Tunable physics through coordination chemistry: formation on oxide surface of Ti and Al chelates with 3-hydroxyflavone capable of electron injection and light emission

Getachew Solomon; Anton Landström; Silvia Rotta Loria; Eleonora Bolli; Alberto Mezzetti; Anna Facibeni; Sandro Cattarin; Alessio Mezzi; Stefano Protti; Saulius Kaciulis; Margherita Zavelani-Rossi; Isabella Concina

doi:10.1039/D2DT02195A

Tunable physics through coordination chemistry: formation on oxide surface of Ti and Al chelates with 3-hydroxyflavone capable of electron injection and light emission†

Getachew Solomon,

^a Anton Landström,^a Silvia Rotta Loria,^b Eleonora Bolli,^e Alberto Mezzetti,^f Anna Facibeni,

^cd Sandro Cattarin,

^g Alessio Mezzi,^e Stefano Protti,

^h Saulius Kaciulis,

^e Margherita Zavelani-Rossi

^cd and Isabella Concina

*^a

Author affiliations

* Corresponding authors

^a Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
E-mail: isabella.concina@ltu.se

^b Dipartimento di Fisica, Politecnico di Milano, piazza L. da Vinci 32, 20133 Milano, Italy

^c Dipartimento di Energia, Politecnico di Milano, via G. Ponzio 34/3, 20133 Milano, Italy

^d IFN-CNR, piazza L. da Vinci 32, 20133 Milano, Italy

^e Institute for the Study of Nanostructured Materials, ISMN-CNR, 00015 Monterotondo Stazione, Roma, Italy

^f Laboratoire de Réactivité de Surface (LRS), Sorbonne Université, CNRS, 4 Place Jussieu, Paris 75005, France

^g Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia, ICMATE-CNR, C.so Stati Uniti 4, Padova, Italy

^h Photogreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy

Abstract

The optoelectronic features of 3-hydroxyflavone (3HF) self-assembled on the surface of an n-type semiconducting metal oxide (TiO₂) and an insulator (Al₂O₃) are herein investigated. 3HF molecules use the coordinatively unsaturated metal ions present on the oxide surface to form metal complexes, which exhibit different behaviors upon light irradiation, depending on the nature of the metal ion. Specifically, we show that the photoluminescence of the surface species can be modulated according to the chemical properties of the complex (i.e. the binding metal ion), resulting in solid-state emitters in a high quantum yield (about 15%). Furthermore, photoinduced charge injection can be promoted or inhibited, providing a multifunctional hybrid system.

Dalton Transactions

Tunable physics through coordination chemistry: formation on oxide surface of Ti and Al chelates with 3-hydroxyflavone capable of electron injection and light emission†

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Tunable physics through coordination chemistry: formation on oxide surface of Ti and Al chelates with 3-hydroxyflavone capable of electron injection and light emission

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