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Salpn is the common name for a chelating ligand, properly called N,N′-bis-1,2-propanediamine, used as a motor oil additive.
The molecular structure of pure salpn, sometimes denoted H2 or salpnH2, can be described as the salen ligand with a methyl group attached to the ethylene bridge that links the two nitrogen atoms.
As in the case of salen compound, the actual ligand is usually the conjugate base salpn, the divalent anion that result from the metal-free compound by the loss of two hydroxyl protons. This dianion is commonly denoted "" in formulas of metal complexes.
The abbreviation "salpn" is also sometimes used for the structural isomer N,N′-bis-1,3-diaminopropane and its conjugate base, derived from 1,3-diaminopropane rather than 1,2-diaminopropane.