TY - JOUR
T1 - Enhancement of the photofunction of phosphorescent Pt(II) cyclometalated complexes driven by substituents
T2 - Solid-state luminescence and circularly polarized luminescence
AU - Usuki, Tsukasa
AU - Uchida, Hikaru
AU - Omoto, Kenichiro
AU - Yamanoi, Yoshinori
AU - Yamada, Ayano
AU - Iwamura, Munetaka
AU - Nozaki, Koichi
AU - Nishihara, Hiroshi
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/9/6
Y1 - 2019/9/6
N2 - Ligand functionalization is an attractive strategy for enhancing the performance of metal-based phosphorescent emitters. Here, we report the synthesis and characterization of cyclometalated Pt(II) complexes Pt3 and Pt4 containing organosilyl-substituted (2-(2-thienyl)pyridine) ligands and compare their properties with those of Pt1 (no substituent) and Pt2 (organocarbon substituent). The photophysical characteristics of these molecules, including their absorption and phosphorescence spectra, phosphorescence quantum yield and lifetime, were investigated. The molecular structures were revealed by X-ray diffraction analysis. Under UV light irradiation, Pt2-Pt4 emitted intense orange phosphorescence in the solid state because of the bulkiness of their side chains (up to φP: 0.49). Optically pure (-)-(S)Si-Pt4 and (+)-(R)Si-Pt4 were prepared using the optically active ligands (+)-L4 and (-)-L4, respectively. The chiroptical properties of (+)-(R)Si-Pt4, which has an asymmetric silicon atom, were investigated. Circular dichroism and circularly polarized luminescence measurements showed that these structural motifs are suitable for applications in chiroptical phosphorescent materials.
AB - Ligand functionalization is an attractive strategy for enhancing the performance of metal-based phosphorescent emitters. Here, we report the synthesis and characterization of cyclometalated Pt(II) complexes Pt3 and Pt4 containing organosilyl-substituted (2-(2-thienyl)pyridine) ligands and compare their properties with those of Pt1 (no substituent) and Pt2 (organocarbon substituent). The photophysical characteristics of these molecules, including their absorption and phosphorescence spectra, phosphorescence quantum yield and lifetime, were investigated. The molecular structures were revealed by X-ray diffraction analysis. Under UV light irradiation, Pt2-Pt4 emitted intense orange phosphorescence in the solid state because of the bulkiness of their side chains (up to φP: 0.49). Optically pure (-)-(S)Si-Pt4 and (+)-(R)Si-Pt4 were prepared using the optically active ligands (+)-L4 and (-)-L4, respectively. The chiroptical properties of (+)-(R)Si-Pt4, which has an asymmetric silicon atom, were investigated. Circular dichroism and circularly polarized luminescence measurements showed that these structural motifs are suitable for applications in chiroptical phosphorescent materials.
UR - http://www.scopus.com/inward/record.url?scp=85071996894&partnerID=8YFLogxK
U2 - 10.1021/acs.joc.9b01285
DO - 10.1021/acs.joc.9b01285
M3 - 学術論文
C2 - 31366198
AN - SCOPUS:85071996894
SN - 0022-3263
VL - 84
SP - 10749
EP - 10756
JO - Journal of Organic Chemistry
JF - Journal of Organic Chemistry
IS - 17
ER -