New type of arrangement of rare-earth quinolinolate. Molecular structure of scandium 2-methyl-8-quinolinolate

The tetrakis 2-methyl-8-quinolinolate scandium complex [Sc(qMe)4(H)] (1) have been prepared by the reaction of ScCl3 with 2-methyl-8-quinolinol (HqMe) in methanol in the presence of aqueous ammonia. The X-ray diffraction analysis has shown that a molecule of (1) has a propeller like shape herein the Sc(III) ion is surrounded by four methylquinolinolate ligands two of which are chelate but the other two are monodentate and one of these monodentate methylquinolinolate ligands contains hydrogen atom at nitrogen atom. Furthermore there are two molecules of water per one complex molecule not coordinated to the Sc cation that is not typical for rare-earth compounds.