Use the data in Table 8.3 to estimate the O–O stretching wavenumber expected for a compound believed to contain the oxygenyl species O₂⁺. Would you expect to observe this stretching vibration in 

(i) The IR spectrum or 

(ii) The Raman spectrum

Table 8.3

TABLE 8.3 Characteristic fundamental stretching wavenumbers of some common molecular species as free molecules or ions, or coordinated to a metal centre Species OH NH CH BH CN- CO (terminal) CO (bridging) R,C=0 NO 0 0 Si-O Metal-Cl Metal-metal bonds Range/cm- 3400-3600 3200-3400 2900-3200 2600-2800 2000-2200 1900-2100 1800-1900 1600-1760 1675-1870 920-1120 800-900 900-1100 250-500 120-400