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In the solid state, Lumogen exists as the dihydroxy tautomer 1a (an azine, C\uf8feN\u2013N\uf8feC) as was already known from an X\u2010ray determination. In a deuterated dimethyl sulfoxide solution, another tautomer is observed besides 1a; its structure corresponds to the hydroxy\u2010oxo tautomer 1b (a hydrazone, C\uf8feN\u2013NH\u2013Csp<jats:sup>2<\/jats:sup>). In what concerns salicylaldazine, we have observed only the dihydroxy tautomer 2a. Copyright \u00a9 2013 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/mrc.3983","type":"journal-article","created":{"date-parts":[[2013,7,9]],"date-time":"2013-07-09T01:01:00Z","timestamp":1373331660000},"page":"530-540","source":"Crossref","is-referenced-by-count":6,"title":["The structures of two aldazines: [1,1\u2032\u2010(1<i>E<\/i>,1\u2032<i>E<\/i>)\u2010hydrazine\u20101,2\u2010diylidenebis(methan\u20101\u2010yl\u20101\u2010ylidene)dinaphthalen\u20102\u2010ol] (Lumogen) and 2,2\u2032\u2010(1<i>E<\/i>,1\u2032<i>E<\/i>)\u2010hydrazine\u20101,2\u2010diylidenebis(methan\u20101\u2010yl\u20101\u2010ylidene)diphenol (salicylaldazine) in the solid state and in solution"],"prefix":"10.1002","volume":"51","author":[{"given":"Artur M. S.","family":"Silva","sequence":"first","affiliation":[{"name":"Chemistry Department and QOPNA University of Aveiro  3810\u2010193 Aveiro Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vera L. 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