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Machaín, P; Fuhr, J. D; Schneider, S; Carlotto, S; Casarin, M; Cossaro, A; Verdini, A; Floreano, L; Lingenfelder, M; Gayone, J. E; Ascolani, H
Journal of physical chemistry. C, 09/2020, Letnik: 124, Številka: 35Journal Article
Surface alloying of Cu(001) by Sn deposition is a finely controllable method of tuning the degree of copper reactivity in order to drive the on-surface assembly and synthesis of metal–organic coordination networks. In this work we show that the ( 3 2 × 2 ) R 45 ° reconstruction of the Sn/Cu(001) surface alloy acts as a weakly interacting substrate ideal for the assembly of rectangular metal–organic networks based on transition metals. As a demonstration, we have grown a two-dimensional coordination network formed by manganese and TCNQ (7,7,8,8-tetracyanoquinodimethane) with 1:1 stoichiometry. In contrast with the same structure grown on Au(111), the use of the Sn/Cu(001) substrate enables a commensurate structure with larger and more regular ordered domains. We show that the formation of a Cu–TCNQ coordination network and subsequent Mn–Cu transmetalation reactions are the key steps of the growth mechanism. Moreover, ab initio density-functional calculations indicate that the system studied in the present work is a unique example of a metal–organic coordination network weakly interacting with the substrate.
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