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Distinguished by their robustness and nucleophilicity, they have promise as alternatives to tris(pyrazolyl)borates in coordination chemistry, materials applications, and catalysis. In this article, bis[phenyltris(pyridin-2-yl)borato]cobalt(III) tetracarbonylcobalt(\u2013I) dichloromethane monosolvate, [Co(C\n                    <jats:sub>21<\/jats:sub>\n                    H\n                    <jats:sub>17<\/jats:sub>\n                    BN\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    ][Co(CO)\n                    <jats:sub>4<\/jats:sub>\n                    ]\u00b7CH\n                    <jats:sub>2<\/jats:sub>\n                    Cl\n                    <jats:sub>2<\/jats:sub>\n                    or [Tpy\n                    <jats:sub>2<\/jats:sub>\n                    Co][Co(CO)\n                    <jats:sub>4<\/jats:sub>\n                    ]\u00b7CH\n                    <jats:sub>2<\/jats:sub>\n                    Cl\n                    <jats:sub>2<\/jats:sub>\n                    , was prepared by the reaction of hydrogen phenyltris(pyridin-2-yl)borate (TpyH), triethylamine, and Co(CO)\n                    <jats:sub>4<\/jats:sub>\n                    I. Single-crystal X-ray diffraction resulted in a homoleptic complex consisting of the diamagnetic [Tpy\n                    <jats:sub>2<\/jats:sub>\n                    Co]\n                    <jats:sup>+<\/jats:sup>\n                    cation and the tetracarbonylcobaltate {[Co(CO)\n                    <jats:sub>4<\/jats:sub>\n                    ]\n                    <jats:sup>\u2212<\/jats:sup>\n                    } counter-ion. The unusual Co\n                    <jats:sup>III<\/jats:sup>\n                    \/Co\n                    <jats:sup>\u2014I<\/jats:sup>\n                    mixed-valence composition presumably results from disproportionation. [Tpy\n                    <jats:sub>2<\/jats:sub>\n                    Co][Co(CO)\n                    <jats:sub>4<\/jats:sub>\n                    ] represents the first mixed-valence tris(pyridin-2-yl)borate complex.\n                  <\/jats:p>","DOI":"10.1107\/s2056989026004093","type":"journal-article","created":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T07:06:31Z","timestamp":1777446391000},"page":"712-716","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["[Tpy\n                    <sub>2<\/sub>\n                    Co][Co(CO)\n                    <sub>4<\/sub>\n                    ]: a mixed-valent cobalt(III)\/cobalt(\u2212I) complex based on phenyltris(pyridin-2-yl)borate (Tpy\n                    <sup>\u2212<\/sup>\n                    )"],"prefix":"10.1107","volume":"82","author":[{"given":"Oshani","family":"Wijesinghe","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/048sx0r50","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert Joseph","family":"Comito","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/048sx0r50","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2026,5,22]]},"reference":[{"key":"jy2070_bb1","doi-asserted-by":"crossref","first-page":"4455","DOI":"10.1021\/om800416j","volume":"27","author":"Abernethy","year":"2008","journal-title":"Organometallics"},{"key":"jy2070_bb2","doi-asserted-by":"crossref","first-page":"3480","DOI":"10.1002\/ejic.201100281","volume":"2011","author":"Adamczyk","year":"2011","journal-title":"Eur. 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