Synthesis and characterization of (NH4)4[H4V10O28][NTPH2]2·4H2O (NTPH3=N(CH2CH2COOH)3)

Reaction of (NH 4 )VO 3 with NTPH 3 (=N(CH 2 CH 2 COOH) 3 ) in water, at controlled pH, allowed the synthesis of (NH 4 ) 4 [H 4 V 10 O 28 ][NTPH 2 ] 2 ·4H 2 O salt, which has been characterized by spectroscopic measurements (NMR), electrospray mass spectrometry (ESMS) and X-ray diffraction studies. The structure is strongly stabilized by an extensive network of hydrogen bonding interactions which involve the tetraprotonated decavanadate anion, NTPH 2 ligand anions, ammonium cations and solvent water molecules.