Two new non-centrosymmetric lithium salts of glycine: bis(glycine) lithium chromate monohydrate and bis(glycine) lithium molybdate

Abstract

In bis­(glycine) lithium chromate monohydrate {systematic name: poly[aquadi-μ-glycinato-μ-tetra­oxochromato(VI)-dilithium(I)]}, [CrLi2(C2H5NO2)2O4(H2O)]n, (I) (space group P212121), and bis­(glycine) lithium molybdate {systematic name: poly[di-μ-glycinato-μ-tetra­oxomolybdato(VI)-dilithium(I)]}, [Li2Mo(C2H5NO2)2O4]n, (II) (space group P21), all atoms are located on general positions. The crystal structure of (I) is characterized by infinite chains of corner-sharing [LiO4] tetra­hedra, which are connected by glycine mol­ecules to form layers. [CrO4] tetra­hedra are attached to the [LiO4] tetra­hedra. Compound (II) contains dimers of [LiO4] tetra­hedra which are connected by [MoO4] tetra­hedra to form chains, which are in turn connected by glycine mol­ecules to form double layers.