Preparation and Crystal Structure of a 1:4 Diaqua(benzo-15-crown-5)(perchlorato-O)Calcium Perchlorate and Diaqua(4'-nitrobenzo-15-crown-5)(perchlorato-O)Calcium Perchlorate Solid Solution

摘要

A 1:4 diaqua(benzo-15-crown-5)(perchlorato-O)calcium perchlorate and diaqua(4'-nitrobenzo-15-crown-5)(perchlorato-O)calcium solid solution [Ca(ClO_4)L centre dot H_2O)_2]~+ClO_4~- [L = (B15C5)_(0.2)(4'-NO_2-B15C5)_(0.8)] was prepared and studied by X-ray diffraction.The complex cation [Ca(ClO_4)L(H_2O)_2]~+ is of the guest-host type.The coordination polyhedron of its Ca~(2+) cation is irregular,viz.a distorted prism with two different bases:pentagonal (of five ether oxygen atoms of mixed crown ligand L) and trigonal (of one oxygen atom of the anionic ligand ClO_4~- and two oxygen atoms of the two water molecules).The packing of the complex cations and disordered ClO_4~- anions in the crystal structure of this solid solution was determined to find that these ions are connected by hydrogen bonds into infinite three-dimensional layers.