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In the present paper we report crystal structures of four types ([A(1)mixed salts containing the sulfate anion (Y = SO 4 2− ) and amino acids A, i.e. sarcosine (Sar), dimethylglycine (DMG), betaine (Bet), β-alanine (β-Ala) and l-proline (l-Pro): (β-AlaH) (DMGH)SO 4 •2H 2 O (I), (β-AlaH)(BetH)SO 4 (II), (β-AlaH)(l-ProH)SO 4 (III), (BetH)(l-ProH)SO 4 (IV), (SarH) 3 (l-ProH) (SO 4 ) 2 (V), (β-AlaH)(l-ProH•••l-Pro)SO 4 (VI), and (β-AlaH)(β-AlaH•••DMG)SO 4 (VII). The O⋅⋅⋅O distances in dimeric cations (l-ProH•••l-Pro) and (β-AlaH•••DMG) are 2.450(3) and 2.5295(12) Å in (VI) and (VII), respectively. Crystal structure determinations of (β-AlaH)(BetH)SO 4 (II) at 100K (P2 1 /n), 200K (Pnma), 250K (Pnma) and room temperature (Pnma) revealed a structural phase transition in the interval between 100K and 200K.

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