The Formation of Isomorphous Packing Structures in Complexes of Dodecyltrimethylammonium Halides Complexes with Rac-1,1′-Bi-2-naphthol

Abstract

The crystal and molecular structures of 1:1 complexes of dodecyltrimethylammonium bromide and chloride adducts of rac-1,1′-Bi-2-naphthol (hereafter, 12TAB/BNP and 12TAC/BNP) have been determined by X-ray diffraction techniques. The crystal data and crystal structures revealed that the complexes crystallize in monoclinic crystal system with space group (P2₁/a) and Z-value (4), and also exhibit isomorphous packing structure. The crystal complexes are stabilized by electrostatic interactions, hydrogen bonds, and C–H…π interactions. The different lattice parameters as well as the different sizes of the halide ions (Br⁻ and Cl⁻) do not prevent both complexes (12TAB/BNP and 12TAC/BNP) from crystallizing with similar packing as well as common hydrogen bonding network and non-bonded interactions. Thus, the entering or leaving groups (Br⁻/Cl⁻) do not alter the existing hydrogen bonding and any other non-bonded interactions and thereby effects isomorphous packing structure.

Keywords:

• dodecyltrimethylammonium bromide
• dodecyltrimethylammonium chloride
• H-bonds
• Isomorphism
• rac-1,1′-Bi-2-naphthol

ACKNOWLEDGMENT

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.