{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T19:44:27Z","timestamp":1760384667087,"version":"build-2065373602"},"reference-count":78,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2006,11,6]],"date-time":"2006-11-06T00:00:00Z","timestamp":1162771200000},"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":[[2007,1,22]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The reaction of [{(C<jats:sub>5<\/jats:sub>Me<jats:sub>5<\/jats:sub>)CrCl<jats:sub>2<\/jats:sub>}<jats:sub>2<\/jats:sub>] with [2.2](1,4)cyclophane gave [(C<jats:sub>5<\/jats:sub>Me<jats:sub>5<\/jats:sub>)Cr{[2.2](1,4)cyclophane}] (<jats:bold>1<\/jats:bold>) and [(C<jats:sub>5<\/jats:sub>Me<jats:sub>5<\/jats:sub>)Cr{[2.2](1,4)cyclophane}Cr(C<jats:sub>5<\/jats:sub>Me<jats:sub>5<\/jats:sub>)] (<jats:bold>2<\/jats:bold>), depending on the reaction conditions. X\u2010ray structure analysis showed <jats:bold>2<\/jats:bold> to be a ministack which in turn is stacked in the lattice. The chromium atoms are 6.035\u2005\u00c5 apart, and the distortion of the benzene rings to boat\u2010shaped moieties is less pronounced than in parent [2.2](1,4)cyclophane. The NMR and EPR spectra were consistent with a <jats:italic>S<\/jats:italic>=1\/2 ground state for <jats:bold>1<\/jats:bold> and with two interacting <jats:italic>S<\/jats:italic>=1\/2 centers in <jats:bold>2<\/jats:bold>. Spin density was found in the ligand \u03c0 systems, where its sign was negative when the \u03c0 system was adjacent to chromium, while on the nonbonded benzene moiety of <jats:bold>1<\/jats:bold> it was positive. Cyclic voltammograms showed reductions to <jats:bold>1<\/jats:bold><jats:sup>\u2212<\/jats:sup> and <jats:bold>2<\/jats:bold><jats:sup>2\u2212<\/jats:sup>, as well as oxidations to <jats:bold>1<\/jats:bold><jats:sup>+<\/jats:sup>, <jats:bold>2<\/jats:bold><jats:sup>+<\/jats:sup>, and <jats:bold>2<\/jats:bold><jats:sup>2+<\/jats:sup> which were quasireversible, whereas oxidations to <jats:bold>1<\/jats:bold><jats:sup>2+<\/jats:sup> and <jats:bold>2<\/jats:bold><jats:sup>3+<\/jats:sup> were irreversible. Interaction between the metal ions was revealed by a 260\u2005mV separation of the redox waves belonging to <jats:bold>2<\/jats:bold><jats:sup>+<\/jats:sup>, and <jats:bold>2<\/jats:bold><jats:sup>2+<\/jats:sup>. Both cations were isolated as [B(C<jats:sub>6<\/jats:sub>H<jats:sub>5<\/jats:sub>)<jats:sub>4<\/jats:sub>]<jats:sup>\u2212<\/jats:sup> salts, which in solution decomposed to [2.2](1,4)cyclophane and [(C<jats:sub>5<\/jats:sub>Me<jats:sub>5<\/jats:sub>)Cr{(\u03b7<jats:sup>6<\/jats:sup>\u2010C<jats:sub>6<\/jats:sub>H<jats:sub>5<\/jats:sub>)B(C<jats:sub>6<\/jats:sub>H<jats:sub>5<\/jats:sub>)<jats:sub>3<\/jats:sub>}] (<jats:bold>3<\/jats:bold>). The <jats:sup>1<\/jats:sup>H and <jats:sup>13<\/jats:sup>C\u2005NMR spectra of <jats:bold>3<\/jats:bold> were in accordance with an <jats:italic>S<\/jats:italic>=1 ground state. Solid\u2010state magnetic measurements of the dimetallic compounds showed antiferromagnetic interaction with <jats:italic>J<\/jats:italic>=\u2212122\u2005cm<jats:sup>\u22121<\/jats:sup> for <jats:bold>2<\/jats:bold>, <jats:italic>J<\/jats:italic>=\u221231\u2005cm<jats:sup>\u22121<\/jats:sup> for <jats:bold>2<\/jats:bold><jats:sup>+<\/jats:sup> (ground state <jats:italic>S<\/jats:italic>=1\/2), and <jats:italic>J<\/jats:italic>=\u221223.5\u2005cm<jats:sup>\u22121<\/jats:sup> for <jats:bold>2<\/jats:bold><jats:sup>2+<\/jats:sup> (with <jats:italic>H<\/jats:italic>=\u2212<jats:italic>JS<\/jats:italic><jats:sub>1<\/jats:sub><jats:italic>S<\/jats:italic><jats:sub>2<\/jats:sub>). The decrease of <jats:italic>J<\/jats:italic> in the series <jats:bold>2<\/jats:bold>, <jats:bold>2<\/jats:bold><jats:sup>+<\/jats:sup>, and <jats:bold>2<\/jats:bold><jats:sup>2+<\/jats:sup> was traced to the number of unpaired electrons and, for the mixed\u2010valent cation <jats:bold>2<\/jats:bold><jats:sup>+<\/jats:sup>, to additional double exchange.<\/jats:p>","DOI":"10.1002\/chem.200600717","type":"journal-article","created":{"date-parts":[[2006,11,6]],"date-time":"2006-11-06T07:20:35Z","timestamp":1162797635000},"page":"1191-1200","source":"Crossref","is-referenced-by-count":11,"title":["Magnetic Face\u2010to\u2010Face Interaction and Electrocommunication in Chromium Sandwich Compounds"],"prefix":"10.1002","volume":"13","author":[{"given":"Christoph","family":"Elschenbroich","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Basil","family":"Kanellakopulos","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frank\u2005H.","family":"K\u00f6hler","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bernhard","family":"Metz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rodrigue","family":"Lescou\u00ebzec","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Norbert\u2005W.","family":"Mitzel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Werner","family":"Strau\u00df","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2007,1,9]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/0038-1098(73)90127-0"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00784a066"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1107\/S0567740877003793"},{"key":"e_1_2_6_5_2","unstructured":"\u00a0"},{"key":"e_1_2_6_6_2","first-page":"225","volume":"25","author":"Krogmann K.","year":"1977","journal-title":"NATO Advanced Study Institute Series B: Physics"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0898-8838(08)60095-1"},{"key":"e_1_2_6_8_2","unstructured":"\u00a0"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.19901020806"},{"key":"e_1_2_6_9_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.199008571"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1007\/3-540-52899-7_2"},{"key":"e_1_2_6_11_2","unstructured":"\u00a0"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1021\/om00124a001"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-93351-6_1"},{"key":"e_1_2_6_14_2","unstructured":"\u00a0"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr00083a010"},{"key":"e_1_2_6_16_2","doi-asserted-by":"publisher","DOI":"10.1021\/ic000540x"},{"key":"e_1_2_6_17_2","doi-asserted-by":"publisher","DOI":"10.1107\/S0365110X57001826"},{"key":"e_1_2_6_18_2","doi-asserted-by":"publisher","DOI":"10.1515\/znb-1978-0508"},{"key":"e_1_2_6_19_2","doi-asserted-by":"publisher","DOI":"10.1039\/C39950002393"},{"key":"e_1_2_6_20_2","unstructured":"\u00a0"},{"key":"e_1_2_6_21_2","doi-asserted-by":"publisher","DOI":"10.1002\/adma.19940060215"},{"key":"e_1_2_6_22_2","doi-asserted-by":"publisher","DOI":"10.1021\/om0010161"},{"key":"e_1_2_6_23_2","doi-asserted-by":"publisher","DOI":"10.1021\/om020520y"},{"key":"e_1_2_6_24_2","doi-asserted-by":"publisher","DOI":"10.1002\/cber.19911241103"},{"key":"e_1_2_6_25_2","doi-asserted-by":"publisher","DOI":"10.1007\/BFb0025267"},{"key":"e_1_2_6_26_2","doi-asserted-by":"publisher","DOI":"10.1002\/3527603964"},{"key":"e_1_2_6_27_2","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1515\/znb-1958-0316","volume":"13","author":"Fischer E. 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