2015. 56, 2 UDC 548.737 CHARACTERIZATION AND CRYSTAL STRUCTURE OF A 17-MEMBERED MACROCYCLIC SCHIFF BASE COMPOUND MeO-sal-pn-bn A.D. Khalaji1, S.H. Ghoran1, J. Rohlicek2, M. Dusek2 1Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran E-mail: ad.khalaji@gu.ac.ir 2Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic Received July, 7, 2013 – . 275 – 281 Revised — November, 6, 2014 The reaction of 1,4-diaminobutane with 2,2-diformyl-6,6-dimethoxy-diphenoxypropane in a mixed solvent of methanol and chloroform results in a new 17-membered macrocyclic Schiff base compound MeO-sal-pn-pn. <...> The title compound is characterized by the elemental analysis (CHN), FT-IR, 1H NMR spectroscopy, and powder X-ray diffraction. <...> The macrocyclic Schiff base compounds and their transition metal complexes play a key role in coordination chemistry [ 1—5]. <...> They are extensively studied for their capacity to bind and transport metal ions, for the possibility to act as models for metalloproteins [ 6, 7 ]. and for their role in hostguest and supramolecular chemistry [ 8—10]. <...> Macrocycles containing imine groups can form mono-, di-, and polynuclear transition metal complexes with various applications [11—14 ]. <...> Many synthetic methods for the preparation of Schiff base macrocyclic compounds use transition metal ions as templating agents [16—21 ]. <...> However, this method yields stable macrocyclic complexes, thus making the preparation of a metal free ligand difficult [16—21 ]. <...> Herein, we report the synthesis, characterization, and crystal structure of a 17-membered [1+1] macrocyclic Schiff base compound MeO-sal-pn-bn obtained by the condensation of 1,4-diaminobutane with 2,2-diformyl-6,6-dimethoxy-diphenoxypropane in a mixed solvent of methanol and chloroform (1:1 v/v) (Scheme 1). <...> EXPERIMENTAL All reagents and solvents for synthesis and analysis were commercially available and used as received without further purifications. <...> Elemental analyses were carried out using a Heraeus CHN—ORapid analyzer. <...> Infrared spectra were recorded using KBr disks on a FT-IR Perkin—Elmer spectrophotometer. 1H NMR spectra are measured on a BRUKER DRX-500 AVANCE spectrometer at 500 MHz. <...> All chemical shifts are reported in q units downfield from TMS 2,2-Diformyl-6,6 <...>