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Their solid\u2010state structures were investigated by single crystal X\u2010ray diffraction, showing the tendency to overcome the square\u2010planar 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\n                    <jats:bold>[Zn(1)(py)]<\/jats:bold>\n                    has been characterized by MC\u2010PDFT to validate the results of extended TD\u2010DFT studies. Green emission of non\u2010emissive solutions of\n                    <jats:bold>[Zn(1\u20133)]<\/jats:bold>\n                    in chloroform could be switched on in the presence of potent Lewis\u2010bases. While interpretation in terms of an equilibrium of stacked\/non\u2010fluorescent and destacked\/fluorescent species is in line with precedents from literature, the sensitivity of\n                    <jats:bold>[Zn(1\u20133)]<\/jats:bold>\n                    was greatly reduced. Results of a computation\u2010based structure search allow to trace the hidden Lewis acidity of\n                    <jats:bold>[Zn(1\u20133)]<\/jats:bold>\n                    to a new stacking motif, resulting in a strongly enhanced stability of the dimers.\n                  <\/jats:p>","DOI":"10.1002\/chem.202102086","type":"journal-article","created":{"date-parts":[[2021,8,25]],"date-time":"2021-08-25T07:21:29Z","timestamp":1629876089000},"page":"15159-15171","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Quenched Lewis Acidity: Studies on the Medium Dependent Fluorescence of Zinc(II) Complexes"],"prefix":"10.1002","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9259-1818","authenticated-orcid":false,"given":"Hannah","family":"Kurz","sequence":"first","affiliation":[{"name":"Inorganic Chemistry IV University of Bayreuth  Universit\u00e4tsstra\u00dfe 30 95447 Bayreuth 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