au(111) Using Scanning Tunneling Microscopy

Tuesday, October 23, 2018, 5:20 pm, Room 102B

Session: SPM – Probing and Manipulating Nanoscale Structures
Presenter: MinHui Chang, Korea University, Republic of Korea
Authors: M.H. Chang, Korea University, Republic of Korea
Y.H. Chang, Korea Advanced Institute of Science and Technology (KAIST)
N.Y. Kim, Korea Advanced Institute of Science and Technology (KAIST)
U.S. Jeon, Korea University, Republic of Korea
H. Kim, Korea University, Republic of Korea
Y.-H. Kim, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
S.-J. Kahng, Korea University, Republic of Korea
Correspondent: Click to Email
Binding reaction between small molecules and metallo-porphyrins play crucial roles in functional processes of biological systems such as oxygen delivery, muscle contraction, and synaptic transmission. Their geometrical structures such as tilted binding of NO to metallo-porphyrin have been recently confirmed by high-resolution scanning tunneling microscopy (STM) images at the single molecule level. Here, we present STM images of further systems, di, tri, and quadra-atomic small molecules, coordinated to metallo-porphyrin on Au(111). We observed square ring, rectangular ring, and center-bright structures for three different small molecules. With the help of density functional theory (DFT) calculations, we reproduce the experimental STM images in the simulated images. Thus, our study shows that geometric structures of small molecules coordinated to metallo-porphyrins can be probed with STM combined with DFT methods.