New Salts of the Waterstable P2Se6 4− Anion

The structures of two new salts of the P2Se6 4− anion, [(py2Li)]4[P2Se6]·2py and [pyH]4[P2Se6]·H2O, prepared using a new synthetic route in solution starting from easily available educts, are presented. The salts are characterized also in solution by means of multinuclear (31P, 77Se, 7Li) NMR spectroscopy. The 31P and 77Se NMR spectrum of the waterstable P2Se6 4− anion are discussed in detail for the first time. The chemical shift of the P2Se6 4− anion in the Li+ salts depends strongly on the solvent used. Remarkably, the newly synthesized salts are stable in water.