{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T18:41:50Z","timestamp":1785436910888,"version":"3.56.0"},"reference-count":26,"publisher":"International Union of Crystallography (IUCr)","issue":"5","license":[{"start":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T00:00:00Z","timestamp":1745452800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},{"start":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T00:00:00Z","timestamp":1745452800000},"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":[[2025,4,17]]},"published-print":{"date-parts":[[2025,5,1]]},"abstract":"<jats:p>\n                    The asymmetric unit of the title compound, {[Cu\n                    <jats:sub>2<\/jats:sub>\n                    (C\n                    <jats:sub>8<\/jats:sub>\n                    Cl\n                    <jats:sub>4<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    (C\n                    <jats:sub>4<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    N\n                    <jats:sub>2<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    (H\n                    <jats:sub>2<\/jats:sub>\n                    O)\n                    <jats:sub>2<\/jats:sub>\n                    ]\u00b7H\n                    <jats:sub>2<\/jats:sub>\n                    O}\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    or {[Cu\n                    <jats:sub>2<\/jats:sub>\n                    (Cl\n                    <jats:sub>4<\/jats:sub>\n                    bdc)\n                    <jats:sub>2<\/jats:sub>\n                    (pyz)\n                    <jats:sub>2<\/jats:sub>\n                    (H\n                    <jats:sub>2<\/jats:sub>\n                    O)\n                    <jats:sub>2<\/jats:sub>\n                    ]\u00b7H\n                    <jats:sub>2<\/jats:sub>\n                    O}\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    comprises of a Cu\n                    <jats:sup>II<\/jats:sup>\n                    ion, one tetrachlorobenzenedicarboxylate ion (Cl\n                    <jats:sub>4<\/jats:sub>\n                    bdc\n                    <jats:sup>2\u2212<\/jats:sup>\n                    ), one pyrazine ligand (pyz), and one and a half water molecules. The Cu\n                    <jats:sup>II<\/jats:sup>\n                    ion exhibits a five-coordinated square-pyramidal geometry with a CuN\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    coordination environment comprising two oxygen atoms of the Cl\n                    <jats:sub>4<\/jats:sub>\n                    bdc\n                    <jats:sup>2\u2212<\/jats:sup>\n                    ligands, one oxygen atom of a water molecule, and two nitrogen atoms of the pyz ligands. The carboxylate group is almost perpendicular to the benzene ring and shows monodentate coordination to the Cu\n                    <jats:sup>II<\/jats:sup>\n                    ion. The Cu\n                    <jats:sup>II<\/jats:sup>\n                    ions of these units are bridged by both the Cl\n                    <jats:sub>4<\/jats:sub>\n                    bdc\n                    <jats:sup>2\u2212<\/jats:sup>\n                    and pyz ligands to form two-dimensional (2D) layers, which are linked by alternating hydrogen-bonding and C\u2014Cl...\u03c0 interactions to yield a three-dimensional network.\n                  <\/jats:p>","DOI":"10.1107\/s2056989025003457","type":"journal-article","created":{"date-parts":[[2025,4,22]],"date-time":"2025-04-22T02:45:22Z","timestamp":1745289922000},"page":"429-432","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["Crystal structure of poly[[aqua(\u03bc\n                    <sub>2<\/sub>\n                    -pyrazine-\u03ba\n                    <sup>2<\/sup>\n                    <i>N<\/i>\n                    :\n                    <i>N<\/i>\n                    \u2032)(\u03bc\n                    <sub>2<\/sub>\n                    -2,3,5,6-tetrachlorobenzene-1,4-dicarboxylato-\u03ba\n                    <sup>2<\/sup>\n                    <i>O<\/i>\n                    <sup>1<\/sup>\n                    :\n                    <i>O<\/i>\n                    <sup>4<\/sup>\n                    )copper(II)] hemihydrate]"],"prefix":"10.1107","volume":"81","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7996-7836","authenticated-orcid":true,"given":"Hitoshi","family":"Kumagai","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7615-6517","authenticated-orcid":true,"given":"Satoshi","family":"Kawata","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00msqp585","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6305-6859","authenticated-orcid":true,"given":"Nobuhiro","family":"Ogihara","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2025,4,24]]},"reference":[{"key":"jp2018_bb1","first-page":"435","volume":"27","author":"Altomare","year":"1994","journal-title":"J. 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