L-PhenylalanineL-phenylalaninium malonate

Abstract

The asymmetric unit of the title compound, C9H11NO2·C9H12NO2+·C3H3O4−, consists of two phenyl­alanine mol­ecules, one as a zwitterion (P) and the other as a cation (P+), in addition to a malonate anion (Mal−). The phenyl­alaninium and phenyl­alanine mol­ecules are linked by a very short syn–syn carbox­yl–carboxyl­ate (–COO−⋯HOOC–) hydrogen bond [O⋯O = 2.429 (4) Å]. The Mal− anion is stabilized by a strong intra­molecular O—H⋯O hydrogen bond. The aggregation of P and P+ is mediated through Mal−, leading to an infinite double chain along the c axis.