{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T15:20:15Z","timestamp":1791645615445,"version":"4.3.4"},"reference-count":0,"publisher":"International Union of Crystallography (IUCr)","issue":"6","license":[{"start":{"date-parts":[[2019,5,31]],"date-time":"2019-05-31T00:00:00Z","timestamp":1559260800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},{"start":{"date-parts":[[2019,5,31]],"date-time":"2019-05-31T00:00:00Z","timestamp":1559260800000},"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":[[2019,5,22]]},"published-print":{"date-parts":[[2019,6,1]]},"abstract":"<jats:p>Six reaction products of Zn<jats:sup>II<\/jats:sup> and Ni<jats:sup>II<\/jats:sup> with pyridine-2,6-dicarboxylic acid (H<jats:sub>2<\/jats:sub>Lig<jats:sup>1<\/jats:sup>), 4-chloropyridine-2,6-dicarboxylic acid (H<jats:sub>2<\/jats:sub>Lig<jats:sup>2<\/jats:sup>) and 4-hydroxypyridine-2,6-dicarboxylic acid (H<jats:sub>2<\/jats:sub>Lig<jats:sup>3<\/jats:sup>) are used to pinpoint the structural consequences of crystal field stabilization by an incomplete <jats:italic>d<\/jats:italic> shell. The pseudo-octahedral Zn<jats:sup>II<\/jats:sup> coordination sphere in bis(6-carboxypicolinato)zinc(II) trihydrate, [Zn(C<jats:sub>7<\/jats:sub>H<jats:sub>4<\/jats:sub>NO<jats:sub>4<\/jats:sub>)<jats:sub>2<\/jats:sub>]\u00b73H<jats:sub>2<\/jats:sub>O or [Zn(HLig<jats:sup>1<\/jats:sup>)<jats:sub>2<\/jats:sub>]\u00b73H<jats:sub>2<\/jats:sub>O, (<jats:bold>1<\/jats:bold>), is significantly less regular than that about Ni<jats:sup>II<\/jats:sup> in the isostructural compound bis(6-carboxypicolinato)nickel(II) trihydrate, [Ni(C<jats:sub>7<\/jats:sub>H<jats:sub>4<\/jats:sub>NO<jats:sub>4<\/jats:sub>)<jats:sub>2<\/jats:sub>]\u00b73H<jats:sub>2<\/jats:sub>O or [Ni(HLig<jats:sup>1<\/jats:sup>)<jats:sub>2<\/jats:sub>]\u00b73H<jats:sub>2<\/jats:sub>O, (<jats:bold>2<\/jats:bold>). The Zn<jats:sup>II<\/jats:sup> complexes poly[(4-chloropyridine-2,6-dicarboxylato)zinc(II)], [Zn(C<jats:sub>7<\/jats:sub>H<jats:sub>2<\/jats:sub>ClNO<jats:sub>4<\/jats:sub>)]<jats:sub>\n                     <jats:italic>n<\/jats:italic>\n                  <\/jats:sub> or [Zn(Lig<jats:sup>2<\/jats:sup>)]<jats:sub>\n                     <jats:italic>n<\/jats:italic>\n                  <\/jats:sub>, (<jats:bold>3<\/jats:bold>), and poly[[(4-hydroxypyridine-2,6-dicarboxylato)zinc(II)] monohydrate], {[Zn(C<jats:sub>7<\/jats:sub>H<jats:sub>3<\/jats:sub>NO<jats:sub>5<\/jats:sub>)]\u00b7H<jats:sub>2<\/jats:sub>O}<jats:sub>\n                     <jats:italic>n<\/jats:italic>\n                  <\/jats:sub> or {[Zn(Lig<jats:sup>3<\/jats:sup>)]\u00b7H<jats:sub>2<\/jats:sub>O}<jats:sub>\n                     <jats:italic>n<\/jats:italic>\n                  <\/jats:sub>, (<jats:bold>4<\/jats:bold>), represent two-dimensional coordination polymers with chelating and bridging pyridine-2,6-dicarboxylate ligands in which the coordination polyhedra about the central cations cannot be associated with any regular shape; their coordination environments range between trigonal\u2013bipyramidal and square-pyramidal geometries. In contrast, the corresponding adducts of the diprotonated ligands to Ni<jats:sup>II<\/jats:sup>, namely triaqua(4-chloropyridine-2,6-dicarboxylato)nickel(II), [Ni(C<jats:sub>7<\/jats:sub>H<jats:sub>2<\/jats:sub>ClNO<jats:sub>4<\/jats:sub>)(H<jats:sub>2<\/jats:sub>O)<jats:sub>3<\/jats:sub>] or [NiLig<jats:sup>2<\/jats:sup>(OH<jats:sub>2<\/jats:sub>)<jats:sub>3<\/jats:sub>)], (<jats:bold>5<\/jats:bold>), and triaqua(4-hydroxypyridine-2,6-dicarboxylato)nickel(II) 1.7-hydrate, [Ni(C<jats:sub>7<\/jats:sub>H<jats:sub>3<\/jats:sub>NO<jats:sub>5<\/jats:sub>)(H<jats:sub>2<\/jats:sub>O)<jats:sub>3<\/jats:sub>]\u00b71.7H<jats:sub>2<\/jats:sub>O or [NiLig<jats:sup>3<\/jats:sup>(OH<jats:sub>2<\/jats:sub>)<jats:sub>3<\/jats:sub>)]\u00b71.7H<jats:sub>2<\/jats:sub>O, (<jats:bold>6<\/jats:bold>), feature rather regular octahedral coordination spheres about the transition-metal cations, thus precluding the formation of analogous extended structures.<\/jats:p>","DOI":"10.1107\/s2056989019007461","type":"journal-article","created":{"date-parts":[[2019,5,31]],"date-time":"2019-05-31T10:50:00Z","timestamp":1559299800000},"page":"903-911","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":9,"title":["Zn and Ni complexes of pyridine-2,6-dicarboxylates: crystal field stabilization matters!"],"prefix":"10.1107","volume":"75","author":[{"given":"Marius","family":"Kremer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2623-0061","authenticated-orcid":true,"given":"Ulli","family":"Englert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2019,5,31]]},"container-title":["Acta Crystallographica Section E Crystallographic 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