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Both crystals under study have two phenylalanine groups in the cationic part of the complex. In the l-phenylalanine l-phenylalaninium perchlorate crystal, two phenylalanine groups share one proton and become monoprotonated. In the bis(dl-phenylalaninium) sulphate monohydrate crystal, on the other hand, both the phenylalanine groups are protonated. This leads to several differences in the infrared...
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