Über neuere Polymetallate / Polyanions of Novel Structural Types

By the application of newer preparative methods and specific organic cations single crystals of polymetallates were obtained of till now unknown structural types. These are salts with polyanions W 6 O 19 2- , W 10 O 32 4- , [HW 12 O 38 (OH) 2 ] 5- , Mo 6 O 19 2 - and HV 4 O 12 3- , furthermore para-tungstates A and B, as well as the compounds [N(CH) 3 ) 4 ] 2 Μο 8 Ο 25 ·5Η 2 Ο and [N(CH 3 ) 4 ] 2 Mo 10 O 31 · 7H 2 O. The structures of the anions W 6 O 19 2- and W 10 O 32 4 - were elucidated by X-Ray analyses; the structure of the Μο 6 Ο 19 2- was derived by vibrational spectroscopy. The knowledge of newer polyanion structures increasingly enables us to gain an insight into the complicated mechanism of oxyhydrate formation by acidification of metal salt solutions.