P4125

Patent Blue Violet (Patent Blue)

practical grade

• Synonym(s): Ethanaminium, N-[4-[[4-(diethylamino)phenyl](2,5-disulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-N-ethyl-, inner salt, sodium salt lymphazurin, Isosulfan Blue
• Linear Formula: C₂₇H₃₁N₂O₆S₂Na
• CAS Number: 68238-36-8
• Molecular Weight: 566.66
• MDL number: MFCD00012119
• UNSPSC Code: 12171500

Properties

• grade: practical grade
• composition: Dye content, ~50%
• mp: 260 °C (dec.)
• SMILES string: [Na+].CCN(CC)c1ccc(cc1)\C(=C2/C=CC(\C=C2)=[N+](\CC)CC)c3ccc(cc3S([O-])(=O)=O)S([O-])(=O)=O

Description

Other Notes

Literature for Patent Blue Violet discusses two dyes which are very similar, Color Index Numbers 42045 and 42051. Structurally they differ with regard to the substituents on one of the aromatic rings. C.I. 42045 is 2,4-disulfo-substituted while C.I. 42051 is 2,4-disulfo-5-hydroxy-substituted.
Our NMR studies show that P 1888 and P 4125 are neither, but are instead 2,5-disulfo-substituted dyes. As yet no C.I. No. or common name has been established for this dye. We will continue to list P 1888 and P 4125 as Patent Blue Violet until the distinction has been clarified.