Crystal Structure of Diaqua(1,2-bis(2-(o-hydroxyphenoxy)ethyloxy)ethane)(perchlorato-O)strontium Perchlorate Hydrate

Abstract

The aqua complex of podand 1,2-bis(2-(o-hydroxyphenoxy)ethyloxy)ethane (L) with strontium perchlorate of the composition [Sr(ClO4)L(H2O)2]+ · ClO4– · H2O (I) was synthesized and studied using X-ray diffraction analysis: space group P21/c, a = 16.195 A, b = 11.382 A, c = 16.646 A, β = 117.01°, Z = 4. The structure was solved by direct method and anisotropically refined by the full-matrix least-squares method to R = 0.069 for 4278 independent reflections (CAD4 autodiffractometer, λMoKα). Structure I contains complex cation [Sr(ClO4)L(H2O)2]+ of the host–guest type. The Sr2+ cation (coordination number 9) is coordinated to all six O atoms of the L podand, O atom of a disordered ClO4– ligand, and two O atoms of two water molecules. The coordination polyhedron of Sr2+ is irregular; in a rough approximation, it can be described as a face-centered cube. The crystal structure of I contains an infinite three-dimensional network of the O–H···O hydrogen bonds joining the complex cations, ClO4– anions, and molecules of crystallization water.