N-(3,4-Dichlorophenyl)thiourea is a substituted thiourea with two chlorine atoms on the aromatic ring, supplied as a white to off-white crystalline powder at 98% purity. The thiourea group offers two nucleophilic nitrogen atoms and a sulfur donor, giving the molecule strong chelating and hydrogen-bonding ability, while the dichlorophenyl ring adds lipophilicity and a site for further
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Anthraquinone (CAS: 84-65-1) is the parent compound of the anthraquinone family, supplied as a light yellow crystalline powder. It is very stable and nearly insoluble in water. It is the basic raw material for anthraquinone dyes and is widely used as a digester additive in alkaline pulping, where it speeds delignification and increases pulp yield.
Hydrazobenzene (CAS: 122-66-7), or 1,2-diphenylhydrazine, is an aromatic hydrazine supplied as a pale yellow to light tan crystalline powder. It oxidises readily to azobenzene and rearranges under acid conditions to benzidine, so it must be stored cool and protected from air. It is mainly an intermediate for pharmaceutical and dye synthesis. It is air- and
Reactive Red 24 is a monochlorotriazine reactive dye based on a sulfonated naphthylazo chromophore, supplied as a red to dark red powder at 95% dye content. The molecule carries three sulfonate groups for water solubility and a chlorotriazine ring that reacts covalently with the hydroxyl groups of cellulose under alkaline conditions. Once fixed, the dye
1,4-Diamino-2,3-dicyanoanthraquinone is an anthraquinone bearing two amino and two cyano substituents, supplied as a dark blue to black powder at 98% purity. The four substituents withdraw and donate electron density in opposition, producing a deep blue chromophore while leaving the nitrile groups available for hydrolysis or cyclisation and the amino groups available for acylation and
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1,8-Dihydroxy-4,5-Dinitroanthraquinone is a chrysazin derivative carrying two nitro groups ortho to the hydroxyls, supplied as a yellow to orange powder at 98% purity. The two nitro groups make the adjacent hydroxyl protons strongly acidic and the aromatic ring highly electron-deficient, so the molecule forms deeply coloured salts and readily undergoes nucleophilic substitution. These features make
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1,8-Naphthalimide is the cyclic imide formed from 1,8-naphthalenedicarboxylic acid and ammonia, supplied as a white to off-white crystalline powder at 98% purity. The planar naphthalimide core is strongly fluorescent, thermally robust and easy to functionalise at the imide nitrogen or at the aromatic ring, which allows its optical properties to be tuned over a wide
1,4-Bis(4-cyanostyryl)benzene is a symmetrical stilbene-type optical brightener with two cyano groups, supplied as a pale yellow crystalline powder at 98% purity. The extended conjugated system absorbs ultraviolet light and re-emits it as visible blue fluorescence, which cancels the yellow cast in substrates and makes whites appear brighter. Because the molecule is rigid, thermally stable and
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Phthalocyanine Green (CAS 1328-53-6), also known as Pigment Green 7, is a highly chlorinated copper phthalocyanine pigment. The degree of chlorination varies; a commonly cited formula is C₃₂Cl₁₆CuN₈ (MW 1127.19), though products range between approximately C₃₂H₃Cl₁₃CuN₈ and C₃₂HCl₁₅CuN₈. It offers outstanding lightfastness, heat stability and chemical resistance.
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Tetrachloroperylene dianhydride is a perylene tetracarboxylic dianhydride bearing four chlorine substituents, supplied as a red to dark red powder at 98% purity. The perylene core provides a rigid, planar chromophore with high thermal and photochemical stability, and the four chlorines deepen the colour and shift absorption towards the red. The two anhydride groups react readily
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Diazinon (CAS: 333-41-5) is an organophosphate insecticide and acaricide supplied as a colorless to pale brown liquid. It is used as an active ingredient and analytical reference material. It acts by inhibiting acetylcholinesterase, and is soluble in most organic solvents and slightly in water. Use is regulated in many countries, so buyers should confirm local
Pigment Yellow 110 is a tetrachlorinated isoindolinone pigment, supplied as a yellow powder at 98% colour strength. The isoindolinone chromophore combines a rigid, hydrogen-bonded crystal lattice with eight chlorine atoms, giving a greenish-yellow shade of high opacity, strong tinting strength and outstanding resistance to light, heat and migration. These properties allow it to replace lead
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Orthanilic Acid (CAS: 88-21-1), or 2-aminobenzenesulfonic acid, is an aromatic amino-sulfonic acid used mainly as a diazo component in azo dye synthesis. It exists as a zwitterion and is a white to grey crystalline powder, slightly soluble in water. It is also used to make metal-complex dyes, optical brighteners and certain pharmaceutical intermediates. It is
N-Ethyl-N-hydroxyethyl-m-toluidine is a tertiary aromatic amine containing an ethyl group and a hydroxyethyl group, supplied as a colourless to pale yellow clear liquid at 99% purity. The hydroxyl group can be esterified, etherified or reacted with isocyanates, while the aromatic amine provides a strong electron donor that develops deep colour on oxidative coupling. Because the
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N-Methyl-N-hydroxyethylaniline is a tertiary amine combining an N-methyl aniline core with a primary alcohol, supplied as a colourless to pale yellow clear liquid at 99% purity. The two functional ends work independently: the aromatic nitrogen is an electron donor that participates in electrophilic substitution and oxidative coupling, while the terminal hydroxyl group can be esterified,
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Fluorescein Sodium (CAS: 518-47-8), also called uranine, is the water-soluble sodium salt of fluorescein, a classic fluorescent dye with intense yellow-green emission. It is supplied as an orange-red powder that dissolves in water to give strongly fluorescent solutions, even at very low concentrations. It is widely used as a tracer, a marker and a colorant
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