The Crystal Structure of Decyltrimethylammonium Chloride with Rac-1,1′-Bi-2-Naphthol

Abstract

The X-ray structure analysis of 1:1 crystal complex of decyltrimethylammonium chloride with rac-1,1′-bi-2-naphthol (hereafter, 10TAC/BNP) yielded a triclinic lattice with symmetry, formula C₃₃H₄₂NClO₃, formula weight 536.15, crystal size 0.10 × 0.20 × 0.10 mm³, a = 9.999(1) Å, b = 19.420(1) Å, c = 8.977(9) Å, α = 92.845(8)°, β = 112.718(7)°, γ = 98.396(7)°, V = 1579.9(3) ų, Z = 2, ρ _calc  = 1.135 g cm⁻³, 2θmax = 120.2°, m.p = 168.7°C, and the asymmetric unit consists of a molecule each of 10TAC, BNP, and water. The crystal structure shows a distinct similarity in the packing structure observed in crystal complexes of monoalkyltrimethylammonium halides with planar aromatic molecules. The arrangement of the naphthol planes as per controlled by the hydrogen bond network plays significant role in the packing structure. The combined actions of hydrogen bonding, electrostatic interactions and C-H^…π interactions contribute to the stability and formation of the crystal complex.

Keywords:

• complexes
• decyltrimethylammonium chloride
• diffraction
• Hydrogen bonding
• interactions
• racemic

ACKNOWLEDGMENT

The author E. M. wishes to express his sincere gratitude to the Ministry of Education and Sports for the financial support awarded to him to pursue research in Japan.