This compound belongs to the class of organic compounds known as diphenylmethanes. These are compounds containing a diphenylmethane moiety, which consists of a methane wherein two hydrogen atoms are replaced by two phenyl groups.
External Descriptors
iminium ion
1. Djoumbou Feunang Y, Eisner R, Knox C, Chepelev L, Hastings J, Owen G, Fahy E, Steinbeck C, Subramanian S, Bolton E, Greiner R, and Wishart DS. ClassyFire: Automated Chemical Classification With A Comprehensive, Computable Taxonomy. Journal of Cheminformatics, 2016, 8:61.
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Application Protocols
The following are general, literature-based research protocols; they are not item-specific validations. Adjust concentrations and times to your system.
A. Stock solution preparation (spectroscopy)
Dissolve dye (salt form) in ethanol or water to prepare a 1.0 mM stock. Filter (0.22 µm) into an amber vial. Store at room temperature protected from light. For quantitative work, determine concentration by UV–Vis using ε ≈ 8.7×10^4 M−1 cm−1 at ~590 nm (literature; solvent-dependent).
B. Gram staining (research use only, microbiology)
Prepare crystal violet solution (e.g., 0.5–1% w/v in water or ethanol–water). Flood fixed bacterial smear for 60 s; rinse with water.
Add mordant: Gram’s iodine for 60 s; rinse.
Decolorize briefly with ethanol/acetone until runoff is nearly clear; rinse immediately.
Counterstain (e.g., safranin) 30–60 s; rinse and air-dry. Observe under oil immersion. Record all times/solutions for reproducibility.
C. Adsorption isotherm assay (materials)
Prepare a series of dye solutions (5–100 mg/L) in water (buffered near neutral).
Contact known masses/volumes of sorbent with dye solutions under constant agitation at 25 °C until equilibrium.
Filter/centrifuge and quantify residual dye by A590 nm. Fit data to Langmuir/Freundlich models.
Note: Colors and performance depend on solvent, pH, and counterion; perform small-scale tests before scaling.
Biological Roles
Scope and caveats
Gentian violet is a synthetic triarylmethane dye; it is not a native metabolite. The following describes research-use interactions and properties, not clinical effects or therapeutic uses.
Research-relevant interactions (literature)
Electrostatic binding: As a cationic chromophore, it associates with negatively charged biomatrices (e.g., peptidoglycan, extracellular polysaccharides, nucleic acids to a lesser extent), enhancing contrast in microscopic observations.
Hydrophobic/aromatic stacking: The triarylmethyl core can engage in π–π and hydrophobic interactions, leading to partitioning into lipidic or aromatic microenvironments, often with bathochromic spectral shifts.
Acid–base/leuco equilibria: In biological media containing amines, proteins, or elevated pH, the cation may convert to less colored leuco forms, altering staining intensity over time; fixation and mordanting steps mitigate loss.
Photophysical behavior: Strong visible absorption enables its use as a probe for local polarity and microviscosity through solvatochromic and aggregation-dependent spectral changes.
Practical notes
For reproducible staining intensity in research, maintain consistent ionic strength and pH, and consider mordants (e.g., iodide in Gram protocols) to form dye–substrate complexes less prone to extraction.
Spectral monitoring in cell-free systems can quantify binding or displacement from biomolecular targets; report temperature and medium composition to ensure comparability.
Buffer Applications
Not typically applicable.
Gentian violet cation is a dye, not a buffering agent. It does not define a useful conjugate acid/base pair for pH control in common laboratory buffers.
For work involving this dye, select a buffer appropriate to your biological or analytical system (e.g., phosphate, Tris, acetate) and verify that the buffer pH does not induce leuco formation or dye precipitation. Avoid strongly basic buffers if color retention is essential.
Green Alternatives
Environmental context (general)
Triarylmethane dyes such as gentian violet can be persistent and intensely colored in effluents. Consider greener choices or operational controls to reduce environmental load while meeting experimental goals.
Methylene blue: Visible-absorbing cationic dye with extensive toxicology data; readily photodegrades under light/oxygen. Pros: good aqueous solubility; Cons: different redox/staining profile.
Safranin O: Cationic dye used for staining plant tissues; often less persistent than triarylmethanes in some treatments. Pros: effective biological contrast; Cons: spectral shift vs gentian violet.
Brilliant blue FCF: Food-grade anionic dye; lower hazard classification in many jurisdictions. Pros: safer handling; Cons: anionic, not a direct substitute for cationic-binding studies.
Operational greener practices
Minimize volumes and prepare only the quantity needed; employ microvolume cuvettes for spectroscopic work.
Capture dye-containing wastes separately; treat with activated carbon or advanced oxidation prior to disposal per institutional guidance.
Prefer aqueous or ethanol–water media over high-boiling aprotics when feasible to reduce solvent impact.
Safranin O: λmax ~520–530 nm, useful for alternative counterstains with different selectivity.
Pharmaceutical Uses
Scope
No therapeutic claims are made. The following concerns only potential formulation and manufacturing roles in research and development contexts.
Research/formulation context (general)
Colorant in investigational ex vivo or in vitro preparations: The intense color can aid visual tracking of dosage forms, device coatings, or process streams during nonclinical development work.
Process tracer: Low-level additions serve as visual markers in mixing, coating uniformity checks, and cleaning validation studies (research scale), provided compatibility with materials of construction is established.
Considerations
Regulatory status: Gentian/crystal violet has complex regulatory considerations in food/drug contexts in many jurisdictions. For any development use, confirm current regulatory positions and impurity controls; avoid human/animal administration unless explicitly permitted by governing regulations.
Extractables/leachables: The cationic dye can adsorb to or desorb from plastics and elastomers; evaluate container–closure compatibility.
Purity/counterion: For formulation studies, ensure the salt form, residual solvents, inorganic ions, and dye content are defined on the CoA, as hue and stability depend on these parameters.
Physical Properties
Item-specific properties from Product Data
Appearance: Not specified for this item; refer to CoA/Spec Sheet.
Grade/Purity: Not specified for this item; refer to CoA/Spec Sheet.
Literature/typical values for the gentian (crystal) violet cation or its common chloride salt
Physical state (literature): Typically a deep violet crystalline solid (as chloride salt); intensely colored solutions in polar solvents.
Solubility (literature): Freely soluble in ethanol and methanol; soluble in water when present as a salt; solubility enhanced by acidification. The isolated cation requires a counterion for bulk solid handling.
UV–Vis (literature): Strong absorption in the visible, λmax ~585–600 nm in water/ethanol; ε ≈ 8.5×10^4–9.0×10^4 M−1 cm−1 depending on medium.
pKa (pertinent equilibrium, literature): The color/intensity depends on acid–base and leuco (carbinol) equilibria; hydroxide induces decolorization via carbinol formation.
Partitioning (literature): Cationic, highly polar; logP not meaningful without specifying counterion and medium; generally exhibits strong binding to negatively charged surfaces (silica, cellulose, biomatrices).
Notes for users
Do not treat literature values as specifications. Verify exact counterion, water content, and assay/purity on the item’s CoA prior to quantitative analytical work.
Optical properties are sensitive to solvent, ionic strength, and proton activity; record conditions when comparing spectra.
Quality and Grades
Item-specific details from Product Data
Grade/Purity: Not specified for this item; refer to CoA/Spec Sheet.
Stabilizers: Not specified for this item; refer to CoA/Spec Sheet.
Guidance for interpreting grades (general)
Dyes may be offered as biological stain grade, indicator grade, or analytical grade. Biological stain grades are typically controlled for dye content, shade, and performance in defined staining tests; analytical grades may specify low inorganic residue and defined counterion content.
For spectroscopic applications (e.g., kinetic standards), low inorganic/organic impurities and well-defined counterion content improve reproducibility of λmax and ε. Request UV–Vis trace and dye content (assay) if critical.
Counterion specification: The term “gentian violet cation” denotes the chromophore; in practice, materials are isolated as salts (e.g., chloride). Verify the counterion and any hydration/solvent of crystallization.
Stabilizers/anti-caking agents: Some commercial powders include small amounts of anti-caking silica or moisture. If such additives would interfere with your assay or surface-binding experiments, confirm their absence on the CoA.
Recommendations
For quantitative photophysical work, request lot-specific extinction coefficient (or determine in-house against a primary standard) under your solvent/ionic conditions.
For microbiology staining in research, select stain-grade material qualified in Gram stain controls, if available.
Reaction and Applications
Applicability
As a cationic, highly conjugated dye, gentian violet cation is primarily used in research as a biological stain, adsorption probe, and photophysical standard rather than as a typical organic reagent. It also participates in well-known kinetic and photoredox model reactions.
Representative research applications (literature)
Colorimetric/kinetic standard: The base-catalyzed decolorization of crystal violet by hydroxide (formation of a leuco carbinol) is a classic kinetics experiment; pseudo-first-order kinetics are often observed under large [OH−] excess.
Photoredox/photosensitization: The dye absorbs visible light and can photosensitize radical processes or undergo photooxidation/reduction in presence of electron donors/acceptors.
Adsorption and materials: Used as a probe to quantify adsorption capacities of clays, carbons, and polymeric sorbents via UV–Vis methods.
Biological staining (research use): Cationic dye binds to anionic biomatrices (e.g., bacterial cell walls in Gram procedures, fungal cell walls, and extracellular matrices) via electrostatic and hydrophobic interactions.
Practical tips
Prepare fresh solutions to minimize photobleaching and base-induced fading; store stocks in amber glass.
Filter working solutions (0.22–0.45 µm) to remove particulates that scatter light during spectrophotometry.
Record solvent composition, temperature, and pH; the molar absorptivity and spectral shape are medium-dependent.
For kinetic studies, maintain ionic strength with inert electrolyte and use thermostatted cuvettes for precise rate constants.
Reaction Conditions
General guidance (literature; not item-specific specifications)
Base-induced decolorization (kinetics model):
Solvent: Water or water–ethanol mixtures.
Conditions: 20–25 °C; [OH−] typically 10−4 to 10−2 M; dye concentration in the low µM range.
Observation: Decay of A590 nm monitored over time; pseudo-first-order rate constant kobs ~ k[OH−] under excess base.
Redox cycling:
Reductive leuco formation with sodium dithionite or ascorbate in buffered aqueous ethanol; reoxidation with dissolved oxygen or ferricyanide.
Monitor spectral shifts from violet (λmax ~590 nm) to colorless/weakly absorbing leuco form and back.
Photoredox experiments:
Light source: Green LEDs (≈520–535 nm) or broadband visible lamps; avoid overheating.
Solvents: MeOH, EtOH, ACN, or aqueous buffer with electron donor/acceptor present.
Oxygen level: Control aeration (argon vs air) to tune pathways (photooxidation vs photoreduction).
Operational tips
Use amber glassware or wrap vessels in foil to limit photobleaching during non-photochemical experiments.
Filter working solutions to avoid light scattering in kinetic traces.
Maintain ionic strength (e.g., 0.1 M NaClO4) for reproducible rate constants in aqueous media.
Always report solvent composition, temperature, ionic strength, and wavelength used for monitoring.
Safety and Handling
Item-specific hazard data from Product Data
GHS classification, signal word, pictograms, H-statements: Not specified for this item; refer to SDS.
General safety information (literature; not a specification)
Hazard profile: Many triarylmethane dyes (including gentian/crystal violet) are harmful if swallowed and may cause skin/eye irritation. Environmental hazard to aquatic life has been reported for related dyes. Handle as a hazardous dye.
PPE: Lab coat, nitrile gloves, and splash-resistant safety goggles. Use a particulate respirator if dust may be generated; handle powders in a fume hood or ventilated enclosure to avoid staining and inhalation.
First aid (general):
Skin: Wash with soap and copious water; remove contaminated clothing.
Eyes: Rinse cautiously with water for several minutes; seek medical advice if irritation persists.
Ingestion/Inhalation: Move to fresh air; rinse mouth; seek medical attention as needed.
Handling specifics: The dye strongly stains skin, plastics, glass, and benchtops. Work over lined surfaces and immediately wipe spills with ethanol or aqueous detergent. Avoid strong bases if color integrity must be maintained (base promotes leuco conversion and decolorization).
Incompatibilities (general): Strong oxidizers and strong bases (affect chromophore); avoid prolonged exposure to high-intensity light in solution to limit photofading.
Always consult the product-specific SDS for authoritative hazard classification, exposure limits, and response procedures.
Solvent Selection
Relevance to this product type
Gentian violet is a highly conjugated, cationic triarylmethane dye; solubility and spectral properties are strongly solvent- and acidity-dependent. Solvent choice governs color intensity, stability, and adsorption to labware.
Polarity/miscibility (literature)
Water: Soluble when paired with an appropriate counterion (e.g., chloride); color and λmax shift with pH and ionic strength.
Alcohols (MeOH, EtOH, i-PrOH): Freely soluble; commonly used for stock solutions due to rapid dissolution and wetting of labware.
Polar aprotics (DMF, DMSO, acetonitrile): Very good solubility; useful for anhydrous work or when water must be excluded.
Nonpolar solvents (toluene, hexanes): Poor solubility; strong ion-pairing required for transfer to nonpolar media.
Selection guidance
Choose water or ethanol for routine staining solutions; buffer the medium to maintain consistent hue and molar absorptivity.
Use DMSO or DMF to prepare high-concentration stocks for photochemistry or polymer doping; dilute into the working aqueous/alcoholic medium immediately before use to minimize aggregation.
Avoid strong base in the working solvent if maintaining the violet chromophore is essential; base promotes the colorless carbinol (leuco) form.
Small comparison (literature trends)
Ethanol: Fast wetting, good stability, easily evaporates from surfaces after staining.
Water (buffered, pH ~5–7): Reproducible spectra and consistent staining of acidic matrices.
DMSO: Highest solvating power; use for master stocks where aqueous solubility is limiting.
Storage and Reconstitution
Item-specific guidance from Product Data
Storage conditions: Room temperature.
Shipped in: Not specified for this item; refer to CoA/Spec Sheet.
General guidance (literature; complementing the above)
Light sensitivity: Store solids and solutions protected from light (amber bottles or foil-wrapped) to minimize photofading.
Atmosphere: Normal lab atmosphere is acceptable for solids; minimize exposure of solutions to strong base or oxidants if color integrity must be preserved.
Reconstitution:
Solvents: Water, ethanol, methanol, or DMSO are commonly used. Select based on application and compatibility with your system.
Procedure: Add solvent incrementally with gentle swirling to avoid localized high concentrations that can cause clumping on glassware. For analytical stocks, filter through 0.22–0.45 µm PTFE or PES.
Concentration ranges: Working solutions are often 0.01–1% w/v for stains, or 1–100 µM for spectroscopic/kinetic studies (literature; adjust as needed).
Freeze–thaw: Not generally required; prepare fresh solutions as needed. If long-term storage of solution is necessary, aliquot into amber vials and refrigerate; verify stability before critical use.
Always consult the lot-specific CoA/SDS for definitive guidance on grade, counterion, and stability.
Structure and Identity
Item-specific identifiers from Product Data
CAS: 7438-46-2
InChIKey: Not specified for this item; refer to CoA/Spec Sheet.
SMILES: Not specified for this item; refer to CoA/Spec Sheet.
Molecular formula: Not specified for this item; refer to CoA/Spec Sheet.
Molecular weight: Not specified for this item; refer to CoA/Spec Sheet.
Literature identity (for the gentian violet/crystal violet cation)
Common name: Gentian violet cation (crystal violet cation; hexamethylpararosaniline cation)
Typical molecular formula (literature): C25H30N3+
Typical molecular weight (literature): ~372.5 g/mol (cation only); ~407.98 g/mol for the chloride salt
Core scaffold: Triarylmethyl (triphenylmethyl) carbocation bearing three p-dimethylamino substituents.
Structural description
The molecule is a triarylmethyl cation: a central sp2-hybridized carbenium carbon bound to three para-dimethylaminophenyl rings.
Each anilinium ring donates electron density via para N,N-dimethylamino groups, stabilizing the colored cation by resonance; extensive conjugation across the aryl–carbenium framework underlies its intense violet color.
Counterions are not part of the cation structure; commercial materials may be supplied as salts (e.g., chloride), but this listing specifies the cationic form in name only. Verify exact counterion/grade on the CoA for stoichiometry-sensitive work.
Synthetic Utility
Relevance
While gentian violet is primarily a dye, its triarylmethyl cation structure imparts distinct reactivity that can be leveraged in synthetic and mechanistic studies.
Utility in synthesis and mechanistic chemistry (literature)
Carbocation chemistry: The triarylmethyl center is a persistent carbocation stabilized by three p-dimethylaminophenyl groups. It serves as a model for studying resonance stabilization, ion pairing, and nucleophilic capture to form leuco (carbinol) derivatives.
Redox transformations: Readily reduced to the leuco form (a colorless carbinol) by nucleophiles or reductants; reoxidation regenerates the cationic chromophore, enabling redox cycling probes.
Photosensitization: Strong absorption in the visible permits use as a photosensitizer or electron-transfer mediator under green light, initiating radical processes in presence of sacrificial donors/acceptors.
Ion-pair extraction: Forms tight ion pairs with hydrophobic anions (e.g., tetraphenylborate), useful for phase-transfer and microextraction studies.
Practical notes
Reaction monitoring by UV–Vis is straightforward due to the large ε near 590 nm; kinetic analyses often use pseudo-first-order conditions.
Proton activity and nucleophile concentration govern the balance between cationic and leuco forms; maintain controlled moisture/base to preserve the desired state.
For solid handling in synthesis, specify and control the counterion (commonly Cl−) to ensure reproducibility of stoichiometry and solubility.
Target Specificity
Not applicable.
This product is a small-molecule dye, not a biological targeting reagent or antibody. No antigen/epitope specificity, clone, isotype, or species reactivity applies.
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