Three novel alkali metal–cadmium coordination polymers [K2Cd­(Hsb)4(H2O)6]3n 1, [NaCd­(sip)­(DMF)2(H2O)2]2n 2, and [NaCd2(sip)2(DMF)2(H2O)2]2n ·2nHdeta·2nH2O 3 (H2sb = 4-sulfobenzoic acid, H3sip = 5-sulfoisophthalic acid) have been synthesized and characterized by single crystal X-ray diffraction and spectroscopic and thermogravimetric methods. The solid state structure of 1 consists of inorganic layers, formed from Na2O10 and CdO6, polyhedral units, bridged via the sulfonate site of the ligand. The layers are pillared by the organic portions of the ligands to form a three-dimensional framework classified as I2O1. Compounds 2 and 3 display inorganic–organic hybrid layers arranged in 3D via nonspecific (hydrophobic) interactions between the DMF ligands. The two-dimensional frameworks of the layers are classified as I1O1 (in 2) and I0O2 (in 3). The guest diethylammonium ions in 3 are arranged in hydrophobic channels along the [011] crystallographic direction and circumvented by the DMF ligands.

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In the original paper, bond lengths in Table 2 were omitted. The corrected table appears below.