H10 N2 O7 P2 Averbuch-Pouchot M, Durif A European Journal of Solid State and Inorganic Chemistry 29 (1992) 191-198 Crystal structure of diammonium-dihydrogeno-diphosphate: (NH4)2H2P2O7 _cod_database_code 1007205 _database_code_amcsd 0012549 9.058 11.199 7.764 90 108.40 90 P2_1/a atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) P1 .70704 .02085 .7665 .0166 .0160 .0181 -.0019 .0082 -.0026 P2 .79628 .00622 .1696 .0136 .0130 .0178 .0002 .0056 -.0003 O1 .8140 .0141 .9714 .0204 .026 .0198 .0048 .0086 -.0010 O2 .5568 -.0559 .7287 .0163 .024 .035 -.0047 .0116 -.0078 O3 .7983 -.0287 .6509 .0212 .037 .0261 -.0074 .0139 -.0140 O4 .6758 .1517 .7582 .033 .018 .028 .0004 .0125 .0031 O5 .6488 -.0535 .1727 .0151 .023 .030 -.0043 .0103 -.0027 O6 .9387 -.0660 .2898 .0172 .0198 .030 .0012 .0024 .0070 O7 .8089 .1373 .2107 .0267 .0138 .022 -.0004 .0084 -.0021 N1 -.0112 .7502 .9678 .025 .019 .031 -.001 .0110 .000 N2 .1499 .7318 .4588 .032 .019 .022 .002 .008 .000 H1 .049 .690 .039 H2 .537 .718 .899 H3 .533 .302 .958 H4 .398 .780 .907 H5 .300 .167 .5 H6 .446 .214 .609 H7 .148 .788 .548 H8 .200 .754 .403 H9 .009 .520 .748 H10 .027 .967 .323