TY - JOUR
T1 - Highly Selective Aluminum(III) Ion Sensing with Luminescent Iridium(III) Complexes Bearing a Distorted 2,2′-Bipyridine-3,3′-diol Moiety Utilizing a Rigidified Seven-Membered Chelate Ring
AU - Suzuki, Yota
AU - Mizuno, Ibuki
AU - Tabei, Yui
AU - Fujioka, Yuri
AU - Shinozaki, Kazuteru
AU - Sugaya, Tomoaki
AU - Ishihara, Koji
N1 - Funding Information:
Financial support was provided by JSPS KAKENHI under Grant Number 17K05910. We acknowledge Assoc. Prof. Takashi Fujihara and Dr. Keiji Ohno at Saitama University for single-crystal X-ray structure analyses and NMR spectroscopy, and the staff of the Materials Characterization Central Laboratory of Waseda University for acquiring the ESI mass spectra and elemental analyses. We would like to thank Editage ( www.editage.jp ) for English language editing.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/8/5
Y1 - 2019/8/5
N2 - To create an ion sensor utilizing a rigidified seven-membered chelate ring, we developed two Ir(III) complexes with 2,2′-bipyridine-3,3′-diol (bpy(OH)2, bpydL) ligands as reaction centers, namely Ir1 ([Ir(ppy)2{bpy(O-)(OH)}], ppy = 2-phenylpyridine) and Ir2 ([Ir(bzq)2{bpy(O-)(OH)}], bzq = benzo[h]quinoline), and evaluated their reactivities toward metal ions by spectrophotometry. When they are reacted with Al3+, these complexes exhibit dramatic enhancements in emission intensity (775-fold for Ir1 and 51.0-fold for Ir2) and distinct orange to green changes in emission color. The reactions of Ir1 and Ir2 with Al3+ were found to barely be affected by nearly all common metal ions. We conclude that these high selectivities arise from the high affinities of the (O,O) atoms in bpydL for hard metal ions and the increased strain of the seven-membered chelate ring due to the coordination of bpydL to the Ir(III) center in each complex, which excludes large metal ions out of the chelate ring.
AB - To create an ion sensor utilizing a rigidified seven-membered chelate ring, we developed two Ir(III) complexes with 2,2′-bipyridine-3,3′-diol (bpy(OH)2, bpydL) ligands as reaction centers, namely Ir1 ([Ir(ppy)2{bpy(O-)(OH)}], ppy = 2-phenylpyridine) and Ir2 ([Ir(bzq)2{bpy(O-)(OH)}], bzq = benzo[h]quinoline), and evaluated their reactivities toward metal ions by spectrophotometry. When they are reacted with Al3+, these complexes exhibit dramatic enhancements in emission intensity (775-fold for Ir1 and 51.0-fold for Ir2) and distinct orange to green changes in emission color. The reactions of Ir1 and Ir2 with Al3+ were found to barely be affected by nearly all common metal ions. We conclude that these high selectivities arise from the high affinities of the (O,O) atoms in bpydL for hard metal ions and the increased strain of the seven-membered chelate ring due to the coordination of bpydL to the Ir(III) center in each complex, which excludes large metal ions out of the chelate ring.
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U2 - 10.1021/acs.inorgchem.9b00373
DO - 10.1021/acs.inorgchem.9b00373
M3 - Article
C2 - 31328918
AN - SCOPUS:85070918712
VL - 58
SP - 9663
EP - 9671
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 15
ER -