Red-NIR luminescence of Mo6 monolayered assembly directly anchored on Au(001)

A tailored near infrared luminescent Mo6 octahedral cluster bearing thiocyanate (NCS) terminal ligands, [Mo6Br8i(NCS)6a]2−, has been synthesized to anchor onto a gold substrate. After immobilization, [Mo6Br8i(NCS)6a]2− building blocks form a self-assembled monolayer on the Au(001) surface as shown b...

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Bibliographic Details
Published inMaterials horizons Vol. 6; no. 9; pp. 1828 - 1833
Main Authors Kepenekian, Mikaël, Molard, Yann, Costuas, Karine, Lemoine, Pierric, Gautier, Régis, Girard, Soraya Ababou, Fabre, Bruno, Turban, Pascal, Cordier, Stéphane
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2019
Subjects
Anchors
Atomic force microscopy
Clusters
Crystallography
Density functional theory
Gold
Grafting
Metal surfaces
Microscopy
Optical properties
Photoelectrons
Photoluminescence
Self-assembled monolayers
Self-assembly
Substrates
Thiocyanates
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Summary:A tailored near infrared luminescent Mo6 octahedral cluster bearing thiocyanate (NCS) terminal ligands, [Mo6Br8i(NCS)6a]2−, has been synthesized to anchor onto a gold substrate. After immobilization, [Mo6Br8i(NCS)6a]2− building blocks form a self-assembled monolayer on the Au(001) surface as shown by scanning tunneling microscopy, atomic force microscopy and X-ray photoelectron spectroscopy. Strikingly, the photoluminescence of [Mo6Br8i(NCS)6a]2− observed in the powder precursor remains after grafting on Au(001). No quenching effect was observed despite the vicinity of the flat metal surface unlike most of the molecular luminophors. Periodic and molecular computational investigations based on density functional theory show that optical properties originate from the Mo6Br8i core and are protected by the NCS outer sphere, despite the shortness of the anchors.
ISSN:2051-6347
2051-6355
DOI:10.1039/c9mh00724e