{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,5]],"date-time":"2026-02-05T10:23:13Z","timestamp":1770286993927,"version":"3.49.0"},"reference-count":18,"publisher":"International Union of Crystallography (IUCr)","issue":"5","license":[{"start":{"date-parts":[[2022,4,22]],"date-time":"2022-04-22T00:00:00Z","timestamp":1650585600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},{"start":{"date-parts":[[2022,4,22]],"date-time":"2022-04-22T00:00:00Z","timestamp":1650585600000},"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":[[2022,4,11]]},"published-print":{"date-parts":[[2022,5,1]]},"abstract":"<jats:p>The thiolate nickel complexes {2-[({2-[(2-aminoethyl-\u03ba<jats:italic>N<\/jats:italic>)(methyl)amino-\u03ba<jats:italic>N<\/jats:italic>]ethyl}imino-\u03ba<jats:italic>N<\/jats:italic>)methyl]benzenethiolato-\u03ba<jats:italic>S<\/jats:italic>}nickel(II) chloride, [Ni(C<jats:sub>12<\/jats:sub>H<jats:sub>18<\/jats:sub>N<jats:sub>3<\/jats:sub>S)]Cl (<jats:bold>1<\/jats:bold>), and [2-({[2-(piperazin-1-yl-\u03ba<jats:sup>2<\/jats:sup>\n                  <jats:italic>N<\/jats:italic>\n                  <jats:sup>1<\/jats:sup>,<jats:italic>N<\/jats:italic>\n                  <jats:sup>4<\/jats:sup>)ethyl]imino-\u03ba<jats:italic>N<\/jats:italic>}methyl)benzenethiolato-\u03ba<jats:italic>S<\/jats:italic>]nickel(II) hexafluorophosphate dichloromethane monosolvate, [Ni(C<jats:sub>13<\/jats:sub>H<jats:sub>18<\/jats:sub>N<jats:sub>3<\/jats:sub>S)]PF<jats:sub>6<\/jats:sub>\u00b7CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub> (<jats:bold>2<\/jats:bold>), were synthesized by the reactions of 2-(<jats:italic>tert<\/jats:italic>-butylthio)benzaldehyde, triamines, and nickel(II) salts. Both complexes have a nickel ion surrounded by an <jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>\u2032,<jats:italic>N<\/jats:italic>\u2032\u2032,<jats:italic>S<\/jats:italic>-tetradentate ligand, forming a square-planar geometry. The terminal <jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>-chelating moiety is <jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>-dialkylethane-1,2-diamine for <jats:bold>1<\/jats:bold> and 1-alkylpiperazine for <jats:bold>2<\/jats:bold>. The N\u2014Ni\u2014N bite angle in the terminal <jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>-chelate ring in <jats:bold>2<\/jats:bold> [76.05\u2005(10)\u00b0] is much smaller than that in <jats:bold>1<\/jats:bold> [86.16\u2005(6)\u00b0]. Cyclic voltammograms of <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold> in aqueous media indicated that the reduction and oxidation potentials of <jats:bold>2<\/jats:bold> are more positive than those of <jats:bold>1<\/jats:bold>. The smaller bite angle of the terminal piperazine chelate in <jats:bold>2<\/jats:bold> reduces the electron-donating ability of the tetradentate ligand, resulting in a positive shift of the redox potentials. Both complexes exhibit catalytic activity for proton reduction, and the piperazine moiety in <jats:bold>2<\/jats:bold> is effective in reducing the overpotential.<\/jats:p>","DOI":"10.1107\/s2056989022003954","type":"journal-article","created":{"date-parts":[[2022,4,22]],"date-time":"2022-04-22T08:34:30Z","timestamp":1650616470000},"page":"500-505","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["Crystal structures and electrochemical properties of nickel(II) complexes with <i>N<\/i>,<i>N<\/i>\u2032,<i>N<\/i>\u2032\u2032,<i>S<\/i>-tetradentate Schiff base ligands"],"prefix":"10.1107","volume":"78","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9010-1945","authenticated-orcid":true,"given":"Masakazu","family":"Hirotsu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junhei","family":"Sanou","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3971-0611","authenticated-orcid":true,"given":"Toyotaka","family":"Nakae","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takumi","family":"Matsunaga","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Isamu","family":"Kinoshita","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2022,4,22]]},"reference":[{"key":"dj2045_bb1","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1107\/S0021889898007717","volume":"32","author":"Altomare","year":"1999","journal-title":"J. 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