Authentic-Blue Phosphorescent Iridium(III) Complexes Bearing Both Hydride and Benzyl Diphenylphosphine; Control of the Emission Efficiency by Ligand Coordination Geometry | Zendy

Yuan-Chieh Chiu | Zendy; Chen-Huey Lin | Zendy; JuiYi Hung | Zendy; Yün Chi | Zendy; YiMing Cheng | Zendy; Kangwei Wang | Zendy; MinWen Chung | Zendy; GeneHsiang Lee | Zendy; PiTai Chou | Zendy

Open Access

Authentic-Blue Phosphorescent Iridium(III) Complexes Bearing Both Hydride and Benzyl Diphenylphosphine; Control of the Emission Efficiency by Ligand Coordination Geometry

Author(s) -

Yuan-Chieh Chiu,

Chen-Huey Lin,

JuiYi Hung,

Yün Chi,

YiMing Cheng,

Kangwei Wang,

MinWen Chung,

GeneHsiang Lee,

PiTai Chou

Publication year - 2009

Publication title -

inorganic chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.348

H-Index - 233

eISSN - 1520-510X

pISSN - 0020-1669

DOI - 10.1021/ic900607s

Subject(s) - chemistry , iridium , phosphorescence , diphenylphosphine , hydride , ligand (biochemistry) , bearing (navigation) , photochemistry , coordination geometry , phosphine , molecule , catalysis , organic chemistry , metal , biochemistry , physics , receptor , quantum mechanics , fluorescence , cartography , hydrogen bond , geography

Sequential treatment of IrCl(3) x nH(2)O with 2 equiv of benzyl diphenylphosphine (bdpH) and then 1 equiv of 3-trifluoromethyl-5-(2-pyridyl) pyrazole (fppzH) in 2-methoxyethanol gave formation to three isomeric complexes with formula [Ir(bdp)(fppz)(bdpH)H] (1-3). Their molecular structures were established by single crystal X-ray diffraction studies, showing existence of one monodentate phosphine bdpH, one terminal hydride, a cyclometalated bdp chelate, and a fppz chelate. Variation of the metal-ligand bond distances showed good agreement with those predicted by the trans effect. Raman spectroscopic analyses and the corresponding photophysical data are also recorded and compared. Among all isomers complex 1 showed the worst emission efficiency, while complexes 2 and 3 exhibited the greatest luminescent efficiency in solid state and in degassed CH(2)Cl(2) solution at room temperature, respectively. This structural relationship could be due to the simultaneously weakened hydride and the monodentate bdpH bonding that are destabilized by the trans-pyrazolate anion and cyclometalated benzyl group, respectively.

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