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Quenched Lewis Acidity : Studies on the Medium Dependent Fluorescence of Zinc(II) Complexes

Titelangaben

Kurz, Hannah ; Hörner, Gerald ; Weser, Oskar ; Li Manni, Giovanni ; Weber, Birgit:
Quenched Lewis Acidity : Studies on the Medium Dependent Fluorescence of Zinc(II) Complexes.
In: Chemistry : a European Journal. Bd. 27 (2021) Heft 61 . - S. 15159-15171.
ISSN 1521-3765
DOI: https://doi.org/10.1002/chem.202102086

Volltext

Link zum Volltext (externe URL): Volltext

Abstract

Three new zinc(II) coordination units [Zn(1–3)] based on planar-directing tetradentate Schiff base-like ligands H2(1–3) were synthesized. Their solid-state structures were investigated by single crystal X-ray diffraction, showing the tendency to overcome the square-planar coordination sphere by axial ligation. Affinity in solution towards axial ligation has been tested by extended spectroscopic studies, both in the absorption and emission mode. The electronic spectrum of the pyridine complex [Zn(1)(py)] has been characterized by MC-PDFT to validate the results of extended TD-DFT studies. Green emission of non-emissive solutions of [Zn(1–3)] in chloroform could be switched on in the presence of potent Lewis-bases. While interpretation in terms of an equilibrium of stacked/non-fluorescent and destacked/fluorescent species is in line with precedents from literature, the sensitivity of [Zn(1–3)] was greatly reduced. Results of a computation-based structure search allow to trace the hidden Lewis acidity of [Zn(1–3)] to a new stacking motif, resulting in a strongly enhanced stability of the dimers.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: CASSCF; dimerization; fluorescence; Schiff base; zinc
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Professur Anorganische Chemie IV > Professur Anorganische Chemie IV - Univ.-Prof. Dr. Birgit Weber
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Professur Anorganische Chemie IV
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 07 Okt 2021 08:43
Letzte Änderung: 20 Apr 2022 06:24
URI: https://eref.uni-bayreuth.de/id/eprint/67213