Abstract
A new cyclohexasilicate, K 2PbSi 3O 9·H 2O, was synthesized under mild hydrothermal conditions. The crystal structure was solved by powder X-ray diffraction data. The unit cell is monoclinic, a = 6.5623(2), b = 11.7757(3), c = 13.0483(3) Å, β = 103.57(2)°, space group P2 1/n, Z = 4. The structure consists of a framework of isolated Si 6O 18 rings with the Pb(IV) located in octahedral holes. Thus, the structural formula can be written as Pb 2K 4{uB, 6t}[Si 6O 18]·2H 2O. The structure encloses one eight membered monodimensional channel running parallel to the a axis of about 3.0 × 5.5 Å 2. This channel is filled with one of the two crystallographically independent potassium cations and the water molecules. A second smaller six-membered ring channel along a is also present and contains the second K +. This compound represents a monoclinic version of the better-known orthorhombic members of the family.
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