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Bolyai Research Scholarship","award":["BO\/00109\/17,"],"award-info":[{"award-number":["BO\/00109\/17,"]}]},{"name":"Magyar Tudom\u00e1nyos Akad\u00e9mia, J. 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The coordination compounds [Zn(A1)<jats:sub>2<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>2<\/jats:sub>] (<jats:bold>1<\/jats:bold>), [Zn(A2)<jats:sub>2<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)] (<jats:bold>2<\/jats:bold>), [Zn(A3)<jats:sub>2<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)]\u00b72H<jats:sub>2<\/jats:sub>O (<jats:bold>3<\/jats:bold>) and [Zn<jats:sub>2<\/jats:sub>(B1)<jats:sub>4<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>2<\/jats:sub>]\u00b74H<jats:sub>2<\/jats:sub>O (<jats:bold>4<\/jats:bold>), where the ligands are 1-methyl-4-oxidopyridinium-3-carboxylate (A1, C<jats:sub>7<\/jats:sub>H<jats:sub>6<\/jats:sub>NO<jats:sub>3<\/jats:sub>), 1,6-dimethyl-4-oxidopyridinium-3-carboxylate (A2, C<jats:sub>8<\/jats:sub>H<jats:sub>8<\/jats:sub>NO<jats:sub>3<\/jats:sub>), 1,5-dimethyl-4-oxido-pyridinium-3-carboxylate (A3, C<jats:sub>8<\/jats:sub>H<jats:sub>8<\/jats:sub>NO<jats:sub>3<\/jats:sub>) and 1-methyl-3-oxidopyridinium-4-carboxylate (B1, C<jats:sub>7<\/jats:sub>H<jats:sub>6<\/jats:sub>NO<jats:sub>3<\/jats:sub>), have been synthesized and analysed by single-crystal X-ray diffraction. The ligands were chosen to probe (i) the electronic effects of inverting the positions of the O-atom donor groups (<jats:italic>i.e.<\/jats:italic> A1 <jats:italic>versus<\/jats:italic> B1) and (ii) the electronic and steric effects of the addition of a second methyl group in different positions on the pyridine ring. Two axially coordinated water molecules resulting in a six-coordinated symmetrical octahedron complement the bis-ligand complex of A1. Ligands A2 and A3 form five-coordinated trigonal bipyramidal complexes with one additional water molecule in the coordination sphere, which is a rarely reported geometry for Zn<jats:sup>II<\/jats:sup> complexes. Ligand B1 shows a dimeric structure, where the two Zn<jats:sup>2+<\/jats:sup> dications have slightly distorted octahedral geometry and the pyridinolate O atom of the neighbouring complex bridges them. The coordination spheres of the Zn<jats:sup>2+<\/jats:sup> dications and the supramolecular structures are discussed in detail. The packing arrangements of <jats:bold>1<\/jats:bold>\u2013<jats:bold>3<\/jats:bold> are similar, having alternating hydrophilic and hydrophobic layers, however the similarity is broken in <jats:bold>4<\/jats:bold>. The obtained coordination geometries are compared with their previously determined Cu<jats:sup>II<\/jats:sup> analogues. The study of the individual complexes is complemented with a comprehensive analysis of Zn<jats:sup>II<\/jats:sup> complexes with oxygen donor ligands with data from the Cambridge Structural Database.<\/jats:p>","DOI":"10.1107\/s2052520621000299","type":"journal-article","created":{"date-parts":[[2021,3,1]],"date-time":"2021-03-01T12:30:02Z","timestamp":1614601802000},"page":"193-204","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":4,"title":["Crystal structures of zinc(II) complexes with \u03b2-hydroxypyridinecarboxylate ligands: examples of structure-directing effects used in inorganic crystal engineering"],"prefix":"10.1107","volume":"77","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4770-4681","authenticated-orcid":true,"given":"N\u00f3ra Veronika","family":"May","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kevin","family":"Nys","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. 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