Accurate Measurements of Bond Dissociation Energies
Finally, we have used the fact that the diatomic open d-subshell transition metal molecules have extremely large numbers of low energy electronic states to determine bond energies to high accuracy by the observation of a sharp predissociation threshold in a congested vibronic spectrum. This has provided the following bond energies:
| Nickel Group Dimers | Transition Metal Cations: | |||
| Ni2 | 2.042(2) eV | Ti2+ | 2.435(2) eV | |
| NiPt | 2.798(3) eV | V2+ | 3.140(2) eV | |
| Pt2 | 3.14(2) eV | Co2+ | 2.765(1) eV | |
| Co3+ | 2.086(2) eV | |||
| Early-Late Intermetallics: | V3+ | 2.323(1) eV | ||
| TiCo | 2.401(1) eV | TiO+-Mn | 1.763(1) eV | |
| VNi | 2.100(1) eV | |||
| YCo | 2.591(1) eV | Other Metal Dimers and Trimers: | ||
| YNi | 2.904(1) eV | Rh2 | 2.4059(5) eV | |
| ZrCo | 3.137(1) eV | Al3 | 2.701(5) eV | |
| ZrNi | 2.861(1) eV | |||
| NbCo | 2.729(1) eV | Transition Metal – Main Group Bonds: | ||
| NbNi | 2.780(1) eV | Carbides: | ||
| TiC | 3.857(4) eV | |||
| Transition Metal Aluminides: | ZrC | 4.892(10) eV | ||
| AlV | 1.489(10) eV | HfC | 4.426(3) eV | |
| AlCr | 2.272(9) eV | ThC | 5.060(3) eV | |
| AlCo | 1.844(2) eV | VC | 4.109(3) eV | |
| AlNi | 2.29(5) eV | NbC | 5.620(4) eV | |
| TaC | 4.975(3) eV | |||
| Multiply-Bonded Diatomic Metals: | WC | 5.289(8) eV | ||
| TiV | 2.068(1) eV | FeC | 3.961(19) eV | |
| TiNb | 3.092(1) eV | NiC | 4.167(3) eV | |
| V2 | 2.753(1) eV | Nitrides: | ||
| VZr | 2.663(3) eV | VN | 4.997(2) eV | |
| TiZr | 2.183(1) eV | Silicides: | ||
| NbCr | 3.0263(6) eV | TiSi | 2.201(3) eV | |
| Zr2 | 3.052(1) eV | ZrSi | 2.950(3) eV | |
| CrW | 2.867(1) eV | HfSi | 2.871(3) eV | |
| VSi | 2.234(3) eV | |||
| NbSi | 3.080(3) eV | |||
| TaSi | 2.999(3) eV | |||
| WSi | 3.103(3) eV | |||
| FeSi | 2.402(3) eV | |||
| RuSi | 4.132(3) eV | |||
| OsSi | 4.516(3) eV | |||
| CoSi | 2.862(3) eV | |||
| RhSi | 4.169(3) eV | |||
| IrSi | 4.952(3) eV | |||
| NiSi | 3.324(3) eV | |||
| PtSi | 5.325(9) eV | |||
| Sulfides: | ||||
| VS | 4.535(3) eV | |||
| WS | 4.935(3) eV | |||
| FeS | 3.240(3) eV | |||
| NiS | 3.651(3) eV | |||
| Selenides: | ||||
| TiSe | 3.998(6) eV | |||
| ZrSe | 4.902(3) eV | |||
| HfSe | 5.154(4) eV | |||
| VSe | 3.884(3) eV | |||
| NbSe | 4.834(3) eV | |||
| TaSe | 4.705(3) eV | |||
| FeSe | 2.739(6) eV | |||
| NiSe | 3.218(3) eV | |||
| Chlorides: | ||||
| WCl | 3.818(6) eV | |||
We have made many more contributions than those listed here, often providing a qualitative understanding of the bonding in a transition metal-containing species. This is just too much to summarize in a short paper like this.