Synthesen und Strukturen der Lithiumtianate(III) und (IV), (py)2Li[(py)2Ti(OPh)4] und (py)2Li[(py)Ti(OPh)5]

The new lithiumtitanates (py)2Li[(py)2Ti(OPh)4] (1) and (py)2Li[(py)Ti(OPh)5] (2) have been obtained from the reaction of titaniumtrichloride (respectively titaniumtetrachloride2) with LiOPh in the presence of the base pyridine (py). The crystal structures of both compounds show that the titanium atoms are in the centres of distorted octahedral coordination figures. In compound1, four oxygen and two nitrogen atoms (incisorientation) are bonded to titanium, whereas in2, five oxygen and one nitrogen atom form the coordination polyeder around titanium. In both compounds, the lithium atoms are attached through phenolate bridges to the octahedra. The titanate (py)2Li[(py)2Ti(OPh)4] (1) has a single absorption band in the visible region of the UV-spectrum showing a shoulder shifted to the bathochromic region, due to the Jahn-Teller-effect for d1-systems.