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These complexes were unambiguously characterized by X-ray analysis. In dichloromethane solvent, complex 4 undergoes a unique square-planar to square-planar rotation around the nickel(II) center, for which activation parameters of \u0394H\u29e7 = 12.2(1) kcal mol\u20131 and \u0394S\u29e7 = 0.8(5) eu were measured via NMR inversion recovery experiments. Complex 4 was also observed to isomerize via a relatively slow ring flip: \u0394H\u29e7 = 15.0(2) kcal mol\u20131; and \u0394S\u29e7 = \u22124.2(7) eu. DFT studies support the experimentally measured rotation activation energy (cf. calculated \u0394H\u29e7 = 11.1 kcal mol\u20131) as well as the presence of a high-energy triplet intermediate (\u0394H = 8.8 kcal mol\u20131).<\/jats:p>","DOI":"10.1021\/om500173j","type":"journal-article","created":{"date-parts":[[2014,4,7]],"date-time":"2014-04-07T15:05:51Z","timestamp":1396883151000},"page":"2019-2026","source":"Crossref","is-referenced-by-count":14,"title":["Synthesis and Characterization\nof Dimethylbis(2-pyridyl)borate\nNickel(II) Complexes: Unimolecular Square-Planar to Square-Planar\nRotation around Nickel(II)"],"prefix":"10.1021","volume":"33","author":[{"given":"Jeff A.","family":"Celaje","sequence":"first","affiliation":[{"name":"University of Southern California , , , , ,","place":["Los Angeles, California, United States, 90089-1661"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Megan K.","family":"Pennington-Boggio","sequence":"additional","affiliation":[{"name":"University of Southern California , , , , ,","place":["Los Angeles, California, United States, 90089-1661"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robinson W.","family":"Flaig","sequence":"additional","affiliation":[{"name":"University of Southern California , , , , ,","place":["Los Angeles, California, United States, 90089-1661"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael G.","family":"Richmond","sequence":"additional","affiliation":[{"name":"University of North Texas , , , , ,","place":["Denton, Texas, United States, 76203-5017"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Travis J.","family":"Williams","sequence":"additional","affiliation":[{"name":"University of Southern California , , , , ,","place":["Los Angeles, California, United States, 90089-1661"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2014,4,7]]},"reference":[{"key":"2026090405203152100_cit1a","doi-asserted-by":"crossref","first-page":"615","DOI":"10.1016\/B978-008046518-0.00116-1","article-title":"Nickel-Catalyzed Oligomerization of Alkenes and Related Reactions","volume-title":"Comprehensive Organometallic Chemistry","author":"Jolly","year":"1982"},{"key":"2026090405203152100_cit1b","volume-title":"The Organic Chemistry\nof Nickel","author":"Jolly","year":"1974"},{"key":"2026090405203152100_cit1c","first-page":"29","volume-title":"Advances in Organometallic Chemistry","author":"Heimbach","year":"1970"},{"key":"2026090405203152100_cit1d","doi-asserted-by":"crossref","first-page":"1931","DOI":"10.1039\/jr9540001931","author":"Reed","year":"1954","journal-title":"J. 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