{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T10:14:54Z","timestamp":1774260894326,"version":"3.50.1"},"reference-count":18,"publisher":"International Union of Crystallography (IUCr)","issue":"8","license":[{"start":{"date-parts":[[2020,7,17]],"date-time":"2020-07-17T00:00:00Z","timestamp":1594944000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},{"start":{"date-parts":[[2020,7,17]],"date-time":"2020-07-17T00:00:00Z","timestamp":1594944000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/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":[[2020,7,13]]},"published-print":{"date-parts":[[2020,8,1]]},"abstract":"<jats:p>The title compound, [Ni(H<jats:sub>2<\/jats:sub>O)<jats:sub>6<\/jats:sub>][BaCr(C<jats:sub>2<\/jats:sub>O<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>3<\/jats:sub>]<jats:sub>2<\/jats:sub>\u00b74H<jats:sub>2<\/jats:sub>O, was obtained in the form of single crystals from the slow evaporation of an aqueous mixture of {Ba<jats:sub>6<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>17<\/jats:sub>[Cr(C<jats:sub>2<\/jats:sub>O<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub>]<jats:sub>4<\/jats:sub>}\u00b77H<jats:sub>2<\/jats:sub>O and NiSO<jats:sub>4<\/jats:sub>\u00b76H<jats:sub>2<\/jats:sub>O in the molar ratio 1:4. Its structure is made up of corrugated anionic (101) layers of formula [BaCr(C<jats:sub>2<\/jats:sub>O<jats:sub>4<\/jats:sub>)<jats:sub>3<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>3<\/jats:sub>]<jats:italic>\n                     <jats:sub>n<\/jats:sub>\n                     <jats:sup>n<\/jats:sup>\n                  <\/jats:italic>\n                  <jats:sup>\u2212<\/jats:sup> that leave voids accommodating the charge-compensating cations, [Ni(H<jats:sub>2<\/jats:sub>O)<jats:sub>6<\/jats:sub>]<jats:sup>2+<\/jats:sup> (point group symmetry \\overline{1}), as well as the water molecules of crystallization. The anionic layers are built from the connection of barium and chromium atoms through bridging oxalate ligands. The Cr<jats:sup>III<\/jats:sup> atom is hexacoordinated by O atoms of three oxalate ligands while the Ba<jats:sup>II<\/jats:sup> atom is tenfold coordinated by three O atoms of water molecules and seven O atoms of four oxalate ligands. Each Ni<jats:sup>II<\/jats:sup> atom sits on an inversion center and is coordinated by six water molecules. One of the uncoordinated water molecules is disordered over two sites, with a refined occupancy ratio of 0.51\u2005(5):0.49\u2005(5). In the crystal, extensive O\u2014H...O hydrogen-bonding interactions link the anionic layers, the charge-balancing cations as well as the water molecules of crystallization into a three-dimensional supramolecular network.<\/jats:p>","DOI":"10.1107\/s2056989020009536","type":"journal-article","created":{"date-parts":[[2020,7,17]],"date-time":"2020-07-17T09:13:41Z","timestamp":1594977221000},"page":"1316-1319","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":4,"title":["Hexaaquanickel(II) bis[triaqua-\u03bc<sub>3<\/sub>-oxalato-di-\u03bc-oxalato-bariumchromate(III)] tetrahydrate"],"prefix":"10.1107","volume":"76","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4346-939X","authenticated-orcid":true,"given":"Yves Alain","family":"Mbiangu\u00e9","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Manelsa Lande","family":"Ndinga","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jean Pierre","family":"Nduga","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emmanuel","family":"Wenger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Claude","family":"Lecomte","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2020,7,17]]},"reference":[{"key":"wm5572_bb1","doi-asserted-by":"crossref","first-page":"459","DOI":"10.1107\/S2056989015006520","volume":"71","author":"Alabada","year":"2015","journal-title":"Acta Cryst. 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