The new layered germanate structure Na4Ge16O28(OH)12 has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, FTIR, and SEM. The crystal lattice parameters are a = 7.3216(6) A, b = 14.3986(9) A, c = 7.7437(6) A, alpha = 90.0 degrees, beta = 100.179(7) degrees, gamma = 90.0 degrees, and V = 803.5(1) A3. The space group is C2/m with Z = 1. The germanium oxide sheets are connected non-covalently via electrostatic interactions with the sodium cations and H-bridging. At temperatures above 400 degrees C, the structure starts decomposing into sodium enneagermanate (Na4Ge9O20), germanium dioxide, and water as determined by powder X-ray diffraction, TGA, DTA, DSC, and GCMS.
Ge 16 O 28 (OH) 12 . -Single crystals of the title compound are prepared hydrothermally from an aq. NaOH solution of GeO2 (autoclave, 150°C, 96 h). Na4Ge16O28(OH)12 crystallizes in the monoclinic space group C2/m with Z = 1. The structure consists of germanium oxide sheets which are interconnected via electrostatic interactions with the Na + cations and hydrogen bonds. The compound is stable up to 400°C and then starts to decompose into Na
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