Xylenol Orange Tetrasodium Salt is a synthetic fluorochrome acid dye known for its characteristic orange-red coloration. It has the molecular formula C₃₁H₂₈N₂Na₄O₁₃S and has a strong affinity for coordination with metal ions. It is a water soluble form of xylenol orange including several ionizable groups that contribute to its anionic character and metal complexing behavior. The dye can interact with different metal ions to form colored coordination complexes, resulting in measurable changes in its optical properties. These characteristics make the compound valuable analytical reagent for studying metal-ion interactions and pH-dependent color transitions in laboratory systems.
CAS No.: 3618-43-7
Synonyms: Xylenol Orange tetrasodium, tetrasodium;2-[[5-[3-[3-[[bis(carboxylatomethyl)amino]methyl]-4-hydroxy-5-methylphenyl]-2,2-dioxo-1,2lambda6-benzoxathiol-3-yl]-2-hydroxy-3-methylphenyl]methyl-(carboxylatomethyl)amino]acetate.
| Physical Properties | |
| Chemical formula | C31H28N2Na4O13S |
| IUPAC Name | 2,2′,2′′,2′′′-{(1,1-Dioxo-2,1λ6-benzoxathiole-3,3(1H)-diyl)bis [(6-hydroxy-5-methyl-3,1-phenylene)methylenenitrilo]}tetraacetic acid |
| Molecular weight | 760.58 g/mol |
| Solubility | Soluble in water |
| λmax | 580 nm |
| Appearance | Dark red to dark brown crystals or powder |
| Storage | Store at room temperature |
| Chemical Properties | |
| Color | Very dark brown to very dark red |
| Physical State | Solid |
| Melting Point | 195 °C |
| Ph | 8.1 (20 °C, 10 g/L in H2O) |
| Odor | Odorless |
| Pictograms : | No Information Available. |
| Hazard Statements : | No Information Available. |
| Precautionary Statements: | No Information Available |
Xylenol Orange Tetrasodium Salt is a synthetic fluorochrome acid dye known for its characteristic orange-red coloration. It has the molecular formula C₃₁H₂₈N₂Na₄O₁₃S and has a strong affinity for coordination with metal ions. It is a water soluble form of xylenol orange including several ionizable groups that contribute to its anionic character and metal complexing behavior. The dye can interact with different metal ions to form colored coordination complexes, resulting in measurable changes in its optical properties. These characteristics make the compound valuable analytical reagent for studying metal-ion interactions and pH-dependent color transitions in laboratory systems.
CAS No.: 3618-43-7
Synonyms: Xylenol Orange tetrasodium, tetrasodium;2-[[5-[3-[3-[[bis(carboxylatomethyl)amino]methyl]-4-hydroxy-5-methylphenyl]-2,2-dioxo-1,2lambda6-benzoxathiol-3-yl]-2-hydroxy-3-methylphenyl]methyl-(carboxylatomethyl)amino]acetate.
| Physical Properties | |
| Chemical formula | C31H28N2Na4O13S |
| IUPAC Name | 2,2′,2′′,2′′′-{(1,1-Dioxo-2,1λ6-benzoxathiole-3,3(1H)-diyl)bis [(6-hydroxy-5-methyl-3,1-phenylene)methylenenitrilo]}tetraacetic acid |
| Molecular weight | 760.58 g/mol |
| Solubility | Soluble in water |
| λmax | 580 nm |
| Appearance | Dark red to dark brown crystals or powder |
| Storage | Store at room temperature |
| Chemical Properties | |
| Color | Very dark brown to very dark red |
| Physical State | Solid |
| Melting Point | 195 °C |
| Ph | 8.1 (20 °C, 10 g/L in H2O) |
| Odor | Odorless |
| Pictograms : | No Information Available. |
| Hazard Statements : | No Information Available. |
| Precautionary Statements: | No Information Available |
Xylenol Orange Tetrasodium Salt is mainly used as a metal-ion indicator in complexometric titrations and particularly in analytical methods involving EDTA. Its ability to interact with metal ions also makes it useful as a spectrophotometric reagent, where changes in optical properties can be measured to identify different metal ions in chemical samples.
Xylenol Orange acts as a metallochromic indicator by forming a reversible complex with metal ions during complexometric titration. The metal–indicator complex produces an intense red to purple coloration. As EDTA is added, it preferentially binds the available metal ions and gradually displaces Xylenol Orange from the complex. Once the metal ions have been captured by EDTA, the indicator remains in its free form and giving a yellow color that signals the titration endpoint.
