Crystal structure of anhydrous poly[bis­(μ(2)-sarcosinato-κ(3) O,N:O′)copper(II)]

The title compound, [Cu(C(3)H(6)NO(2))(2)](n), is a bis-complex of the anion of sarcosine (N-methyl­glycine). The asymmetric unit consists of a copper(II) ion, located on a center of inversion, and one mol­ecule of the uninegative sarcosinate anion. The copper(II) ion exhibits a typical Jahn–Teller distorted [4 + 2] coordination geometry. The four shorter equatorial bonds are to the nitro­gen and carboxyl­ate O atoms of two sarcosinate anions, and the longer axial bonds are to carboxyl­ate O atoms of neighboring complexes. The overall structure is made up from two chains formed by these longer axial Cu—O bonds, one extending parallel to [011] and the other parallel to [0-11]. Each one-dimensional array is connected by the equatorial bridging moieties to the chains on either side, creating an extended two-dimensional framework parallel to (100). There is a single inter­molecular hydrogen-bonding inter­action within the sheets between the amino NH group and an O atom of an adjacent mol­ecule.