%0 Journal Article %T Combination of X-ray crystallography and theoretical study to evaluate the effect of N-H...O=P versus N-H...O=C hydrogen bonds on the N-H stretching frequencies %A Pourayoubi, Mehrdad %A Izadyar, Mohammad %A Elahi, Behrouz %A Masood Parvez %J Journal of Molecular Structure %@ 0022-2860 %D 2013