Table 2. Average position, width and normalized integrated area of the two Cu(i)-N2 IR components (high frequency, HF and low frequency, LF) calculated by spectral deconvolution, including assignment.
| Composition (Cu/Al; Si/Al) | (0.1; 5) | (0.1; 14) | (0.5; 15) | (0.6; 29) |
| HF ∼ 2300 cm –1 ZCu( i ) 6r | ||||
| Position (cm–1) | 2299.0 ± 0.2 | 2299.0 ± 0.8 | 2296.0 ± 0.1 | 2297.0 ± 1 |
| Width (cm–1) | 11.2 ± 0.2 | 11.9 ± 0.9 | 12.0 ± 0.2 | 12 ± 2 |
| Norm. area (cm–1) | 0.45 | 0.62 | 1.00 | 0.35 |
| LF ∼ 2292 cm –1 ZCu( i ) 8r | ||||
| Position (cm–1) | 2291 ± 1 | 2291.0 ± 0.3 | 2292.00 ± 0.01 | 2291.0 ± 0.2 |
| Width (cm–1) | 11 ± 3 | 7.9 ± 0.6 | 5.1 ± 0.1 | 6.7 ± 0.4 |
| Norm. area (cm–1) | 0.06 | 0.33 | 0.56 | 0.56 |