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In main group chemistry, this concept has only started getting attention recently. We report stimuli responsive low\u2010valent silicon compounds exhibiting electromerism. A mixed\u2010valent silaiminyl\u2010silylene<jats:bold>1<\/jats:bold>, [<jats:bold>L<\/jats:bold>Si\u2212Si(NDipp)<jats:bold>L<\/jats:bold>] (<jats:bold>L=<\/jats:bold>PhC(N<jats:sup><jats:italic>t<\/jats:italic><\/jats:sup>Bu)<jats:sub>2<\/jats:sub>), was synthesized in a single step from amidinate\u2010chlorosilylene. Compound<jats:bold>1<\/jats:bold>has two interconnected Si atoms in formally +I and +III oxidation states. Upon treatment with Lewis acidic Cu<jats:sup>I<\/jats:sup>X (X=mesityl, Cl, Br, I), electron redistribution occurs resulting in the formation of [{<jats:bold>L<\/jats:bold>Si(NDipp)Si(<jats:bold>L<\/jats:bold>)}\u2212CuX], in which both silicon atoms are in the +II formal oxidation state. Removal of the copper center from [{<jats:bold>L<\/jats:bold>Si(NDipp)Si(<jats:bold>L<\/jats:bold>)}\u2212CuX] by using a Lewis basic carbene led to reformation of the precursor [<jats:bold>L<\/jats:bold>Si\u2212Si(NDipp)<jats:bold>L<\/jats:bold>]. Thus, the process is fully reversible. This showcases the first example of Lewis acid\/base\u2010induced reversible electromerism in silicon chemistry.<\/jats:p>","DOI":"10.1002\/anie.202211115","type":"journal-article","created":{"date-parts":[[2022,9,26]],"date-time":"2022-09-26T15:49:31Z","timestamp":1664207371000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Stimuli Responsive Silylene: Electromerism Induced Reversible Switching Between Mono\u2010 and Bis\u2010Silylene"],"prefix":"10.1002","volume":"61","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2375-7607","authenticated-orcid":false,"given":"Ravi","family":"Yadav","sequence":"first","affiliation":[{"name":"Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT) Engesserstra\u00dfe 15 76131 Karlsruhe 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