| υ(a) | IR intensities(a) | υ(b) | IR intensities(b) |
Ni(1)-O(3) | - | - | 269.9 | 1.7 |
Ni(1)-O(2) Ni(1)-N(6) | - - | - - | 269.9 576.8 | 1.7 31.1 |
Ni(1)-N(20) O(3)-C(12) | - 1123.4 | - 19.8 | 506.1 1300.9 | 1.7 220.6 |
N(6)-C(23) O(11)-C(12) C(12)-C(23) | 1123.4 1841.2 989.5 | 19. 8 289.5 28.1 | 1099.9 1760.2 1012.2 | 4.2 1132.4 3.3 |