{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T04:26:59Z","timestamp":1791088019891,"version":"4.1.0"},"reference-count":79,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2005,4,8]],"date-time":"2005-04-08T00:00:00Z","timestamp":1112918400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Chemistry A European J"],"published-print":{"date-parts":[[2005,5,20]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The selective synthesis of tetracoordinate square\u2010planar low\u2010spin nickel(<jats:sc>II<\/jats:sc>)\u2013semiquinonato (Ni<jats:sup>II<\/jats:sup>\u2010SQ) and nickel(<jats:sc>III<\/jats:sc>)\u2013catecholato (Ni<jats:sup>III<\/jats:sup>\u2010Cat) complexes, <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold>, respectively, was achieved by using bidentate ligands with modulated nitrogen\u2010donor ability to the nickel ion. The electronic structures of <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold> were revealed by XPS and EPR measurements. The absorption spectra of <jats:bold>1<\/jats:bold> and <jats:bold>2<\/jats:bold> in a noncoordinating solvent, dichloromethane (CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub>), are completely different from those in tetrahydrofuran (THF), being a coordinating solvent. As expected from this result, the gradual addition of <jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>\u2010dimethylformamide (DMF), which is also a coordinating solvent like THF, into a solution of <jats:bold>1<\/jats:bold> or <jats:bold>2<\/jats:bold> in CH<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub> leads to color changes from blue (for <jats:bold>1<\/jats:bold>) and brown (for <jats:bold>2<\/jats:bold>) to light green, which is the same color observed for solutions of <jats:bold>1<\/jats:bold> or <jats:bold>2<\/jats:bold> in THF. Furthermore, the same color changes are induced by varying the temperature. Such spectral changes are attributable to the transformation from square\u2010planar low\u2010spin Ni<jats:sup>II<\/jats:sup>\u2010SQ and Ni<jats:sup>III<\/jats:sup>\u2010Cat complexes to octahedral high\u2010spin Ni<jats:sup>II<\/jats:sup>\u2010SQ ones, caused by the coordination of two solvent molecules to the nickel ion.<\/jats:p>","DOI":"10.1002\/chem.200500068","type":"journal-article","created":{"date-parts":[[2005,4,8]],"date-time":"2005-04-08T07:10:46Z","timestamp":1112944246000},"page":"3420-3426","source":"Crossref","is-referenced-by-count":37,"title":["Electronic Structural Changes between Nickel(<scp>II<\/scp>)\u2013Semiquinonato and Nickel(<scp>III<\/scp>)\u2013Catecholato States Driven by Chemical and Physical 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