6-Methoxy-(8-p-toluenesulfonamido)quinoline (TSQ) is one of the most efficient fluorescent stains for zinc(II). It was introduced by Soviet biochemists Toroptsev and Eshchenko in the early 1970s. The popularity of TSQ as physiological stain rose after seminal works by Christopher Frederickson two decades later. TSQ forms a 2:1 (ligand-metal) complex with zinc and emits blue light upon excitation at 365 nanometers. TSQ has been extensively applied for determination of extracellular or intracellular levels of Zn2+ in biological systems, also to study Zn2+ in mossy fibers of the hippocampus.

CAS：109628-27-5
中文别名：
英文别名：TSQ-6N;TS-Q;
分子式：C17H16N2O3S
分子量：328.386
精确质量：328.088
Psa：76.67
Logp：4.5064

UNII：7SWW052N6R

密度：1.334g/cm3
沸点：518.8ºC at 760mmHg
闪点：267.5ºC
折射率：1.654
蒸汽压：7.27E-11mmHg at 25°C