New inorganic discrete 8-membered wheel clusters: Organically directed titanium sulfate supermolecules

Two organically directed titanium sulfates (C4N3H16)(5) (H3O)[TiO(SO4)(2)](8)center dot 15H(2)O (I) and (C4N2H12)(8) [TiO(SO4)(2)](8)center dot 23H(2)O (II), have been synthesized and characterized. I crystallizes in the orthorhombic space group Puma, crystal data: a = 16.5834 angstrom, b = 19.9129 c=29.1383 angstrom, V=9622.15 angstrom(3), and Z=4; II crystallizes in the monoclinic space group C2/c, crystal data: a=23.1596(17) angstrom, b=28.786(2) angstrom, c=20.7720(15) angstrom, beta=121.0930(10)degrees,V=11858.6(15) angstrom(3), and Z = 4. Two compounds are featured as uncommon discrete [TiO(SO4)(2)](8) wheel clusters encapsulating different amines. The amines with linear and cyclic structures are located in different positions, respectively, involving host-guest interaction. (c) 2008 Published by Elsevier B.V.