Peroxo coordination geometries

The most important feature observed in the x-ray structure of 5 is the side-on p-r 2 r 2-peroxo coordination that holds the two Cu[HB(3,5-iPr2pz)3] units together (Figure 8). This is a rare example of such a peroxo coordination in d-block chemistry there is a V complex [109] and other examples are known. The 0—0 bond distance of 1.412 (12) A is typical of peroxide, and the Cu. . . Cu distance is 3.560 A. The geometry about each Cu(II) ion is distorted square pyramidal with two shorter Cu—N bonds and a longer (2.258 A) axial pyrazolyl interaction [10,108],... 

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