{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,1]],"date-time":"2025-11-01T05:22:49Z","timestamp":1761974569109,"version":"build-2065373602"},"reference-count":12,"publisher":"International Union of Crystallography (IUCr)","issue":"8","license":[{"start":{"date-parts":[[2013,7,13]],"date-time":"2013-07-13T00:00:00Z","timestamp":1373673600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html"},{"start":{"date-parts":[[2013,7,13]],"date-time":"2013-07-13T00:00:00Z","timestamp":1373673600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/journals.iucr.org\/services\/copyrightpolicy.html#TDM"}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr C Cryst Struct Commun","Acta Cryst C","Acta Cryst Sect C","Acta Crystallogr C","Acta Crystallogr Sect C","Acta Crystallogr Sect C Cryst Struct Commun"],"published-print":{"date-parts":[[2013,8,15]]},"abstract":"<jats:p>(<jats:italic>E<\/jats:italic>)-2-(2-Benzylidenehydrazinylidene)quinoxaline, C<jats:sub>15<\/jats:sub>H<jats:sub>12<\/jats:sub>N<jats:sub>4<\/jats:sub>, crystallized with two molecules in the asymmetric unit. The structures of six halogen derivatives of this compound were also investigated: (<jats:italic>E<\/jats:italic>)-2-[2-(2-chlorobenzylidene)hydrazinylidene]quinoxaline, C<jats:sub>15<\/jats:sub>H<jats:sub>11<\/jats:sub>ClN<jats:sub>4<\/jats:sub>; (<jats:italic>E<\/jats:italic>)-2-[2-(3-chlorobenzylidene)hydrazinylidene]quinoxaline, C<jats:sub>15<\/jats:sub>H<jats:sub>11<\/jats:sub>ClN<jats:sub>4<\/jats:sub>; (<jats:italic>E<\/jats:italic>)-2-[2-(4-chlorobenzylidene)hydrazinylidene]quinoxaline, C<jats:sub>15<\/jats:sub>H<jats:sub>11<\/jats:sub>ClN<jats:sub>4<\/jats:sub>; (<jats:italic>E<\/jats:italic>)-2-[2-(2-bromobenzylidene)hydrazinylidene]quinoxaline, C<jats:sub>15<\/jats:sub>H<jats:sub>11<\/jats:sub>BrN<jats:sub>4<\/jats:sub>; (<jats:italic>E<\/jats:italic>)-2-[2-(3-bromobenzylidene)hydrazinylidene]quinoxaline, C<jats:sub>15<\/jats:sub>H<jats:sub>11<\/jats:sub>BrN<jats:sub>4<\/jats:sub>; (<jats:italic>E<\/jats:italic>)-2-[2-(4-bromobenzylidene)hydrazinylidene]quinoxaline, C<jats:sub>15<\/jats:sub>H<jats:sub>11<\/jats:sub>BrN<jats:sub>4<\/jats:sub>. The 3-Cl and 3-Br compounds are isomorphous, as are the 4-Cl and 4-Br compounds. In all of these compounds, it was found that the supramolecular structures are governed by similar predominant patterns,<jats:italic>viz.<\/jats:italic>strong intermolecular N\u2014H...N(pyrazine) hydrogen bonds supplemented by weak C\u2014H...N(pyrazine) hydrogen-bond interactions in the 2- and 3-halo compounds and by C\u2014H...Cl\/Br interactions in the 4-halo compounds. In all compounds, there are \u03c0\u2013\u03c0 stacking interactions.<\/jats:p>","DOI":"10.1107\/s0108270113015370","type":"journal-article","created":{"date-parts":[[2013,7,12]],"date-time":"2013-07-12T13:24:27Z","timestamp":1373635467000},"page":"920-926","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":3,"title":["Comparison of the structure of (<i>E<\/i>)-2-(2-benzylidenehydrazinylidene)quinoxaline with those of its chloro- and bromobenzylidene analogues"],"prefix":"10.1107","volume":"69","author":[{"given":"Ligia Rebelo","family":"Gomes","sequence":"first","affiliation":[]},{"given":"John Nicolson","family":"Low","sequence":"additional","affiliation":[]},{"given":"Ana S. M. C.","family":"Rodrigues","sequence":"additional","affiliation":[]},{"given":"James L.","family":"Wardell","sequence":"additional","affiliation":[]},{"given":"Marcus V. N.","family":"de Souza","sequence":"additional","affiliation":[]},{"given":"Thais C. 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