Deposition of Tetracoordinate Co(II) Complex with Chalcone Ligands on Graphene

Deposition of Tetracoordinate Co(II) Complex with Chalcone Ligands on Graphene

WoS Article

Studying the properties of complex molecules on surfaces is still mostly an unexplored research area because the deposition of the metal complexes has many pitfalls. Herein, we probed the possibility to produce surface hybrids by depositing a Co(II)-based complex with chalcone ligands on chemical vapor deposition (CVD)-grown graphene by a wet-chemistry approach and by thermal sublimation under high vacuum(.) Samples were characterized by high-frequency electron spin resonance (HF-ESR), XPS, Raman spectroscopy, atomic force microscopy (AFM), and optical microscopy, supported with density functional theory (DFT) and complete active space self-consistent field (CASSCF)/N-electron valence second-order perturbation theory (NEVPT2) calculations. This compound's rationale is its structure, with several aromatic rings for weak binding and possible favorable pi-pi stacking onto graphene. In contrast to expectations, we observed the formation of nanodroplets on graphene for a drop-cast sample and microcrystallites localized at grain boundaries and defects after thermal sublimation.

Studying the properties of complex molecules on surfaces is still mostly an unexplored research area because the deposition of the metal complexes has many pitfalls. Herein, we probed the possibility to produce surface hybrids by depositing a Co(II)-based complex with chalcone ligands on chemical vapor deposition (CVD)-grown graphene by a wet-chemistry approach and by thermal sublimation under high vacuum(.) Samples were characterized by high-frequency electron spin resonance (HF-ESR), XPS, Raman spectroscopy, atomic force microscopy (AFM), and optical microscopy, supported with density functional theory (DFT) and complete active space self-consistent field (CASSCF)/N-electron valence second-order perturbation theory (NEVPT2) calculations. This compound's rationale is its structure, with several aromatic rings for weak binding and possible favorable pi-pi stacking onto graphene. In contrast to expectations, we observed the formation of nanodroplets on graphene for a drop-cast sample and microcrystallites localized at grain boundaries and defects after thermal sublimation.

graphene; cobalt complexes; hybrid material; magneto-chemistry

graphene; cobalt complexes; hybrid material; magneto-chemistry

HRUBÝ, J.; VAVREČKOVÁ, Š.; MASARYK, L.; SOJKA, A.; NAVARRO GIRALDO, J.; BARTOŠ, M.; HERCHEL, R.; MONCOL, J.; NEMEC, I.; NEUGEBAUER, P.

2021

01.11.2020

MDPI

BASEL

1420-3049

MOLECULES

25

21

Swiss Confederation

5021-1

5021-17

17

https://www.mdpi.com/1420-3049/25/21/5021

http://hdl.handle.net/11012/195847

molecules-25-05021-v2