A new cadmium(Ⅱ) complex[Cd(Hminic)(IP)]_n(1,Hminic = 2-hydroxy-6-methylisonicotinic acid,IP = imidazo[4,5-f]-l,10-phenanthroline),has been synthesized by the reaction of a Hminic and auxiliary N-containing ligands with Cd(Ⅱ) ion under hydrothermal conditions.The complex was studied by elemental analysis,IR spectroscopy and X-ray crystallography.It is formulated as C_(20)H_(13)CdN_5O_3,crystallizes in monoclinic system,space group C2/c with α=9.6764(8),b = 26.767(2),c = 14.1332(11) A and β= 97.4510(10)°.V= 3629.7(5) A~3,Z = 8,Mr=483.75,D_c = 1.770 g/cm~3,F(000) = 1484 and μ= 1.237 mm~(-1).The final refinement gave R = 0.0309 and wR = 0.0703 for 4151 reflections with I> 2σ(I).In the structure of 1,two Cd(Ⅱ) atoms are joined by a pair of μ_2-hydroxyl oxygen atoms giving rise to a dinuclear Cd(Ⅱ) unit which is bridged by Hminic linkers to form a 1D ladder-like polymer chain.The chelating ligand IP coordinated to the Cd(Ⅱ) atom,and alternately attached to both sides of the ladder-like polymer chain.Adjacent chains are further bound together by strong intermolecular hydrogen bonds and face-to-face π…πinteractions,resulting in the formation of a 3D supramolecular architecture.Furthermore,the thermal stability and luminescent properties of this complex and the free ligands have been investigated. A new cadmium (Ⅱ) complex [Cd (Hminic) (IP)] _ n (1, Hminic = 2-hydroxy-6-methylisonicotinic acid, IP = imidazo [4,5-f] -l,10-phenanthroline) was synthesized by the reaction of a Hminic and auxiliary N-containing ligands with Cd (II) ion under hydrothermal conditions. The complex was studied by elemental analysis, IR spectroscopy and X-ray crystallography. It is formulated as C 20 H_ ( 13) CdN_5O_3, crystallizes in monoclinic system, space group C2 / c with α = 9.6764 (8), b = 26.767 (2), c = 14.1332 (11) A and β = 97.4510 (10) ° .V = 3629.7 ) A ~ 3, Z = 8, Mr = 483.75, D_c = 1.770 g / cm ~ 3, F (000) = 1484 and μ = 1.237 mm -1. The final refinement gave R = 0.0309 and wR = for 4151 reflections with I> 2σ (I) .In the structure of 1, two Cd (Ⅱ) atoms are joined by a pair of μ_2 -hydroxy oxygen atoms giving rise to a dinuclear Cd (Ⅱ) unit which is bridged by Hminic linkers to form a 1D ladder-like polymer chain. chelating ligand IP coordinated to the Cd (Ⅱ) atom, and sequential attached to both sides of the ladder-like polymer chain. Adjacent chains are further bound together by strong intermolecular hydrogen bonds and face-to-face π ... πinteractions, resulting in the formation of a 3D supramolecular architecture. Futurertherm, the thermal stability and luminescent properties of this complex and the free ligands have been investigated.