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The hydrothermal synthesis of five new metal-organic frameworks based on 2,4,6-tris(4-pyridyl)-1,3,5-triazine (tpt) ligand is described. The results from thermal analysis provide insight into thermal stabilities and luminescent properties of complexes.

In the title complex, [Mn(C8H4NO6)2(H2O)4]·2H2O, cyclic water tetra­mers forming one-dimensional metal–water chains have been observed. The water clusters are trapped by the co-­operative association of coordination inter­actions and hydrogen bonds. The MnII ion resides on a center of symmetry and is in an octa­hedral coordination environment comprising two O atoms from two 5-carboxy-2-nitrobenzoate ligands and four O atoms from water mol­ecules. [ABSTRACT FROM AUTHOR]