摘要

Metal-organic coordination represents a versatile protocol to designed and synthesize 2D organic-based materials. When multiple binding modes are present simultaneously in the metal-organic coordination self-assembly, the outcome becomes less predictable and novel phases may emerge. Here I discuss two examples. The first system is co-existing twofold and threefold pyridyl–Cu coordination modes resulting in a demi-regular lattice which features local dodecagonal symmetry on a Cu(111) surface. This structure is thermodynamically robust and emerges solely when the molecular density is at a critical value. The second system involves Eu-carbonitrile coordination. Depending on ligand/metal stoichiometry, three-fold, four-fold, five-fold and six-fold coordination motifs can be formed on a Au(111) surface, resulting in various structures exhibiting irregular pores, square lattice, five-fold snub-square nodes structures, and hexagonal lattice. At a specific stoichiometry, the prevailing expression of five-fold and six-fold coordination nodes yields quasicrystalline tessellation. I will also discuss our recent efforts of synthesizing p-conjugated metal-organic systems exhibiting non-trivial quantum phases.  

报告人简介

Prof. Lin Nian got his PhD in 1997 from the Hong Kong University of Science and Technology. Then he did his postdoc in Linkoping University, Sweden, for 2 years. After that, he worked as a research group leader in Max-Planck-Institute for Solid State Research in Stuttgart, Germany, for seven years. He is now a full professor in Physics Department of the Hong Kong University of Science and Technology.Prof. Lin is well known for his works on the study of metal-organic coordination on surface. He is the co-authors of 120 papers including 4 nature series, 18 JACS, 5 PRL, with more than 5000 citations and H-index of 40.