5-(&6)-Carboxy-2', 7'-Dichlorofluorescein 200mg

5-(and-6)-carboxy-2',7'-dichlorofluorescein is similar to carboxyfluorescein, but has lower pK_a. It is useful for detecting pH in more acidic environment. Also see the membrane-permeant compound dichlorofluorescein diacetate. 

 
• pK_a = 4.8 
• &lamba;_Ex/&lamba;_Em = 504/529 nm 
• ε= 90,000 
• Orange solid soluble in DMSO and pH>6 buffers 
• Store at room temperature and protect from light, especially in solution 
• C₂₁H₁₀Cl₂O₇ 
• MW: 445 
• [111843-78-8]