o-Carboranyl鈥揚hosphine as a New Class of Strong-Field Ancillary Ligand in Cyclometalated Iridium(III) Complexes: Toward Blue Phosphorescence

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• 作者：Taewon Kim ; Junseong Lee ; Sang Uck Lee ; Min Hyung Lee
• 刊名：Organometallics
• 出版年：2015
• 出版时间：July 27, 2015
• 年：2015
• 卷：34
• 期：14
• 页码：3455-3458
• 全文大小：328K
• ISSN：1520-6041

文摘

Heteroleptic tris-cyclometalated Ir(III) complexes supported by the o-carboranyl鈥損hosphine ligand (CBP), (C^{鈭?/sup>N)₂Ir(CBP) (C鈭?/sup>N = ppy (1), dfppy (2)), have been synthesized and characterized. The PL spectra of 1 and 2 displayed substantially blue shifted phosphorescence relative to the corresponding Ir(C鈭?/sup>N)₃ complexes. Electrochemical and theoretical studies showed that the CBP ligand functioned as a strong-field ancillary ligand, and the greater HOMO stabilization in comparison to that of the LUMO by the CBP ligand was responsible for the increase in band gap, leading to a large blue shift in phosphorescence.}