Hybrid sp-sp(2) structures can be efficiently obtained on metal substrates via on-surface synthesis. The choice of both the precursor and the substrate impacts on the effectiveness of the process and the stability of the formed structures. Here we demonstrate that using anthracene-based precursor molecules on Au(111) the formation of polymers hosting sp carbon chains is affected by the steric hindrance between aromatic groups. In particular, by scanning tunneling microscopy experiments and density functional theory simulations we show that the de-metalation of organometallic structures induces a lateral separation of adjacent polymers that prevents the formation of ordered domains. This study contributes to the understanding of the mechanisms driving the on-surface synthesis processes, a fundamental step toward the realization of novel carbon-based nanostructures with perspective applications in nanocatalysis, photoconversion, and nano-electronics.

Steric hindrance in the on-surface synthesis of diethynyl-linked anthracene polymers / S. Achilli, F. Tumino, A. Rabia, A. Orbelli Biroli, A. Li Bassi, A. Bossi, N. Manini, G. Onida, G. Fratesi, C.S. Casari. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 24:22(2022 Jun 14), pp. 13616-13624. [10.1039/d2cp00730d]

Steric hindrance in the on-surface synthesis of diethynyl-linked anthracene polymers

S. Achilli
Primo
;
N. Manini;G. Onida;G. Fratesi;
2022

Abstract

Hybrid sp-sp(2) structures can be efficiently obtained on metal substrates via on-surface synthesis. The choice of both the precursor and the substrate impacts on the effectiveness of the process and the stability of the formed structures. Here we demonstrate that using anthracene-based precursor molecules on Au(111) the formation of polymers hosting sp carbon chains is affected by the steric hindrance between aromatic groups. In particular, by scanning tunneling microscopy experiments and density functional theory simulations we show that the de-metalation of organometallic structures induces a lateral separation of adjacent polymers that prevents the formation of ordered domains. This study contributes to the understanding of the mechanisms driving the on-surface synthesis processes, a fundamental step toward the realization of novel carbon-based nanostructures with perspective applications in nanocatalysis, photoconversion, and nano-electronics.
Settore FIS/03 - Fisica della Materia
Settore CHIM/02 - Chimica Fisica
   Understanding and Tuning FRiction through nanOstructure Manipulation (UTFROM)
   UTFROM
   MINISTERO DELL'ISTRUZIONE E DEL MERITO
   20178PZCB5_003
14-giu-2022
17-mag-2022
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/946732
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