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In (I), the axial positions are occupied by a nitrogen atom from H<jats:sub>2<\/jats:sub>\n                  <jats:italic>L<\/jats:italic>\n                  <jats:sup>1<\/jats:sup> and an oxygen atom from the sulfate anion, whereas in (II), the axial positions contain two nitrogen atoms from two different H<jats:sub>2<\/jats:sub>\n                  <jats:italic>L<\/jats:italic>\n                  <jats:sup>1<\/jats:sup> ligands and the sulfate anion acts as the charge-balancing ion. \u03c0\u2013\u03c0 stacking between pyridine rings and a network of hydrogen bonds involving the water molecules and the sulfate anions play a crucial role in the molecular self-assembly of the two structures.<\/jats:p>","DOI":"10.1107\/s2056989018007351","type":"journal-article","created":{"date-parts":[[2018,7,6]],"date-time":"2018-07-06T08:30:39Z","timestamp":1530865839000},"page":"1049-1053","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["Two <i>N<\/i>,<i>N<\/i>\u2032-bis(pyridin-4-yl)pyridine-2,6-dicarboxamide coordination compounds"],"prefix":"10.1107","volume":"74","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2492-7121","authenticated-orcid":true,"given":"Yue-Xin","family":"Guo","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong-Cui","family":"Ma","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ren","family":"Bo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ning","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Li-Gang","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jin-Peng","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong-Wei","family":"Hou","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2018,7,6]]},"reference":[{"key":"cq2024_bb1","doi-asserted-by":"crossref","first-page":"86","DOI":"10.1016\/j.ica.2016.08.001","volume":"453","author":"Cheng","year":"2016","journal-title":"Inorg. 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