NOVEL OPEN-FRAMEWORK TIN(II) PHOSPHATE MATERIALS CONTAINING SN-O-SN LINKAGES AND 3-COORDINATED OXYGENS

Two new open-framework tin(II) phosphate materials have been synthesiz ed hydrothermally and their structures elucidated by single-crystal X- ray diffraction. These materials exhibit an entirely new building moti f, unknown in phosphate-based materials, viz., vertex-sharing truncate d square-pyramidal SnO4 units, in addition to the trigonal-pyramidal S nO3 units. The connectivity between the SnO3, SnO4, and PO4 units is s uch that Sn-O-Sn linkages are observed for the first time. The network ing creates three-coordinated oxygens in the structure. Crystal data f or compound I, [Sn-3(PO4)(2)(OH)](-). 0.5[(NH3)(CH2)(6)(NH3)](+): mono clinic, a = 9.315(2) Angstrom, b = 16.806(1) Angstrom, c = 9.513(3) An gstrom, beta = 1.1.1..03(1)degrees, V = 1390.0(5), Z = 4, M = 622.13(1 ), D-calc = 2.973 g cm(-3), Mo K alpha, R-F = 0.039. Crystal data for compound II, [Sn-3(PO4)(2)(OH)](-). 0.5[(NH3)(CH2)(8)(NH3)](+): orthor hombic, a 10.390(1) Angstrom, b=16.087(1) Angstrom, c = 18.717(1) Angs trom, V = 2849.3(1), Z = 4, M = 636.16(1), D-calc = 2.595 g cm(-3), Mo K alpha, R-F = 0.07.