Crystal and Molecular Structures
of Bis{bromo[1,2-bis(2-(o-hydroxyphenoxy)ethyloxy)-
ethane]potassium} [K₂Br₂(C₁₈H₂₂O₆)₂]

A. N. Chekhlov

Institute of Problems of Chemical Physics, Russian Academy of Sciences,
Chernogolovka, Moscow oblast, 142432 Russia

Received September 30, 2004

Abstract—A crystalline complex of the 1,2-bis(2-(o-hydroxyphenoxy)ethyloxy)ethane podand (L) with potas-
sium bromide having the formula [K₂Br₂L₂] has been synthesized and studied by X-ray diffraction: space group
P, a = 8.000 Å, b = 11.223 Å, c = 11.637 Å, = 106.40, = 100.13, = 92.14, and Z = 1. The structure
is solved by direct methods and refined by the full-matrix least-squares method in the anisotropic approxima-
tion to R = 0.038 for 3068 reflections (CAD4 automated diffractometer, MoK). Monomers [KBrL] of the
host–guest type are unified by two bridging OH groups (one group from each of the L podands) to form cen-
trosymmetrical dimers [K₂Br₂L₂]. In the monomer, the L podand “wraps” around the K⁺ cation. The coordina-
tion polyhedron of the latter is a strongly distorted hexagonal bipyramid with a base composed of all six O
atoms of the L podand and two axial vertices occupied by the Br^– anion and the O atom of one OH group of the
neighboring (in the dimer) L podand. Molecules in the crystal are linked by hydrogen bonds of the OH···Br
type to form “thick” infinite chains running along the x axis.

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