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1,2,5-thiadiazole-3,4-dicarboxylic acid (H tdzdc) ligand has been used to construct three coordination compounds [Mg(tdzdc)(HO)]( 1), [Ca(tdzdc)(HO)]( 2) and [Sr(tdzdc)(HO)]( 3) by the solvothermal reaction. Single-crystal structure analyses reveal a mononuclear coordination structure for compound 1 and two dimensional coordination structure both for compound 2 and 3. Furthermore, all of these three compounds comprise any amount of hydrogen bond interactions, which extends their crystal structure into three dimensional (3D) frameworks. Different crystal structure of compounds 1- 3 reveals diversified coordination modes of H tdzdc ligand toward alkaline earth metal ions, depending mainly on the radius and the electron shell number of metal ions used. Graphical Abstract: Based on 1,2,5-thiadiazole-3,4-dicarboxylic acid (H tdzdc) ligand, three new alkaline earth metal compound were synthesized with different structure.[Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]