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Ni compound (1) displays a polymeric crystal structure, with infinite chains of Ni<jats:sup>II<\/jats:sup>atoms adopting an octahedral N<jats:sub>4<\/jats:sub>O<jats:sub>2<\/jats:sub>coordination environment that involves four pyridine ligands and two bridging sulfate ligands. Cu compound (2) features a dimeric molecular structure, with the Cu<jats:sup>II<\/jats:sup>atoms possessing square-pyramidal N<jats:sub>3<\/jats:sub>O<jats:sub>2<\/jats:sub>coordination environments that contain three pyridine ligands and two bridging sulfate ligands. Zn compound (3) exhibits a polymeric crystal structure of infinite chains, with two alternating zinc coordination environments,<jats:italic>i.e.<\/jats:italic>octahedral N<jats:sub>4<\/jats:sub>O<jats:sub>2<\/jats:sub>coordination involving four pyridine ligands and two bridging sulfate ligands, and tetrahedral N<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub>coordination containing two pyridine ligands and two bridging sulfate ligands. The observed coordination environments are consistent with those predicted by crystal field theory.<\/jats:p>","DOI":"10.1107\/s2053229618001547","type":"journal-article","created":{"date-parts":[[2018,2,6]],"date-time":"2018-02-06T13:23:15Z","timestamp":1517923395000},"page":"263-268","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":7,"title":["First-row transition metal\u2013pyridine (py)\u2013sulfate [(py)<i><sub>x<\/sub>M<\/i>](SO<sub>4<\/sub>) complexes (<i>M<\/i>= Ni, Cu and Zn): crystal field theory in action"],"prefix":"10.1107","volume":"74","author":[{"given":"Mrittika","family":"Roy","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8599-1565","authenticated-orcid":true,"given":"Duyen N. 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