Intermolecular iodine-iodine interactions in bis(pyridine-3-carboxylato)[tetrakis(4-iodophenyl)porphyrinato]tin(IV) and bis(pyrimidine-5-carboxylato)[tetrakis(4-iodophenyl)porphyrinato]tin(IV).

Crystals of bis­(pyridine-3-carboxyl­ato)[tetra­kis­(4-iodo­phenyl)porphyrin­ato]tin(IV) di­methyl­formamide sesqui­solvate, [Sn(C44H24I4N4)(C6H4NO2)2]·1.5C3H7NO, (I), and bis­(pyri­midine-5-carboxyl­ato)[tetra­kis­(4-iodo­phenyl)porphyrin­ato]tin(IV) di­methyl­formamide sesquisolvate, [Sn(C44H24I4N4)(C5H3N2O2)2]·1.5C3H7NO, (II), exhibit inter­porphyrin iodine–iodine halogen bonds, which direct the supra­molecular assembly of the porphyrin entities into halogen-bonded layers. Each mol­ecule inter­acts with its four nearest neighbours within the layer via eight I⋯I inter­actions at approximately 3.8 and 4.0 A. The two structures are isomorphous and isometric, with the metalloporphyrin complexes located on centres of crystallographic inversion.