Two　new　hydrated　borates,　Zn-8[(BO3)(3)O-2(OH)(3)]　and　Pb[B5O8(OH)]　.　1.5H(2)O,　have　been　prepared　by　hydrothermal　reactions　at　170　degrees　C.　Single-crystal　X-ray　structural　analyses　showed　that　Zn-8[(BO3)(3)O-2(OH)(3)]　crystallizes　in　a　non-centrosymmetric　space　group　R32　with　a　=　8.006(2)　angstrom,　c　=　17.751(2)　angstrom,　Z　=　3　and　Pb[B5O8(OH)]　.　1.5H(2)O　in　a　triclinic　space　group　P　(1)　over　bar　with　a　=　6.656(2)　angstrom,　b　=　6.714(2)　angstrom,　c　=　10.701(2)　angstrom,　alpha　=　99.07(2)degrees,　beta　=　93.67(2)degrees,　gamma　=　118.87(1)degrees,　Z　=　2.　Zn-8[(BO3)(3)O-2(OH)(3)]　represents　a　new　structure　type　in　which　Zn-centered　tetrahedra　are　connected　via　common　vertices　leading　to　helical　ribbons　(1)(infinity)[Zn8O15(OH)(3)](17-)　that　pack　side　by　side　and　are　further　condensed　through　sharing　oxygen　atoms　to　form　a　three-dimensional　(3)(infinity)[Zn8O11(OH)(3)](9-)　framework.　The　boron　atoms　are　incorporated　into　the　channels　in　the　framework　to　complete　the　final　structure.　Pb[B5O8(OH)]　.　1.5H(2)O　is　a　layered　compound　containing　double　ring　[B5O8(OH)](2-)　building　units　that　share　exocyclic　oxygen　atoms　to　form　a　two-dimensional　layer.　Symmetry-center-related　layers　are　stacked　along　the　c-axis　and　held　together　by　interlayer　Pb2+　ions　and　water　molecules　via　electrostatic　and　hydrogen　bonding　interactions.　The　IR　spectra　further　confirmed　the　existence　of　both　triangular　BO3　and　OH　groups　in　Zn-8[(BO3)(3)O-2(OH)(3)],　and　BO3,　BO4,　OH　groups　as　well　as　guest　water　Molecules　in　Pb[B5O8(OH)]　.　1.5H(2)O.　(c)　2006　Elsevier　Inc.　All　rights　reserved.