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Investigation of Luminescent Triplet States in Tetranuclear Cu$^{I}$ Complexes: Thermochromism and Structural Characterization

Boden, Pit; Di Martino-Fumo, Patrick; Busch, Jasmin M.; Rehak, Florian R.; Steiger, Sophie; Fuhr, Oliver; Nieger, Martin; Volz, Daniel; Klopper, Willem; Bräse, Stefan; Gerhards, Markus

Abstract:
To develop new and flexible Cu$^{I}$ containing luminescent substances, we extend our previous investigations on two metal‐centered species to four metal‐centered complexes. These complexes could be a basis for designing new organic light‐emitting diode (OLED) relevant species. Both the synthesis and in‐depth spectroscopic analysis, combined with high‐level theoretical calculations are presented on a series of tetranuclear Cu$^{I}$ complexes with a halide containing Cu$_{4}$X$_{4}$ core (X=iodide, bromide or chloride) and two 2‐(diphenylphosphino)pyridine bridging ligands with a methyl group in para (4‐Me) or ortho (6‐Me) position of the pyridine ring. The structure of the electronic ground state is characterized by X‐ray diffraction, NMR, and IR spectroscopy with the support of theoretical calculations. In contrast to the para system, the complexes with ortho‐substituted bridging ligands show a remarkable and reversible temperature‐dependent dual phosphorescence. Here, we combine for the first time the luminescence thermochromism with time‐resolved FTIR spectroscopy. Thus, we receive experimental data on the structures of the two triplet states involved in the luminescence thermochromism. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000129566
Veröffentlicht am 11.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Physikalische Chemie (IPC)
Karlsruhe Nano Micro Facility (KNMF)
Institut für Biologische und Chemische Systeme (IBCS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0947-6539, 1521-3765
KITopen-ID: 1000129566
Erschienen in Chemistry - a European journal
Verlag Wiley
Vorab online veröffentlicht am 11.11.2020
Nachgewiesen in Scopus
Web of Science
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