Synthesis and electrochemistry of [Mo(NO){HB(mppz)3}X2](mppz = 3-p-methoxyphenylpyrazolyl, X = CO or Cl); crystal structure of [Mo(NO){HB(mppz)3}(CO)2]

Abstract

The new tripodal ligand K[HB(mppz)₃](mppz = 3-p-methoxyphenylpyrazolyl) and its complexes [Mo(NO){HB(mppz)₃}X₂](X = CO or Cl) have been synthesised. The crystal structure of the dicarbonyl complex shows that the molybdenum atom is in an approximately octahedral co-ordination environment and that the three aryl substituents on the tripodal ligand produce some steric compression of the coligand geometry to give (O)N–Mo–C and C–Mo–C angles in the range 83.7(6)–86.0(6)° as compared to 90.45(30)° for the analogous complex containing the HB(pz)₃(pz = pyrazolyl) ligand.