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Deep red heteropolyvanadates of phosphorus(V) n M 2 O:P 2 O 5 : 13 V 2 O 5  · aq (n = 3, 5, 6; M = Na, K, Rb, Cs, NH 4 ) and n M 2 O: P 2 O 5 : 14 V 2 O 5  · aq (n = 4, 7; M = K, Rb, Cs, NH 4 , (n-C 4 H 9 ) 4 N) were prepared. Recrystallization of 1: 13- and 1: 14-heteropolyvanadates and determination of molecular weight by ultracentrifuge technique in solutions from V 2 O 5  and NaH 2 PO 4  indicate 1: 14-heteropolyvanadate ions to be stable species over a wide range of pH, while 1: 13-heteropolyvanadate ions are only stabilized in higher acidified solutions containing H 2 PO 4  -  or as slightly soluble salts. Wide line  1 H NMR spectra are interpreted in terms of OH groups and H 2 O of cristallization, the isolated heteropolyvanadates of both series consisting of protonated anions; the basicity of heteropolyvanadic acids of phosphorus(V) is unknown.

1: 13- und 1: 14-Heteropolyvanadate des Phosphors(V) / 1:13- and 1:14- Heteropolyvanadates of Phosphorus(V)