title: Crystal growth and structure of L-methionine L-methioninium hydrogen maleate-a new NLO material.
abstract: A new organic nonlinear optical (NLO) crystal from the amino acid family, viz., L-methionine L-methioninium hydrogen maleate (LMMM), has been grown by slow evaporation method from aqueous solution. Bulk crystals were grown using submerged seed solution method. The structure was elucidated using the single crystal x-ray diffraction data. The compound crystallized in the space group P21and the unit cell contains a protonated L-methioninium cation and a zwitterionic methionine residue plus a maleate anion. The backbone conformation angles Ψ1and Ψ2are incisandtransconfigurations for both the methionine and methioninium residues, respectively. Amino and carboxyl groups of the methioninium and methionine residues are connected through N-H…O hydrogen bonds leading to a ring R22(10) motif.
authors.affiliation: Department of Physics, Madurai Kamaraj University, Madurai-625 021, India.
authors.forename: Subramanian
authors.initials: S
authors.lastname: Natarajan
authors.affiliation: Department of Physics, Madurai Kamaraj University, Madurai-625 021, India.
authors.forename: Neelamagam
authors.initials: N
authors.lastname: Rajan Devi
authors.affiliation: Department of Physics, Madurai Kamaraj University, Madurai-625 021, India.
authors.forename: Sathiya Dhas Martin
authors.initials: SD
authors.lastname: Britto Dhas
authors.affiliation: Department of Physics, Kalasalingam University, Krishnankoil-626 190, India.
authors.forename: Shanmuganarayanan
authors.initials: S
authors.lastname: Athimoolam
keywords: L-methionine L-methioninium hydrogen maleate; crystal structure; nonlinear optical material; x-ray diffraction