Molecular Weight 319.85222 [g/mol]
Molecular Formula C16H18ClN3S
γmax 670 nm
Odor Slight odor
Melting point 105°C (decomposes)
Commercial name Methylene Blue, thiazine
Covalently-Bonded Unit Count 2
H-Bond Donor 0
H-Bond Acceptor 3
Water solutions deep blue
Solubility in water 43,600 mg/L at 25°C
pKa Less than 1
Table 1: Properties of Methylene Blue (MB).