CHARACTERIZATION OF SCHIFF BASES DERIVED FROM 3,4-DIMETHOXYBENZALDEHYDE: THE CRYSTAL STRUCTURE OF N,N?-BIS(3,4-DIMETHOXYBENZYLIDENE)-2,2-DIMETHYLPROPANE-1,3-DIAMINE HYDRATE

diimine Schiff base spectroscopy single crystal X-ray diffraction

STRUCTURES OF TWO HYDRAZONE COMPOUNDS DERIVED FROM 4-METHYLBENZOHYDRAZIDE, CRYSTAL STRUCTURES OF TWO 4-PHENYLBENZOPHENONES, ...

2013. 54, 4 UDC 548.737:541.67 OF N,N-BIS(3,4-DIMETHOXYBENZYLIDENE)-2,2-DIMETHYLPROPANE1,3-DIAMINE HYDRATE CHARACTERIZATION OF SCHIFF BASES DERIVED FROM 3,4-DIMETHOXYBENZALDEHYDE: THE CRYSTAL STRUCTURE A.D. Khalaji1, A. Foroghnia2, K. Fejfarova3, M. Dusek3 1Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran 2 E-mail: alidkhalaji@yahoo.com. & ad.khalaji@gu.ac.ir 3Department of Chemistry, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran Institute of Physics, Czech Academy of Sciences, Prague 8, Czech Republic Received March, 4, 2012 The Schiff base compounds N,N-bis(3,4-dimethoxybenzylidene)-2,2-dimethylpropane-1,3diamine hydrate, (3,4-MeO-ba)2Mepn.H2O (1), and N,N-bis(3,4-dimethoxybenzylidene)butane-1,4-diamine, (3,4-MeO-ba)2bn (2), with different central groups derived from 3,4tion. <...> Each imino functional group (—C=N—) is coplanar with its adjacent benzene ring and the two benzene rings form a dihedral angle of 86.868(27)ē. <...> The crystal structure of 1 is determined by single crystal X-ray diffracKeywords: diimine, Schiff base, spectroscopy, single crystal X-ray diffraction. <...> INTRODUCTION Schiff bases are widely used ligands in transition metal complexes and generally in inorganic chemistry [ 1, 2 ]. <...> The most common examples of these compounds are prepared from salicylaldehyde derivatives to form a Schiff base ligand [ 9, 10 ]. <...> Our group is interested in the synthesis, characterization and crystal structure of new Schiff base compounds and their transition metal complexes [ 11—14 ]. <...> As a part of our ongoing studies, we report the synthesis and spectral characterization of Schiff bases prepared by the condensation of 3,4-dimethoxybenzaldehyde and two diamine derivatives (Scheme 1). <...> After cooling the product was allowed to crystallize at room temperature. <...> The resulting colorless crystals were collected by filtration and dried at room temperature. <...> Single crystal with the dimensions 0.43ė0.30ė0.21 mm of 1 was chosen for the X-ray diffraction study. <...> The title compounds are stable at room temperature in methanol, ethanol, and acetonitrile for 5 days, and also remain unchanged in chloroform and dichloromethane for about 2 days [ 11 ]. <...> Compound 1 crystallizes in the monoclinic space group P21/n and is non-planar, with a dihedral angle between the two aromatic rings of 86.868(27)ē. <...> The bond lengths <...>

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