Compounds of glycine with metal sulfates and thio­sulfates: glycine cobalt sulfate penta­hydrate,glycine sodium thio­sulfate dihydrate and glycine potassium thio­sulfate

In the crystal structures of the title compounds, hexa­aqua­cobalt(II) tetra­aqua­diglycinato­cobalt(II) bis(sulfate), Co(H₂O)₆]Co(C₂H₅NO₂)₂(H₂O)₄](SO₄)₂, (I), polydiaqua‐μ₃‐glycinato‐di‐μ₄‐thio­sulfato‐tetra­sodium(I)], Na₄(C₂H₅NO₂)(S₂O₃)₂(H₂O)₂]_n, (II), and polyμ₂‐glycinato‐μ₄‐thio­sulfato‐dipotassium(I)], K₂(C₂H₅NO₂)(S₂O₃)]_n, (III), all atoms are located on general positions, except the Co atoms in (I), which are located on inversion centres. In (I), hydrogen bonds play an important role, while the alkali thio­sulfate compounds are characterized by three‐dimensional frameworks of polyhedra. Relations to other compounds of glycine and metal sulfates are commented on.