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Infrared spectra of fatty acid zinc salts. (a) Full spectrum; (b) C‒H stretching region; and (c) carboxylate region. In all spectra: C8, zinc octanoate; C9 zinc nonanoate; C10, zinc decanoate; C12, zinc dodecanoate; C14, zinc tetradecanoate; C16, zinc hexadecanoate; C18, zinc octadecanoate; C24, zinc tetracosanoate. The negative peaks at ~2380 cm−1 correspond to carbon dioxide as a result of improper background subtraction.
