Lattice-Directed Selective Synthesis of Acetylenic and Diacetylenic Organometallic Polyynes
Xin Yu, Qiang Sun, Mengxi Liu, Wan Du, Yi Liu, Liangliang Cai, Zeqi Zha, Jinliang Pan, Faming Kang, Wenze Gao, Dandan Yang, Xiaohui Qiu, Wei Xu
Abstract
As a bottom-up strategy, on-surface synthesis shows great potential in constructing novel carbon-based nanostructures. Herein, on-surface reactions of 1,1,2,2-tetraiodoethylene and 1,1,4,4-tetrabromo-1,2,3-butatriene were systematically explored. A combination of scanning tunneling microscopy and noncontact atomic force microscopy demonstrates that it is feasible to achieve acetylenic and diacetylenic organometallic polyyne (i.e., acetylenic Ag–carbyne and diacetylenic Cu–carbyne) on Ag(110) and Cu(110) surfaces, respectively. Interestingly, after annealing the sample, the acetylenic Ag–carbyne was transformed to diacetylenic Ag–carbyne on Ag(110), while an opposite transformation process occurred between diacetylenic and acetylenic Cu–carbyne on Cu(110). The DFT calculations indicate that such a lattice dependence of skeleton reconstruction originates from the thermodynamic stability of diacetylenic Ag–carbyne/acetylenic Cu–carbyne on the corresponding surfaces.