Two trimeric tri-TiIV-substituted Keggin tungstogermanates based on tetrahedral linkers

Two trimeric nine-TiIV contained tungstogermanates K14{K ⊂ [(Ge(OH)O3)(GeW9Ti3O38H2)3]} · 42H2O 1 and K10{K ⊂ [(SO4)(GeW9Ti3O38H3)3] · 40H2O 2 have been conventionally synthesized and characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. They were constructed from three tri-substituted A-α-[GeW9Ti3O38] and GeO4/SO4 tetrahedral linker. They display the first example of trimeric titanium-substituted tungstogermanates, which contain both Ti–O–Ti and Ti–O–Ge/Ti–O–S bridges.