title: Vibrational spectroscopic study of DL-methionine dihydrogen phosphate.
abstract: The two methionine cations in the asymmetric part of the unit cell of bis(DL-methionine dihydrogen phosphate) have different conformations. This, together with the different environments seen by the two -CH2- groups in each skeleton cause several of the group wavenumbers to occur as doublets or as broad bands. The anion contains two dissimilar P-O bonds, which distorts the phosphate tetrahedron. Due to this, the stretching wavenumbers appear as doublets. There is extensive hydrogen bonding in the system in all three crystallographic directions and this is responsible for the changes in the position and intensity of several bands. Fermi resonance has also been observed.
authors.affiliation: Microprocessor and Computer Department, School of Physics, Madurai Kamnarj University, India.
authors.forename: B J
authors.initials: BJ
authors.lastname: Rajkumar
authors.forename: V
authors.initials: V
authors.lastname: Ramakrishnan
mesh_terms: D006801:Humans; D008715:Methionine / Q000737:chemistry*; D010756:Phosphoric Acids / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D010756:Phosphoric Acids; D008715:Methionine; C030242:phosphoric acid