Synthesis, crystal structures and spectroscopic characterization of [Ti8O8(OOCR)16] (where RÂ =Â But, CH2But, C(CH3)2Et)

New multinuclear titanium(IV) oxo carboxylates of the general formula [Ti8O8(OOCR)16] (where R = But (1), CH2But (2), C(CH3)2Et (3)) have been synthesized and characterized by single-crystal X-ray diffraction and spectroscopic techniques. Titanium atoms form oligomeric rings [Ti8(μ2-O)8], where each Ti cation is surrounded by six oxygen atoms (two μ2-oxo and four μ-carboxylato bridges).