DiI 是一种亲脂性膜染料，通常用作神经元和其它细胞的长期示踪剂。它在进入细胞膜之前荧光非常弱，仅当进入到细胞膜后才可以被激发出很强的橙红色荧光 (λex=549 nm，λem=565 nm)。

DiI is a lipophilic membrane dye. It diffuses laterally to stain the entire cell. DiI is excited to emit orange-red fluorescence which is weak in water but strong and photostable when incorporated into membranes.

41085-99-8

C59H97ClN2O4

933.87

DiIC18(3);DiI

DMSO:12.5 mg/mL (13.39 mM),ultrasonic and warming and heat to 80°C
Powder: -20°C for 3 years
In solvent: -80°C for 2 years