The synergistic co-operation of N—H...O=P hydrogen bonds and C—H...O X weak intermolecular interactions ( X is =P or —C) in the (CH 3 O) 2 P(O)(NH–NHC 6 F 5 ) amidophosphoester: a combined X-ray crystallographic and theoretical study

The asymmetric unit of O , O ′-dimethyl [(2,3,4,5,6-pentafluorophenyl)hydrazinyl]phosphonate, C 8 H 8 F 5 N 2 O 3 P, is composed of two symmetry-independent molecules with significant differences in the orientations of the C 6 F 5 and OMe groups. In the crystal structure, a one-dimensional assembly is mediated from classical N—H...O hydrogen bonds, which includes R 2 2 (8), D (2) and some higher-order graph-set motifs. By also considering weak C—H...O=P and C—H...O—C intermolecular interactions, a two-dimensional network extends along the ab plane. The strengths of the hydrogen bonds were evaluated using quantum chemical calculations with the GAUSSIAN09 software package at the B3LYP/6-311G(d,p) level of theory. The LP(O) to σ*(NH) and σ*(CH) charge-transfer interactions were examined according to second-order perturbation theory in natural bond orbital (NBO) methodology. The hydrogen-bonded clusters of molecules, including N—H...O and C—H...O interactions, were constructed as input files for the calculations and the strengths of the hydrogen bonds are as follows: N—H...O [ R 2 2 (8)] > N—H...O [ D (2)] > C—H...O. The decomposed fingerprint plots show that the contribution portions of the F...H/H...F contacts in both molecules are the largest.