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Two new low-dimensional Mn(Ⅱ) coordination compounds of Mn(H2pimdc)2(phen) (compound 1)and [Mn(Hpimdc)(phen)]n·nH2O (compound 2) were synthesized,where H3pimdc is a 2-propyl-imidazole-4,5-dicarboxylic acid and phen is 1,10-phenanthroline.Both compounds were thoroughly analyzed by X-ray single-crystal diffraction,element analysis,IR spectra,PXRD and thermal analysis.X-ray single-crystal diffraction analyses indicate that the phen ligands terminate metal ions on two sides to prevent the linkage between the neighboring metal ions into a higher dimensional structure in compounds 1 and 2.Compound 1 is constructed from mononuclear molecules which form the 1D helical supramolecular chain by N-H…O hydrogen bonds.In compound 2,Hpimdc is a tetradentate bridging ligand,which binds Mn(Ⅱ) ions to generate a single-stranded right helical chain parallel to the b axis.These 1D chains are additionally coupled by H-bonds as well as π…π stacking interactions,which formed a 3D supramolecular structure.Additionally,compound 2 demonstrated temperature-dependent magnetic susceptibility and negative value of θ (equal to-9.09 K),which is indicative of weak antiferromagnetic interactions between Mn(Ⅱ) ions.