Results and Discussion
The title complex crystallized in the triclinic system with theP 1 space group. The unit cell comprises one lysine, one mandelic and two water molecules (Figure 1). The lysine exists in the cationic form in which backbone (N1) and side chain (N2) amino groups are protonated and carboxylic acid group is deprotonated. The mandelic acid carries a negative charge due to the loss of proton from the carboxylic acid moiety. This proton is transferred to the lysine side chain amino group (N2). In the crystal, lysine in the cationic form and mandelic acid in the anionic form and thus charge neutrality was achieved.