Sodium benzotriazolate, CAS 15217-42-2, is the sodium salt of 1H-benzotriazole. PubChem records the formula C6H4N3Na and identifies benzotriazole as the parent compound. Converting benzotriazole into its sodium salt changes ionization, solubility and handling while preserving the nitrogen-rich aromatic system responsible for much of benzotriazole chemistry.
Benzotriazole is best known for corrosion inhibition, particularly on copper and copper alloys. Its nitrogen atoms interact strongly with metal surfaces and can participate in formation of adsorbed protective layers. The sodium salt provides benzotriazolate in an ionic form that can be convenient for aqueous formulations. In solution, acid-base equilibria and the local metal surface determine which benzotriazole species are actually present, so the salt should be understood as a delivery form rather than as an entirely different corrosion-inhibitor mechanism.
The difference between parent acid and salt is practically important. Neutral benzotriazole has limited water solubility compared with an alkali-metal salt. Preparing a sodium form can simplify incorporation into water-based systems and avoids the need to neutralize the heterocycle during formulation. Commercial sodium benzotriazole products are consequently encountered in corrosion-control chemistry, although concentration and solution composition vary among products.
The triazole ring is also a useful synthetic unit. Deprotonation creates a benzotriazolate anion whose nitrogen nucleophilicity can be exploited in organic chemistry. However, the principal industrial context associated with sodium benzotriazolate remains the same interfacial chemistry that made benzotriazole famous: adsorption and complex formation at metal surfaces.
CAS 15217-42-2 therefore illustrates a simple but powerful formulation strategy. The active heterocyclic framework need not be redesigned; changing its proton to sodium can alter water compatibility and delivery. Once dissolved, the molecule can participate in the same family of equilibria and metal-binding interactions that underpin benzotriazole corrosion protection.
References:
1. PubChem, sodium 1H-benzotriazolide, CID 3517935, CAS 15217-42-2.
2. CAS Common Chemistry, Sodium benzotriazole, CAS 15217-42-2.
3. Finšgar M, Milošev I. Corros Sci. 2010;52:2737-2749.
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