A Novel Monomeric Tin(II) Phosphate, [N(C2H5NH3)3]3+[Sn(PO4)(HPO4)]3−·4H2O, Connected through Hydrogen Bonding

The tin(II) phosphate, [N(C2H5NH3)3]3+[Sn(PO4)(HPO4)]3−4H2O, contains monomeric Sn2(PO4)2(HPO4)2units which form a hydrogen-bonded network with the TREN amine (TREN=N(C2H5NH3)3+ 3); triclinic, space groupP1 (no. 2),a=9.579(1),b=10.507(1),c=10.976(1) Å;α=72.93(1)°,β=78.03(1)°,γ=69.82(1)°,V=984.2(1) Å3,Z=2. The Sn2P2O4core of this unit is a common structural feature of open-framework tin phosphates and may play a role as a building block for this class of materials.