Ammonium (18-crown-6)(triphenylphosphine oxide) perchlorate: Synthesis and crystal structure

A new compound, ammonium (18-crown-6)(triphenylphosphine oxide) perchlorate (I), is synthesized, and its crystal structure is studied using X-ray diffraction analysis (space group R3m, a = 14.432 angstrom, c = 14.034 angstrom, Z = 3, direct method, full-matrix least-squares method in the anisotropic approximation, R = 0.064 for 1945 independent reflections, CAD4 automated diffractometer, lambda MoK alpha radiation). In the structure, the N-4(+) cation resides in the 18-crown-6 macrocycle cavity and is hydrogen-bonded with three symmetrically equivalent O atoms of the 18-crown-6 molecule and with the phosphoryl O atom of the Ph3PO molecule. The P = O center dot center dot center dot H-N and Cl atoms occupy the partial position 3m. The oxygen atoms of the ClO4- anion are disordered over the 3m position.