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The compound crystallizes in the orthorhombic space group<jats:italic>Pca<\/jats:italic>2<jats:sub>1<\/jats:sub>and is a racemic twin [BASF = 0.402\u2005(9)]. The geometry around the Hg<jats:sup>II<\/jats:sup>atom is distorted tetrahedral, with the Hg<jats:sup>II<\/jats:sup>atom coordinated to two N atoms, one Br atom, and a fourth coordination site is occupied by a mixed halide (Br\/Cl). For the two ligands in the asymmetric unit, there is disorder with one of the two<jats:italic>tert<\/jats:italic>-butyl groups and benzimidazole moieties showing twofold disorder, with occupancy factors of 0.57\u2005(2):0.43\u2005(2) for the<jats:italic>tert<\/jats:italic>-butyl group and 0.73\u2005(3):0.27\u2005(3) for the benzimidazole group. In addition, there is threefold disorder for two of the four<jats:italic>n<\/jats:italic>-pentyl groups, with occupancy factors of 0.669\u2005(4):0.177\u2005(4):0.154\u2005(4) and 0.662\u2005(4):0.224\u2005(4):0.154\u2005(4), respectively. The molecules form a one-dimensional helical polymer propagating in the<jats:italic>b<\/jats:italic>-axis direction. The helices are held together by intra-strand C\u2014H...Br and C\u2014H...Cl interactions. Each strand is further linked by inter-strand C\u2014H...Br and C\u2014H...Cl interactions. In addition, there are weak C\u2014H...N inter-strand interactions which further stabilize the structural arrangement.<\/jats:p>","DOI":"10.1107\/s2056989017002183","type":"journal-article","created":{"date-parts":[[2017,2,21]],"date-time":"2017-02-21T10:05:44Z","timestamp":1487671544000},"page":"423-428","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["Structure of the mercury(II) mixed-halide (Br\/Cl) complex of 2,2\u2032-(5-<i>tert<\/i>-butyl-1,3-phenylene)bis(1-pentyl-1<i>H<\/i>-benzo[<i>d<\/i>]imidazole)"],"prefix":"10.1107","volume":"73","author":[{"given":"Varsha","family":"Rani","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Harkesh B.","family":"Singh","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2770-7076","authenticated-orcid":true,"given":"Ray J.","family":"Butcher","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2017,2,21]]},"reference":[{"key":"zl2695_bb1","doi-asserted-by":"crossref","first-page":"m253","DOI":"10.1107\/S205698901502349X","volume":"71","author":"Bouchouit","year":"2015","journal-title":"Acta Cryst. 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