Abstract
Abstract Two complexes of copper(II) nitrate, [Cu(NO3)2(12-crown-4)] and [Cu(OH2)2(15-crown-5)][NO3]2, have been prepared by direct reaction of the hydrated salt with the appropriate crown ether in 3:1 CH3CN:CH3OH. The crystal structures of both complexes have been determined. [Cu(NO3)2(12-crown-4)] crystallizes with a directly coordinated crown molecule and two tight ion pairs. Due to the relatively small size of Cu2+, the nitrate anions are monodentate giving Cu2+ a coordination number of six and a very distorted octahedral geometry. [Cu(OH2)2(15-crown-5)][NO3]2 is seven-coordinate with Cu2+/O interactions to the crown ether and two water molecules. The two anions reside in the hydrogen-bonded secondary coordination sphere. There is a fairly wide range of Cu-O(crown ether) distances in both complexes: Cu-O(12-crown-4) = 2.040(4)-2.387(4)A, Cu-O(15-crown-5) = 2.010(5)-2.343(8)A.
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