Table 1.
Summary of Isotopically Sensitive Vibrations of PN1; observed RR frequencies in cm−1 (isotope shift, cm−1), and calculated frequencies for cis and trans conformers (italicized numbers).
| Head 1 | OONO | 18O215N18O | 18O2NO | OO15N18O |
|---|---|---|---|---|
| ν(O–N) +δ(NO2) | 658 | 628 (−30) | 637 (−21) | 647 (−11) |
| cis | 708 | (−35) | (−26) | (−9) |
| trans | 845 | (−45) | (−35) | (−12) |
| ν(O–O) +δ(NO2) | 812 | 772 (−40) | --- | --- |
| cis | 833 | (−45) | (−37) | (−14) |
| trans | 630 | (−35) | (−23) | (−15) |
| ν(O–O) +δ(NO2) | 929 | 881 (−48) | 900 (−29) | 912 (−17) |
| cis | 970 | (−53) | (−35) | (−16) |
| trans | 1002 | (−51) | (−35) | (−15) |
| ν(N=O) | 1545 | 1480 (−65) | 1543 (−2) | 1482 (−43) |
| cis | 1601 | (−68) | (−2) | (−68) |
| trans | 1627 | (−74) | (−3) | (−72) |