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Spectroscopic studies have been performed on [Cu2(XYL-0-)02]+ to determine the geometric and electronic structure of peroxide binding in this complex. The charge-transfer spectrum shows a band at 505 nm (e = 6300 M"1 cm"1) with a weaker shoulder near 610 nm (e = 2400 M"1 cm"1). Resonance Raman results indicate the presence of two enhanced vibrations, the copper peroxide stretch at 488 cm"1 (464 cm"1 using ls02) and the intraperoxide stretch at 803 cm"1 (750 cm"1 with 1802). The intensity of the intraperoxide stretch shows significant enhancement from both charge-transfer bands. However, the copper peroxide stretch is primarily in resonance with the higher energy transition. Oxygenation with an 160180 mixture indicates

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