{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,3]],"date-time":"2025-11-03T13:32:51Z","timestamp":1762176771147,"version":"3.33.0"},"reference-count":30,"publisher":"International Union of Crystallography (IUCr)","issue":"12","license":[{"start":{"date-parts":[[2014,11,15]],"date-time":"2014-11-15T00:00:00Z","timestamp":1416009600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/uk\/legalcode"},{"start":{"date-parts":[[2014,11,15]],"date-time":"2014-11-15T00:00:00Z","timestamp":1416009600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0\/uk\/legalcode"}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr E Struct Rep Online","Acta Crystallogr E","Acta Cryst E","Acta Cryst E Struct Rep Online","Acta Cryst Sect E","Acta Cryst Sect E Struct Rep Online","Acta Crystallogr Sect E","Acta Crystallogr Sect E Struct Rep Online"],"published-print":{"date-parts":[[2014,12,15]]},"abstract":"<jats:p>The title compounds, calcium perchlorate tetrahydrate and calcium perchlorate hexahydrate, were crystallized at low temperatures according to the solid\u2013liquid phase diagram. The structure of the tetrahydrate consists of one Ca<jats:sup>2+<\/jats:sup>cation eightfold coordinated in a square-antiprismatic fashion by four water molecules and four O atoms of four perchlorate tetrahedra, forming chains parallel to [01-1] by sharing corners of the ClO<jats:sub>4<\/jats:sub>tetrahedra. The structure of the hexahydrate contains two different Ca<jats:sup>2+<\/jats:sup>cations, each coordinated by six water molecules and two O atoms of two perchlorate tetrahedra, forming [Ca(H<jats:sub>2<\/jats:sub>O)<jats:sub>6<\/jats:sub>(ClO<jats:sub>4<\/jats:sub>)]<jats:sub>2<\/jats:sub>dimers by sharing two ClO<jats:sub>4<\/jats:sub>tetrahedra. The dimers are arranged in sheets parallel (001) and alternate with layers of non-coordinating ClO<jats:sub>4<\/jats:sub>tetrahedra. O\u2014H...O hydrogen bonds between the water molecules as donor and ClO<jats:sub>4<\/jats:sub>tetrahedra and water molecules as acceptor groups lead to the formation of a three-dimensional network in the two structures. Ca(ClO<jats:sub>4<\/jats:sub>)<jats:sub>2<\/jats:sub>\u00b76H<jats:sub>2<\/jats:sub>O was refined as a two-component inversion twin, with an approximate twin component ratio of 1:1 in each of the two structures.<\/jats:p>","DOI":"10.1107\/s1600536814024532","type":"journal-article","created":{"date-parts":[[2014,11,14]],"date-time":"2014-11-14T09:09:10Z","timestamp":1415956150000},"page":"489-493","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":5,"title":["Crystal structures of Ca(ClO<sub>4<\/sub>)<sub>2<\/sub>\u00b74H<sub>2<\/sub>O and Ca(ClO<sub>4<\/sub>)<sub>2<\/sub>\u00b76H<sub>2<\/sub>O"],"prefix":"10.1107","volume":"70","author":[{"given":"Erik","family":"Hennings","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Horst","family":"Schmidt","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wolfgang","family":"Voigt","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2014,11,15]]},"reference":[{"key":"wm5079_bb1","unstructured":"Brandenburg, K. 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