{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T18:09:10Z","timestamp":1775758150855,"version":"3.50.1"},"reference-count":28,"publisher":"International Union of Crystallography (IUCr)","issue":"7","license":[{"start":{"date-parts":[[2025,6,12]],"date-time":"2025-06-12T00:00:00Z","timestamp":1749686400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},{"start":{"date-parts":[[2025,6,12]],"date-time":"2025-06-12T00:00:00Z","timestamp":1749686400000},"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":[[2025,5,30]]},"published-print":{"date-parts":[[2025,7,1]]},"abstract":"<jats:p>The structures of three 4-methylpyridinium tetrahalogenidoaurate(III) halides, one also including a dichloroiodate(I) anion, are presented. Bis(4-methylpiperidinium) tetrabromidoaurate(III) bromide, (4-Me-pipH)<jats:sub>2<\/jats:sub>[AuBr<jats:sub>4<\/jats:sub>]Br, <jats:bold>1<\/jats:bold>, crystallizes in space group <jats:italic>C<\/jats:italic>2\/<jats:italic>c<\/jats:italic> with <jats:italic>Z<\/jats:italic> = 4. The gold atom lies on the inversion centre 0.75, 0.75, 0.5 and the bromide ion on the twofold axis 0.5, <jats:italic>y<\/jats:italic>, 0.25. Bis(4-methylpiperidinium) tetrachloridoaurate(III) chloride, (4-Me-pipH)<jats:sub>2<\/jats:sub>[AuCl<jats:sub>4<\/jats:sub>]Cl, <jats:bold>2<\/jats:bold>, was obtained as three polymorphs, none of which is isotypic to <jats:bold>1<\/jats:bold>. Polymorph <jats:bold>2a<\/jats:bold> crystallizes in space group <jats:italic>P<\/jats:italic>2<jats:sub>1<\/jats:sub>\/<jats:italic>c<\/jats:italic> with <jats:italic>Z<\/jats:italic> = 4; all atoms lie on general positions. Polymorph <jats:bold>2b<\/jats:bold> crystallizes in space group <jats:italic>P<\/jats:italic>2\/<jats:italic>c<\/jats:italic> with <jats:italic>Z<\/jats:italic> = 8; two chloride ions lie on the twofold axes 0, <jats:italic>y<\/jats:italic>, 1\/4 and 0.5, <jats:italic>y<\/jats:italic>, 0.25. Polymorph <jats:bold>2c<\/jats:bold> crystallizes in space group <jats:italic>P<\/jats:italic>\n                  <jats:overline>1<\/jats:overline> with <jats:italic>Z<\/jats:italic> = 10; all atoms lie on general positions. Hexakis(4-methylpiperidinium) tetrakis{tetrachloridoaurate(III)} dichloroiodate(I) chloride, (4-Me-pipH)<jats:sub>6<\/jats:sub>[AuCl<jats:sub>4<\/jats:sub>]<jats:sub>4<\/jats:sub>(ICl<jats:sub>2<\/jats:sub>)Cl, <jats:bold>3<\/jats:bold>, crystallizes in space group <jats:italic>P<\/jats:italic>\n                  <jats:overline>1<\/jats:overline> with <jats:italic>Z<\/jats:italic> = 1; two gold atoms occupy inversion centres, as do the iodine atom and one chloride. This is the first time that we have observed the chlorinating agent PhICl<jats:sub>2<\/jats:sub> to be `non-innocent'. The main interest centres on the crystal packings, which involve hydrogen, halogen and coinage bonds, and display prominent substructures, one type involving the cations and the halides, and the other type involving the anions. A common feature in the packing of compounds <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold> is a chain consisting of cations linked by halide ions. In <jats:bold>1<\/jats:bold>, the chains are flanked by tetrabromidoaurate ions <jats:italic>via<\/jats:italic> short Br...Br contacts. The anions form zigzag chains <jats:italic>via<\/jats:italic> Br...Br<jats:sup>\u2212<\/jats:sup>...Br groupings. In polymorph <jats:bold>2a<\/jats:bold>, chains of cations and chloride ions connect to chains of tetrachloridoaurate ions to form a layer structure. In polymorph <jats:bold>2b<\/jats:bold>, cation\/chloride chains connect with chains of tetrachloridoaurate and chloride anions to form a layer structure; approximately linear Au...Cl<jats:sup>\u2212<\/jats:sup>...Au groupings are a striking feature (these are also seen in <jats:bold>2c<\/jats:bold> and <jats:bold>3<\/jats:bold>). The asymmetric unit of polymorph <jats:bold>2c<\/jats:bold> is an ensemble <jats:italic>ca<\/jats:italic> 27\u2005\u00c5 long. Cation\/chloride chains are linked by tetrachloridoaurates to form one-dimensional polymers. The tetrachloridoaurate and chloride ions associate to form a layer structure. In the packing of compound <jats:bold>3<\/jats:bold> the chloride\/tetrachloridoaurate substructure is dominant. Two tetrachloridoaurate ions associate with the free chloride to form a layer structure; the layers are linked in the third dimension <jats:italic>via<\/jats:italic> the third tetrachloroaurate and the dichloroiodate ions. There is no independent cation\/chloride substructure; the cations may be considered as being interspersed in the spaces of the anionic substructure, forming hydrogen bonds (some multicentred) to chlorine atoms of the anions. A brief database survey of other structures involving aryl- or alkylammonium cations, tetrahalogenidoaurates and halides is presented, including packing diagrams of selected examples.<\/jats:p>","DOI":"10.1107\/s2056989025004918","type":"journal-article","created":{"date-parts":[[2025,6,12]],"date-time":"2025-06-12T02:59:36Z","timestamp":1749697176000},"page":"600-612","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":3,"title":["Crystal structures of three 4-methylpiperidinium salts (one as three polymorphs) with tetrahalogenidoaurate(III), halide and (in one case) dichloroiodate(I) counter-anions"],"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":[[2025,6,12]]},"reference":[{"key":"yz2066_bb1","doi-asserted-by":"crossref","first-page":"263","DOI":"10.1016\/j.poly.2007.09.007","volume":"27","author":"Bourne","year":"2008","journal-title":"Polyhedron"},{"key":"yz2066_bb2","unstructured":"Bruker (1998). 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