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

Title data

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. Vol. 27 (2021) Issue 61 . - pp. 15159-15171.
ISSN 1521-3765
DOI: https://doi.org/10.1002/chem.202102086

Official URL:

Abstract in another language

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.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Keywords:	CASSCF; dimerization; fluorescence; Schiff base; zinc
Institutions of the University:	Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry IV > Chair Inorganic Chemistry IV - Univ.-Prof. Dr. Birgit Weber Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry IV
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 540 Chemistry
Date Deposited:	07 Oct 2021 08:43
Last Modified:	20 Apr 2022 06:24
URI:	https://eref.uni-bayreuth.de/id/eprint/67213