TY - JOUR
T1 - BN-Patterning of Metallic Substrates through Metal Coordination of Decoupled Borazines
AU - Schwarz, Martin
AU - Garnica, Manuela
AU - Fasano, Francesco
AU - Demitri, Nicola
AU - Bonifazi, Davide
AU - Auwärter, Willi
N1 - Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/7/5
Y1 - 2018/7/5
N2 - We report on the synthesis of pyridine-terminated borazine derivatives, their molecular self-assembly as well as the electronic properties investigated on silver and copper surfaces by means of scanning tunneling microscopy and X-ray photoelectron spectroscopy. The introduction of pyridine functionalities allows us to achieve distinct supramolecular architectures with control of the interdigitation of the molecules by surface templating. On silver surfaces, the borazine derivatives arrange in a dense-packed hexagonal structure through van der Waals and H-bonding interactions, whereas on Cu(111), the molecules undergo metal coordination. The porosity and coordination symmetry of the reticulated structure depends on the stoichiometric ratio between copper adatoms and the borazine ligands, permitting an unusual three-fold coordinated Cu–pyridyl network. Finally, spectroscopy measurements indicate that the borazine core is electronically decoupled from the metallic substrate. We thus demonstrate that BNC-containing molecular units can be integrated into stable metal-coordination architectures on surfaces, opening pathways to patterned, BN-doped sheets with specific functionalities, for example, regarding the adsorption of polar guest gases.
AB - We report on the synthesis of pyridine-terminated borazine derivatives, their molecular self-assembly as well as the electronic properties investigated on silver and copper surfaces by means of scanning tunneling microscopy and X-ray photoelectron spectroscopy. The introduction of pyridine functionalities allows us to achieve distinct supramolecular architectures with control of the interdigitation of the molecules by surface templating. On silver surfaces, the borazine derivatives arrange in a dense-packed hexagonal structure through van der Waals and H-bonding interactions, whereas on Cu(111), the molecules undergo metal coordination. The porosity and coordination symmetry of the reticulated structure depends on the stoichiometric ratio between copper adatoms and the borazine ligands, permitting an unusual three-fold coordinated Cu–pyridyl network. Finally, spectroscopy measurements indicate that the borazine core is electronically decoupled from the metallic substrate. We thus demonstrate that BNC-containing molecular units can be integrated into stable metal-coordination architectures on surfaces, opening pathways to patterned, BN-doped sheets with specific functionalities, for example, regarding the adsorption of polar guest gases.
KW - borazines
KW - coinage metals
KW - scanning tunneling microscopy
KW - self-assembly
KW - surface chemistry
UR - http://www.scopus.com/inward/record.url?scp=85049555494&partnerID=8YFLogxK
U2 - 10.1002/chem.201800849
DO - 10.1002/chem.201800849
M3 - Article
C2 - 29701892
AN - SCOPUS:85049555494
SN - 0947-6539
VL - 24
SP - 9565
EP - 9571
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 38
ER -