STRONG HYDROGEN BONDED SUPRAMOLECULAR ARCHITECTURE IN A CRYSTAL OF THE {3-[2-(1,3-BENZODIOXOL-5-YL)-7-METHOXY-1-BENZOFURAN-5-YL] PROPYL} DIETHYLAMINE CATION WITH THE HYDROGEN BONDED CHLORIDE HYDRATE ANION (HALIDES) ASSEMBLY: X-RAY STRUCTURE, DFT CALCULATIONS, HIRSHFELD SURFACE ANALYSIS
G. Yakali1, S. E. Ozturk2, M. Aygun3
1Akdeniz University, Antalya, Turkey
2Ege University, Izmir, Turkey
3Dokuz Eylul University, Izmir Turkey
Keywords: crystal structure, benzofuran, bifurcated hydrogen bond, chloride hydrate, supramolecular architecture, tetramers, halides, DFT, Hirshfeld surface analysis
Abstract
A hydrogen bonded chloride hydrate assembly {[(H2O)Cl]}-¥ is ion-countered by organic molecular [C23H28NO4]+ cations and the crystal structure of {3-[2-(1,3-benzodioxol-5-yl)-7-methoxy-1-benzofuran-5-yl] propyl} diethylamine [C23H28NO4]+×[H2OCl]- is synthesized. Its structure is studied using X-ray crystallography. The molecular geometrical parameters, frontier molecular orbital energies (HOMO, LUMO), their energy gap (D E ), molecular electrostatic potential analysis of the compound are calculated by DFT/B3LYP at the 6-311G( d , p ) level. Benzofuran and benzodioxo ring systems of the title compound, except the diethylamine group, are essentially planar and a dihedral angle between the ring systems is 7.38(14)°. The complex compound crystallizes in the monoclinic space group P 21/ c , with a = 15.230(4) Å, b = 11.418(2) Å, c = 12.880(3) Å, b = 94.56(3)°, V = 2232.8(9) Å3, D calc = 1.297g/cm3, Z = 4. The hydrogen bonded chloride hydrate is self-assembled to form a supramolecular array of strong N-H…Cl and O-H…Cl bifurcated hydrogen bonds making tetramers which consist of a fused four-membered ring with a graph-set descriptor and a pseudo cyclic centrosymmetric (8) ring motif. The hybrid dihalide-dihydrate clusters of [Cl2(H2O)2]- are observed in the compound, too. The supramolecular crystal packing is consolidated by these bifurcated hydrogen bonds and the stacking of the sheet through strong p…p interactions. Moreover, the chain hydrogen bonds form intermolecular and intramolecular C-H…O hydrogen bonds and the 1D supramolecular array is organized by C-H…p interactions. The intercontacts in the crystal structure are analyzed using the Hirshfeld surfaces computational method. The calculated geometrical parameters are in good agreement with the observed single crystal XRD data.
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