In the title compound, C4H12N+.C12H10O2P-, the Et2NH2+ and Ph2PO2- moieties
in the asymmetric unit are linked by P-O . . .H-N hydrogen bonds [O . . .N
distance 2.6722 (15) Angstrom]. These hydrogen-bonded pairs are in turn li
nked by intermolecular P-O . . .H-N hydrogen bonds [O . . .N distance 2.694
3 (15) Angstrom] to form infinite chains along 2(1) screw axes in the y dir
ection.