Synthesis
Two preparation methods involve the direct reactions with H2 gas. The first entails the addition of H2 to an unsaturated metal center, as originally reported for W(CO)3(P-i-Pr3)2(H2). In some cases, H2 will displace weakly bound ligands, sometimes even halides in favorable cases:
- LnMX + H2 → + + X−
Many metal hydrides can be protonated to give dihydrogen complexes:
- LnM−H + H+ → +
In such cases the acid usually is derived from a weakly coordinating anion.
Read more about this topic: Dihydrogen Complex
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