{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,5]],"date-time":"2025-11-05T21:21:58Z","timestamp":1762377718966,"version":"build-2065373602"},"reference-count":26,"publisher":"International Union of Crystallography (IUCr)","issue":"8","license":[{"start":{"date-parts":[[2025,7,29]],"date-time":"2025-07-29T00:00:00Z","timestamp":1753747200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},{"start":{"date-parts":[[2025,7,29]],"date-time":"2025-07-29T00:00:00Z","timestamp":1753747200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr E Cryst Commun","Acta Cryst E","Acta Cryst Sect E","Acta Crystallogr E","Acta Crystallogr Sect E","Acta Cryst E Cryst Commun","Acta Cryst Sect E Cryst Commun"],"accepted":{"date-parts":[[2025,7,17]]},"published-print":{"date-parts":[[2025,8,1]]},"abstract":"\n trans<\/jats:italic>\n -Dibromidobis(3,5-lutidine)gold(III) tribromide, [AuBr\n 2<\/jats:sub>\n (C\n 7<\/jats:sub>\n H\n 9<\/jats:sub>\n N)\n 2<\/jats:sub>\n ](Br\n 3<\/jats:sub>\n ) or [(3,5-Lut)\n 2<\/jats:sub>\n AuBr\n 2<\/jats:sub>\n ](Br\n 3<\/jats:sub>\n ),\n 1<\/jats:bold>\n , polymorph\n a<\/jats:bold>\n , crystallizes in the space group\n P<\/jats:italic>\n 1<\/jats:overline>\n with\n Z<\/jats:italic>\n \u00a0= 1. The gold atom and the central bromine of the tribromide ion lie on inversion centres. Polymorph\n b<\/jats:bold>\n crystallizes in\n C<\/jats:italic>\n 222\n 1<\/jats:sub>\n with\n Z<\/jats:italic>\n = 4. The gold atom, the nitrogen atoms and the ring atoms at the 4-position of the lutidine ligands, and the central bromine of the tribromide ion all lie on twofold axes. The formula units of\n 1a<\/jats:bold>\n and\n 1b<\/jats:bold>\n are closely similar (including the relative orientations of anion and cation). 3,5-Lutidinium tetrabromidoaurate(III), (C\n 7<\/jats:sub>\n H\n 10<\/jats:sub>\n N)[AuBr\n 4<\/jats:sub>\n ] or (3,5-LutH)[AuBr\n 4<\/jats:sub>\n ],\n 2<\/jats:bold>\n , crystallizes as a new polymorph in\n P<\/jats:italic>\n 3\n 2<\/jats:sub>\n with\n Z<\/jats:italic>\n = 3. Bis(3,5-lutidinium) tetrabromidoaurate(III) bromide, (C\n 7<\/jats:sub>\n H\n 10<\/jats:sub>\n N)\n 2<\/jats:sub>\n [AuBr\n 4<\/jats:sub>\n ]Br or (3,5-LutH)\n 2<\/jats:sub>\n [AuBr\n 4<\/jats:sub>\n ]Br,\n 3<\/jats:bold>\n , polymorph\n a<\/jats:bold>\n , crystallizes in\n C<\/jats:italic>\n 2\/\n c<\/jats:italic>\n with\n Z<\/jats:italic>\n = 4. The gold atom lies on an inversion centre and the bromide ion on a twofold axis. Polymorph\n b<\/jats:bold>\n crystallizes in\n P<\/jats:italic>\n 2\n 1<\/jats:sub>\n \/\n c<\/jats:italic>\n with\n Z<\/jats:italic>\n = 8 (\n Z<\/jats:italic>\n \u2032 = 2) and all atoms on general positions. Tris(3,5-lutidinium) bis[tetrabromidoaurate(III)] bromide, (C\n 7<\/jats:sub>\n H\n 10<\/jats:sub>\n N)\n 3<\/jats:sub>\n [AuBr\n 4<\/jats:sub>\n ]\n 2<\/jats:sub>\n Br or (3,5-LutH)\n 3<\/jats:sub>\n [AuBr\n 4<\/jats:sub>\n ]\n 2<\/jats:sub>\n Br,\n 4<\/jats:bold>\n , crystallizes in\n P<\/jats:italic>\n 1<\/jats:overline>\n with\n Z<\/jats:italic>\n = 2. One gold atom lies on a general position and two on inversion centres. The main interest centres on the crystal packing patterns. In structure\n 1a<\/jats:bold>\n , a short Au...Br\n anion<\/jats:sub>\n contact, presumably a \u2018coinage bond', combines with a \u2018weak' hydrogen bond H\n \n ortho<\/jats:italic>\n <\/jats:sub>\n ...Br\n anion<\/jats:sub>\n and a further contact Br\n cation<\/jats:sub>\n ...Br\n anion<\/jats:sub>\n to form a layer structure parallel to the\n ac<\/jats:italic>\n plane. Polymorph\n 1b<\/jats:bold>\n shows similar Au...Br\n anion<\/jats:sub>\n and H\n \n ortho<\/jats:italic>\n <\/jats:sub>\n ...Br\n anion<\/jats:sub>\n contacts, resulting in a chain of residues parallel to the\n c<\/jats:italic>\n axis. The most striking feature of the previous polymorph of compound\n 2<\/jats:bold>\n was a topologically square, but distorted, network of tetrabromidoaurate ions. The packing of the new polymorph of\n 2<\/jats:bold>\n involves three-centre hydrogen bonds Br...H...Br\u2032, an axial coinage bond Au...Br, and two Br...Br contacts, one of which completes an unusual AuBr\n 2<\/jats:sub>\n three-centre system. The extended packing shows three one-dimensional arrays of residues parallel to the threefold axis, linked by one Br...Br contact to form a layer. In polymorph\n a<\/jats:bold>\n of compound\n 3<\/jats:bold>\n , the packing is based on a dimeric unit with twofold symmetry, centred on the free bromide ion, which is involved in two hydrogen bonds and two Br...Br interactions. The dimers are connected\n via<\/jats:italic>\n further Br...Br contacts to form a zigzag chain parallel to the\n c<\/jats:italic>\n axis. Polymorph\n b<\/jats:bold>\n displays two hydrogen-bonded (3,5-LutH...)\n 2<\/jats:sub>\n Br groupings to the two free bromides, together with two tetrabromidoaurate ions linked by a Br...Br contact; the second anion is also connected to a free bromide. The residues thus linked form a broad band parallel to the\n c<\/jats:italic>\n axis. There are also infinite stacks of planar residues with the repeating sequence (...[AuBr\n 4<\/jats:sub>\n ]\n \u2212<\/jats:sup>\n ...lutidinium...lutidinium...) parallel to the\n a<\/jats:italic>\n axis. In compound\n 4<\/jats:bold>\n , all three cations are hydrogen bonded to the free bromide. The anions at two gold centres (Au1\/Au2) form a chain parallel to the\n a<\/jats:italic>\n axis\n via<\/jats:italic>\n Br...Br contacts. The anions at Au3 combine with the free bromide to form a chain of Au\n 2<\/jats:sub>\n Br\n 4<\/jats:sub>\n rings parallel to the\n a<\/jats:italic>\n axis,\n via<\/jats:italic>\n Au...Br and Br...Br contacts, and these chains link with those at Au1\n via<\/jats:italic>\n another Br...Br contact to form a broad ribbon of residues. The ribbons are in turn linked by a Br...\u03c0 contact.\n <\/jats:p>","DOI":"10.1107\/s2056989025006401","type":"journal-article","created":{"date-parts":[[2025,7,29]],"date-time":"2025-07-29T07:29:49Z","timestamp":1753774189000},"page":"753-764","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["Crystal structures of\n trans<\/i>\n -dibromidobis(3,5-lutidine)gold(III) tribromide and three 3,5-lutidinium salts containing tetrabromidoaurate(III) anions (including three cases of polymorphism)"],"prefix":"10.1107","volume":"81","author":[{"given":"Cindy","family":"D\u00f6ring","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter G.","family":"Jones","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2025,7,29]]},"reference":[{"key":"yz2069_bb1","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1016\/j.poly.2014.04.064","volume":"79","author":"Amani","year":"2014","journal-title":"Polyhedron"},{"key":"yz2069_bb2","doi-asserted-by":"crossref","first-page":"249","DOI":"10.1016\/j.poly.2018.09.073","volume":"157","author":"Bocian","year":"2019","journal-title":"Polyhedron"},{"key":"yz2069_bb3","unstructured":"Bruker (1998). 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