CA Index Name: Methanaminium, N-[4-[[4-(dimethy-lamino)phenyl]phenylmethylene]-2,5-cyclohexadien-1-ylidene]-N-methyl-, ethanedioate, ethanedioate (2:2:1)
Other Names: Ammonium, [4-[p-(dimethylamino)-a-phenylbenzylidene]-2,5-cyclohexadien-1-ylidene]di-methyl, oxalate (1:1), oxalate (1:1); Malachite green oxalate; Ethanedioic acid, ion(1-), N-[4-[[4-(dimethyla-mino)phenyl]phenylmethylene]-2,5-cyclohexadien-1-ylidene]-N-methylmethanaminium, ethanedioate (2:1); Malachite green oxalate salt
Merck Index Number: 5699
Chemical / Dye Class: Triphenylmethane
Molecular Formula: C52H54N4O12
Molecular Weight: 927.00
Physical Form: Green crystals or powder
Solubility: Soluble in water, ethanol; insoluble in xylene
Melting Point: 164 °C (decompose)
pH Range: 0.0-2.0; 11.6-14.0
Color Change at pH: Yellow (0.0) to green (2.0); green (11.6) to colorless (14.0)
pKa: 6.90
Absorption (λmax): 614 nm, 425 nm
Synthesis: Synthetic methods
Staining Applications: Brain; spinal cord; phosphohydrolase
Biological Applications: Detecting bacterial growth; treating fish diseases, malignant neoplasm
Industrial Applications: Inks; toners; photoresists; printing plates; photosensitive resins; recording materials; printed circuit boards; solar cells; photoelectrographic materials; laser dyes; NLO dyes; textiles
Safety / Toxicity: Cytotoxicity; developmental abnormalities; estrogenicity
Certification / Approval: Certified by Biological Stain Commission (BSC)