A　new　gadolinium　iodate　has　been　synthesized　via　hydrothermal　method,　and　its　structure　was　determined　as　[Gd(H2O)(IO3)(2)(IO3H2O)](n)　(1)　by　X-ray　single-crystal　diffraction.　The　2-D　layer　is　built　from　the　linkage　of　Gd2O16I4　dimer　via　mu(2)/mu(3)-bridged　iodates,　and　the　quasi-3-D　network　is　generated　via　weak　I　center　dot　center　dot　center　dot　O　bonds　and　hydrogen　bonds.　FTIR,　powder　X-ray　diffraction　(PXRD)　and　UV-Vis　spectra　were　conducted　to　characterize　the　as-synthesized　sample.　Interestingly,　1　exhibits　green　emission,　which　might　be　assigned　to　electronic　transfer　within　iodate　groups.　The　UV　adsorption　of　1　hints　its　UV　light-driven　photocatalytic　property,　and　as　expected,　it　exhibits　photocatalytic　activity　for　the　degradation　of　rhodamine　B.　Theoretical　calculation　was　conducted　to　give　structure/property　correlation.