{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T18:49:16Z","timestamp":1770576556235,"version":"3.49.0"},"reference-count":37,"publisher":"Wiley","issue":"17","license":[{"start":{"date-parts":[[2006,7,13]],"date-time":"2006-07-13T00:00:00Z","timestamp":1152748800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Eur J Inorg Chem"],"published-print":{"date-parts":[[2006,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Third\u2010order nonlinear and linear optical properties ofnickel(II) and copper(II) complexes with salen ligands, functionalised with electron donor\/acceptor groups (DA\u2010salen), have been investigated in solution by the Z\u2010scan technique using an Nd:YAG laser (<jats:italic>\u03bb<\/jats:italic><jats:sub>inc<\/jats:sub> = 1064 nm) and UV\/Vis spectroscopy. The [M(DA\u2010<jats:italic>salen<\/jats:italic>)] complexes exhibit positive nonresonant nonlinear refractive indexes (<jats:italic>n<\/jats:italic><jats:sub>2<\/jats:sub><jats:sup>I<\/jats:sup>) in the range27.0\u20138.50<jats:bold>\u00b7<\/jats:bold>10<jats:sup>\u201321<\/jats:sup> m<jats:sup>2<\/jats:sup>\u2009W<jats:sup>\u20131<\/jats:sup> and nonlinear absorption coefficients (<jats:italic>\u03b1<\/jats:italic><jats:sub>2<\/jats:sub><jats:sup>I<\/jats:sup>) within the range 1.80\u201326.0<jats:bold>\u00b7<\/jats:bold>10<jats:sup>\u201317<\/jats:sup> m\u2009W<jats:sup>\u20131<\/jats:sup>. The latter values correspond to less than 10\u2009% of the overall magnitude of the third\u2010order susceptibility, |<jats:italic>\u03c7<\/jats:italic><jats:sub>3<\/jats:sub>|, which is the result of the absence of electronic transitions near <jats:italic>\u03bb<\/jats:italic><jats:sub>inc<\/jats:sub> = 1064 nm. For the group of Ni<jats:sup>II<\/jats:sup> complexes, the highest <jats:italic>n<\/jats:italic><jats:sub>2<\/jats:sub><jats:sup>I<\/jats:sup> values are exhibited by the complexes with aromatic diimine bridges and large \u03c0\u2010electron delocalisation, which leads to intense electronic charge\u2010transfer bands (<jats:italic>\u03f5<\/jats:italic> &gt; 16000 mol<jats:sup>\u20131<\/jats:sup>\u2009dm<jats:sup>3<\/jats:sup>\u2009cm<jats:sup>\u20131<\/jats:sup>) in the region <jats:italic>\u03bb<\/jats:italic> = 275\u2013500 nm. The complexes that exhibit charge\u2010transfer bands near <jats:italic>\u03bb<\/jats:italic><jats:sub>inc<\/jats:sub>\/2 = 532 nm, also show the highest <jats:italic>\u03b1<\/jats:italic><jats:sub>2<\/jats:sub><jats:sup>I<\/jats:sup> values, a consequence of multiphoton absorption processes. For the group of Cu<jats:sup>II<\/jats:sup> complexes, the highest <jats:italic>n<\/jats:italic><jats:sub>2<\/jats:sub><jats:sup>I<\/jats:sup> value is also observed by the complex that exhibits the most intense charge\u2010transfer bands in the region <jats:italic>\u03bb<\/jats:italic> = 275\u2013475 nm. Between Ni<jats:sup>II<\/jats:sup> and Cu<jats:sup>II<\/jats:sup> complexes with the same DA\u2010salen ligands, those of copper show always higher <jats:italic>n<\/jats:italic><jats:sub>2<\/jats:sub><jats:sup>I<\/jats:sup> values, indicating that NLO responses can also be fine\u2010tuned by the metalcentre. (\u00a9 Wiley\u2010VCH Verlag GmbH &amp; Co. KGaA, 69451 Weinheim, Germany, 2006)<\/jats:p>","DOI":"10.1002\/ejic.200600017","type":"journal-article","created":{"date-parts":[[2006,7,13]],"date-time":"2006-07-13T11:38:20Z","timestamp":1152790700000},"page":"3425-3433","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Third\u2010Order Nonlinear Optical Properties of DA\u2010salen\u2010Type Nickel(II) and Copper(II) Complexes"],"prefix":"10.1002","volume":"2006","author":[{"given":"Jo\u00e3o","family":"Tedim","sequence":"first","affiliation":[]},{"given":"S\u00f3nia","family":"Patr\u00edcio","sequence":"additional","affiliation":[]},{"given":"Rosa","family":"Bessada","sequence":"additional","affiliation":[]},{"given":"Rui","family":"Morais","sequence":"additional","affiliation":[]},{"given":"Carla","family":"Sousa","sequence":"additional","affiliation":[]},{"given":"Manuel B.","family":"Marques","sequence":"additional","affiliation":[]},{"given":"Cristina","family":"Freire","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2006,8,22]]},"reference":[{"key":"e_1_2_6_1_2","volume-title":"Handbook of Optics IV, Fiber Optics & Nonlinear Optics","author":"Bass M.","year":"2001"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/jp990137f"},{"key":"e_1_2_6_3_2","unstructured":"\u00a0"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/j100179a026"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/j100179a027"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1117\/1.601490"},{"key":"e_1_2_6_7_2","volume-title":"Comprehensive Coordination Chemistry II","author":"McCleverty J. 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