Tuning Photophysical and Electrochemical Properties of Cationic Iridium(III) Complex Salts with Imidazolyl Substituents by Proton and Anions

A series of cationic iridium(III) complex salts, 1−5, were synthesized containing different phenanthroline
derivatives. Their photophysical and electrochemical properties were investigated. The influences of anions
and proton on the photophysical and electrochemical properties were also studied in detail. Upon addition
of CF3COOH, the emission wavelength was significantly red-shifted and the emission color changed
from yellow to red. In addition, the addition of F-, CH3COO-, and H2PO4- can also cause significant
variations in UV−vis absorption and emission spectra. Upon addition of F-, CH3COO-, and H2PO4-,
the solution colors of 1−3 changed from yellow-green to brown and the emission of 1−3 was quenched
completely, which can be observed by the naked eye.

一系列阳离子铱(III)配合盐1-5，其中含有不同的苯并芘衍生物，已被合成。对其光物理和电化学性质进行了详细研究。对阴离子和质子对光物理和电化学性质的影响也进行了深入探讨。加入CF3COOH后，发射波长显著红移，发射颜色从黄色转变为红色。此外，加入F-、CH3COO-和H2PO4-也能引起紫外-可见吸收和发射光谱的显著变化。加入F-、CH3COO-和H2PO4-后，1-3的溶液颜色从黄绿色变为棕色，1-3的发射完全淬灭，这一现象可通过肉眼观察到。