Three　2D　sandwich-like　layer　heterometallic　complexes,　formulated　as　[Ln(idaH)M(ida)2]n·0.5nH2O,　(H　2ida=iminodiacetic　acid,　Ln=Nd,　M=Co　(1);　Ln=La,　M=Co　(2);　Ln=La,　M=Ni　(3))　have　been　synthesized　under　hydrothermal　reaction　condition　and　characterized　by　X-ray　diffraction　single-crystal　structure　analysis,　IR　spectroscopy,　elemental　analysis,　TGA　analysis,　XPS　techniques　and　magnetic　analysis.　The　Ln　atoms　are　ten-coordinated　and　linked　up　into　chains　by　carboxylic　oxygen　atoms,　which　are　engrafted　by　six-coordinated　3d　transition　metal　atoms　on　both　sides　to　give　rise　to　belt-like　chains.　The　belt-like　chains　are　linked　up　into　2D　network　by　ida　ligands　and　further　extended　into　3D　open-framework　by　strong　hydrogen-bond　interactions.