Two　novel　Cd(II)-citrate　complexes　were　obtained　with　different　metal/ligand　ratios　through　hydrothermal　method.　Their　structures　were　determined　by　single-crystal　X-ray　diffraction　analysis.　Although　their　topological　structures　are　both　2-D　layer　network　assemblies,　both　central　Cd(II)　ions　and　Hcit3-　ligands　display　completely　different　coordination　modes.　In　polymeric　complex　1,　Hcit3-　serves　as　a　μ10-bridged　and　central　Cd(II)　ions　adopt　6-　and　8-coordinated　configurations.　In　contrast,　a　μ9-bridged　and　6-　and　7-coordinated　environments　between　Cd(II)　and　Hcit3-　are　established　in　the　polymeric　complex　2.　Two　Complexes　remain　stable　up　to　approximately　300°C.　The　complex　1　exhibits　strong　fluorescent　emission　band　at　450　nm　(λ=346　nm)　as　well　as　complex　2　exhibits　strong　fluorescent　emission　band　at　430　(λ=346　nm).　©　2005　Elsevier　B.V.　All　rights　reserved.