TY - JOUR
T1 - Neutral Luminescent Bis(bipyridyl) Osmium(II) Complexes with Improved Phosphorescent Properties
AU - Chu, Wing-Kin
AU - Yiu, Shek-Man
AU - Ko, Chi-Chiu
PY - 2014/12/8
Y1 - 2014/12/8
N2 - A new class of neutral bis(isocyanoborato) bis(bipyridyl) Os(II) complexes with the general formula of [Os(N-N)2(CNBR3)2] (N-N = bpy, 4,4'-Me2bpy; R = C6F5, C6H5) were prepared with simple synthetic methodologies. One of these complexes was structurally characterized by X-ray crystallography. Unlike most of the neutral bis(bipyridyl) Os(II) complexes, which are very weakly emissive or nonemissive, these isocyanoborato complexes displayed intense orange to red phosphorescence with a luminescent quantum yield up to 0.09 in CH2Cl2 solution at room temperature. The photophysical and electrochemical properties of these complexes were also investigated. Detailed photophysical study showed that these complexes exhibited significantly enhanced emission properties over other reported neutral bis(bipyridyl) Os(II) complexes. In addition, it also revealed that the photophysics, electrochemistry, and excited state properties can be fine-tuned or modified through the functionalization of isocyanoborate ligands.
AB - A new class of neutral bis(isocyanoborato) bis(bipyridyl) Os(II) complexes with the general formula of [Os(N-N)2(CNBR3)2] (N-N = bpy, 4,4'-Me2bpy; R = C6F5, C6H5) were prepared with simple synthetic methodologies. One of these complexes was structurally characterized by X-ray crystallography. Unlike most of the neutral bis(bipyridyl) Os(II) complexes, which are very weakly emissive or nonemissive, these isocyanoborato complexes displayed intense orange to red phosphorescence with a luminescent quantum yield up to 0.09 in CH2Cl2 solution at room temperature. The photophysical and electrochemical properties of these complexes were also investigated. Detailed photophysical study showed that these complexes exhibited significantly enhanced emission properties over other reported neutral bis(bipyridyl) Os(II) complexes. In addition, it also revealed that the photophysics, electrochemistry, and excited state properties can be fine-tuned or modified through the functionalization of isocyanoborate ligands.
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U2 - 10.1021/om500630c
DO - 10.1021/om500630c
M3 - RGC 21 - Publication in refereed journal
SN - 0276-7333
VL - 33
SP - 6771
EP - 6777
JO - Organometallics
JF - Organometallics
IS - 23
ER -