title: On the roles of close shell interactions in the structure of acyl-substituted hydrazones: An experimental and theoretical approach.
abstract: The 2-(phenyl-hydrazono)-succinic acid dimethyl ester compound was synthesized by reacting phenylhydrazine with dimethylacetylene dicarboxylate at room temperature and characterized by elemental analysis, infrared, Raman, (1)H and (13)C NMR spectroscopies and mass spectrometry. Its solid state structure was determined by X-ray diffraction methods. The X-ray structure determination corroborates that the molecule is present in the crystal as the hydrazone tautomer, probably favored by a strong intramolecular N-H···O=C hydrogen bond occurring between the carbonyl (-C=O) and the hydrazone -C=N-NH- groups. A substantial fragment of the molecular skeleton is planar due to an extended π-bonding delocalization. The topological analysis of the electron densities (Atom in Molecule, AIM) allows characterization of intramolecular N-H···O interaction, that can be classified as a resonant assisted hydrogen bond (RAHB). Moreover, the Natural Bond Orbital population analysis confirms that a strong hyperconjugative lpO1→σ*(N2-H) remote interaction between the C2=O1 and N2-H groups takes place. Periodic system electron density and topological analysis have been applied to characterize the intermolecular interactions in the crystal. Weak intermolecular interactions determine the crystal packing, and the prevalence of non-directional dispersive contributions are inferred on topological grounds. The IR spectrum of the crystalline compound was investigated by means of density functional theory calculations carried out with periodic boundary conditions on the crystal, showing excellent agreement between theory and the experiments. The vibrational assignment is complemented with the analysis of the Raman spectrum.
authors.affiliation: Department of Chemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan. Electronic address: aamersaeed@yahoo.com.
authors.forename: Aamer
authors.initials: A
authors.lastname: Saeed
authors.affiliation: Department of Chemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan.
authors.forename: M
authors.initials: M
authors.lastname: Ifzan Arshad
authors.affiliation: Institut für Anorganische Chemie, J.W.-Goethe-Universität, Max-von-Laue-Str. 7, D-60438 Frankfurt/Main, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Bolte
authors.affiliation: Instituto de Física La Plata (UNLP-CONICET), Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 49 y 115, La Plata, Buenos Aires, Argentina.
authors.forename: Adolfo C
authors.initials: AC
authors.lastname: Fantoni
authors.affiliation: CEQUINOR (UNLP, CONICET-CCT La Plata), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C.C. 962 (1900) La Plata, Buenos Aires, Argentina.
authors.forename: Zuly Y
authors.initials: ZY
authors.lastname: Delgado Espinoza
authors.affiliation: CEQUINOR (UNLP, CONICET-CCT La Plata), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C.C. 962 (1900) La Plata, Buenos Aires, Argentina. Electronic address: erben@quimica.unlp.edu.ar.
authors.forename: Mauricio F
authors.initials: MF
authors.lastname: Erben
keywords: AIM topological analysis; Crystal structure; FTIR spectroscopy; Hydrazone; Hydrogen bond; NBO; Raman spectroscopy