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Single crystal X\u2010ray structure determinations for <jats:bold>1<\/jats:bold>, <jats:bold>3<\/jats:bold> and <jats:bold>4<\/jats:bold> reveal N<jats:sub>2<\/jats:sub>,O<jats:sub>2<\/jats:sub>\u2010metal coordination of two chelating Schiff base ligands in a square\u2010planar geometry. Powder X\u2010ray diffractograms confirm the phase purity of the bulk microcrystalline samples. Thermal analyses by differential scanning calorimetry (DSC) and polarized light microscopic (PLM) indicate the copper(II) complexes to exhibit cold crystal (<jats:bold>2<\/jats:bold>) and liquid crystal (<jats:bold>4<\/jats:bold>) property. Cyclic voltammograms suggest an irreversible electrochemical process with two one electron charge transfer processes in <jats:italic>N,N<\/jats:italic>\u2010dimethylformamide. Variable temperature magnetic measurements at the solid\u2010state prove the diamagnetic nature of the low\u2010spin Ni<jats:sup>2+<\/jats:sup> centres in <jats:bold>1<\/jats:bold> or <jats:bold>3<\/jats:bold>, as expected from the square\u2010planar coordination geometry with rather strong ligands. The complexes expose medium level of antioxidant activity in methanol. Optimized geometry and excited state property by DFT\/TD\u2010DFT correspond well to the experimental results of the electronic and molecular structure at the ground state.<\/jats:p>","DOI":"10.1002\/asia.202400915","type":"journal-article","created":{"date-parts":[[2024,9,21]],"date-time":"2024-09-21T02:24:07Z","timestamp":1726885447000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Cold and Liquid Crystal Properties of Square\u2010Planar Copper(II) Versus Nickel(II)\u2010 Iminophenolate\/Naphthalen\u20102\u2010Olate Schiff Base Complexes"],"prefix":"10.1002","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0550-8797","authenticated-orcid":false,"given":"Imdadul","family":"Haque","sequence":"first","affiliation":[{"name":"Department of Chemistry Jahangirnagar University  Dhaka 1342 Bangladesh"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6905-3210","authenticated-orcid":false,"given":"Mohammed","family":"Enamullah","sequence":"additional","affiliation":[{"name":"Department of Chemistry Jahangirnagar University  Dhaka 1342 Bangladesh"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amina Khan","family":"Resma","sequence":"additional","affiliation":[{"name":"Department of Chemistry Jahangirnagar University  Dhaka 1342 Bangladesh"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nisat Taslum","family":"Jhumur","sequence":"additional","affiliation":[{"name":"Department of Chemistry Jahangirnagar University  Dhaka 1342 Bangladesh"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dennis","family":"Woschko","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie und Strukturchemie Universit\u00e4t D\u00fcsseldorf  Universit\u00e4tsstr. 1 D-40225 D\u00fcsseldorf Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdulrahman","family":"Mohabbat","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie und Strukturchemie Universit\u00e4t D\u00fcsseldorf  Universit\u00e4tsstr. 1 D-40225 D\u00fcsseldorf Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan","family":"van Leusen","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie RWTH Aachen University  Landoltweg 1 D-52074 Aachen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul","family":"K\u00f6gerler","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie RWTH Aachen University  Landoltweg 1 D-52074 Aachen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"Janiak","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie und Strukturchemie Universit\u00e4t D\u00fcsseldorf  Universit\u00e4tsstr. 1 D-40225 D\u00fcsseldorf Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,10,31]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.199103751"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0010-8545(92)80025-M"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr00019a002"},{"key":"e_1_2_8_4_1","volume-title":"Synthesis, Metallomesogens: Properties and Applications","author":"Serrano J. 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