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Guanidiniumditellurate obtained from aqueous solution at room temperature forms triclinic crystals of space group P1̄ with lattice parameters a = 17.486(4) Å, b = 8.459(7) Å, c = 7.134(8) Å; a = 107.42(2)°, β = 83.95(2)° and y = 103.14(2)°. The unit cell contains two crystallographically independent anions with symmetry centers at 0, 0, 0 and 1/2, 0, 1/2. They consist of two octahedral TeO 4 (OH) 2  units which share two common oxygen atoms. The guanidinium ions are connected over an irregular network of bridging hydrogens and terminal oxygen atoms of the anions, in similar manner as ditellurate ions are joined by water molecules in aqueous solutions: the Raman spectrum of the guanidinium salt is nearly identical with the solution spectrum of a ditellurate, but exhibits pronounced differences regarding the spectrum of the solid potassium salt K 4 Te 2 O 6 (OH) 2  • 7 H 2 O

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Struktur und Schwingungsspektrum des Tetraguanidiniumditellurats, [C(NH 2 ) 3 ] 4 Te 2 O 6 (0H) 4  / Structure and Vibrational Spectrum of Guanidiniumditellurate, [C(NH 2 ) 3 ] 4 Te 2 O 6 (0H) 4