Methine Dyes and Pigments

Synthesis of aminyl biradicals by base-induced Csp3–Csp3 coupling of cationic azo dyes

“…Azoimidazolium salts are industrially important dyes, which are used for the dying of synthetic and natural fibres 13. We have recently reported a new route for preparing these dyes 14.…”

Two-Photon and Deep-Red Emission Ratiometric Fluorescent Probe with a Large Emission Shift and Signal Ratios for Sulfur Dioxide: Ultrafast Response and Applications in Living Cells, Brain Tissues, and Zebrafishes

“…However, these methods require complicated operation and need destructive samples, although they offer high sensitivity and selectivity to sulfur dioxide. On the other hand, fluorescence imaging is one of the most attractive techniques due to its advantages in terms of real-time detection, convenient sample preparation, and spatial resolution. − So far, a number of fluorescent probes for the detection of sulfite (or bisulfite) have been reported. − Nevertheless, several challenges for detecting sulfur dioxide still exist. First, most of the probes are usually excited by one-photon (OP) and short emission wavelengths (<600 nm), possessing shallow penetration compared with two-photon (TP) and deep-red emission modes, which may limit their further applications in living biological systems.…”

Neutral Aminyl Radicals Derived from Azoimidazolium Dyes

“…Cationic azo dyes containing imidazolium groups are produced industrially and used for a variety of applications including the dying of natural and synthetic fibers . Despite the technical importance of azoimidazolium dyes, there are relatively few reports about these compounds in the scientific literature.…”