A series of complexes of the form TpMo(NO)(L)(
2-L
![](/images/gifchars/pi.gif)
) were synthesized, where Tp =hydridotris(pyrazolyl)borate, L = 1-methylimidazole or ammonia, and L
![](/images/gifchars/pi.gif)
is an alkene, alkyne,ketone, polyaromatic hydrocarbon, or aromatic heterocycle. The thermal stability of thedihapto-coordinated aromatic complexes is indicative of a strong
![](/images/gifchars/pi.gif)
back-bonding interactionsimilar to that found in the heavy metal analogues [Os(NH
3)
5(
2-arene)]
2+, TpRe(CO)(L)(
2-arene), and TpW(NO)(L)(
2-arene). Several synthetic routes to these molybdenumcomplexes are outlined.