{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T20:05:08Z","timestamp":1778097908274,"version":"3.51.4"},"reference-count":58,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2024,1,19]],"date-time":"2024-01-19T00:00:00Z","timestamp":1705622400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>The coordination chemistry of 2-pyridyl ketoximes continues to attract the interest of many inorganic chemistry groups around the world for a variety of reasons. Cadmium(II) complexes of such ligands have provided models of solvent extraction of this toxic metal ion from aqueous environments using 2-pyridyl ketoxime extractants. Di-2-pyridyl ketone oxime (dpkoxH) is a unique member of this family of ligands because its substituent on the oxime carbon bears another potential donor site, i.e., a second 2-pyridyl group. The goal of this study was to investigate the reactions of cadmium(II) halides and dpkoxH in order to assess the structural role (if any) of the halogeno ligand and compare the products with their zinc(II) analogs. The synthetic studies provided access to complexes {[CdCl2(dpkoxH)\u22192H2O]}n (1\u22192H2O), {[CdBr2(dpkoxH)]}n (2) and {[CdI2(dpkoxH)]}n (3) in 50\u201360% yields. The structures of the complexes were determined by single-crystal X-ray crystallography. The compounds consist of structurally similar 1D zigzag chains, but only 2 and 3 are strictly isomorphous. Neighboring CdII atoms are alternately doubly bridged by halogeno and dpkoxH ligands, the latter adopting the \u03b71:\u03b71:\u03b71:\u03bc (or 2.0111 using Harris notation) coordination mode. A terminal halogeno group completes distorted octahedral coordination at each metal ion, and the coordination sphere of the CdII atoms is {CdII(\u03b71 \u2212 X)(\u03bc \u2212 X)2(Npyridyl)2(Noxime)} (X = Cl, Br, I). The trans-donor\u2013atom pairs in 1\u22192H2O are Clterminal\/Noxime and two Clbridging\/Npyridyl; on the contrary, these donor\u2013atom pairs are Xterminal\/Npyridyl, Xbridging\/Noxime, and Xbridging\/Npyridyl (X = Br, I). There are intrachain H-bonding interactions in the structures. The packing of the chains in 1\u22192H2O is achieved via \u03c0-\u03c0 stacking interactions, while the 3D architecture of the isomorphous 2 and 3 is built via C-H\u2219\u2219\u2219Cg (Cg is the centroid of one pyridyl ring) and \u03c0-\u03c0 overlaps. The molecular structures of 1\u22192H2O and 2 are different compared with their [ZnX2(dpkoxH)] (X = Cl, Br) analogs. The polymeric compounds were characterized by IR and Raman spectroscopies in the solid state, and the data were interpreted in terms of the known molecular structures. The solid-state structures of the complexes are not retained in DMSO, as proven via NMR (1H, 13C, and 113Cd NMR) spectroscopy and molar conductivity data. The complexes completely release the coordinated dpkoxH molecule, and the dominant species in solution seem to be [Cd(DMSO)6]2+ in the case of the chloro and bromo complexes and [CdI2(DMSO)4].<\/jats:p>","DOI":"10.3390\/molecules29020509","type":"journal-article","created":{"date-parts":[[2024,1,19]],"date-time":"2024-01-19T09:46:39Z","timestamp":1705657599000},"page":"509","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Reactions of Cadmium(II) Halides and Di-2-Pyridyl Ketone Oxime: One-Dimensional Coordination Polymers"],"prefix":"10.3390","volume":"29","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2085-7135","authenticated-orcid":false,"given":"Christina","family":"Stamou","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Patras, 26504 Patras, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7850-2260","authenticated-orcid":false,"given":"Pierre","family":"Dechambenoit","sequence":"additional","affiliation":[{"name":"Centre de Recherche Paul Pascal, UMR 5031, CNRS, University of Bordeaux, 33600 Pessac, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0985-2579","authenticated-orcid":false,"given":"Zoi G.","family":"Lada","sequence":"additional","affiliation":[{"name":"Institute of Chemical Engineering Sciences, Foundation for Research and Technology-Hellas (FORTH\/ICE-HT), Platani, P.O. Box 1414, 26504 Patras, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patroula","family":"Gkolfi","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Patras, 26504 Patras, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vassiliki","family":"Riga","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Patras, 26504 Patras, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8775-5427","authenticated-orcid":false,"given":"Catherine P.","family":"Raptopoulou","sequence":"additional","affiliation":[{"name":"Institute of Nanoscience and Nanotechnology, NCSR \u201cDemokritos\u201d, 15310 Aghia Paraskevi Attikis, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1280-3199","authenticated-orcid":false,"given":"Vassilis","family":"Psycharis","sequence":"additional","affiliation":[{"name":"Institute of Nanoscience and Nanotechnology, NCSR \u201cDemokritos\u201d, 15310 Aghia Paraskevi Attikis, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7366-5682","authenticated-orcid":false,"given":"Konstantis F.","family":"Konidaris","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Materials Science and Chemical Engineering \u201cGiulio Natta\u201d, Via L. Mancinelli 7, 20131 Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8728-6245","authenticated-orcid":false,"given":"Christos T.","family":"Chasapis","sequence":"additional","affiliation":[{"name":"Institute of Chemical Biology, National Hellenic Research Foundation, 11635 Athens, Greece"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Spyros P.","family":"Perlepes","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Patras, 26504 Patras, Greece"},{"name":"Institute of Chemical Engineering Sciences, Foundation for Research and Technology-Hellas (FORTH\/ICE-HT), Platani, P.O. 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