Iridium complexes containing N-donor-functionalized η¹-fluorenyl ligands

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• 作者：Fioralba Taullaj^a ; David Armstrong^a ; Alan J. Lough^b ; Ulrich Fekl^a ; ^{ulrich.fekl@utoronto.ca" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Constrained geometry ; Fluorenyl ; Nitrogen donor ; Late metal ; Hydrogenation
• 刊名：Polyhedron
• 出版年：2016
• 出版时间：29 March 2016
• 年：2016
• 卷：108
• 期：Complete
• 页码：30-35
• 全文大小：989 K

文摘

Iridium complexes of two different nitrogen-donor-functionalized fluorenyl ligands have been synthesized and characterized, L¹Ir(COD) and L²Ir(COD), where L¹⁻ = [9-(2-dimethylamino)ethyl]fluorenyl anion, L²⁻ = [9-(2-ortho-pyridyl)ethyl]fluorenyl anion, and COD = 1,5-cyclooctadiene. The structures of both ligands (in their protonated form) and of both complexes were determined by single-crystal X-ray crystallography. Structural consequences of the nature of the nitrogen ligand (dimethylamino substituent versus ortho-pyridyl substituent) are significantly different Ir–N distances (shorter for L²Ir(COD)) and indirect cis-influence on the COD ligand resulting in a shorter Ir–olefin bond cis to the nitrogen donor in L²Ir(COD). Both complexes act as precatalysts for arene hydrogenation.