SYNTHESES OF SOME TRANSITION-METAL COMPLEXES CONTAINING THE TRIPODAL LIGAND HB(PR(I)MEC3N2H)3 AND THE X-RAY CRYSTAL-STRUCTURE OF [MO(NO)-(HB(3-PR(I)-5-MEC3N2H)3)(OET)2]

The new complexes [M{HB (Pr(i)MeC3N2H)3{X] (M = Tl, X = nothing; M = Ni or Co, X = NCS or NCO; M = Zn, X = NCS or N3), [M{HB(Pr(i)MeC3N2H)3}2] (M = Fe, Co, Ni, or Zn), [Mo{HB(Pr(i)MeC3N2H)3}{eta3-CH2C(Me)CH2}(CO)2], and [Mo(NO){HB (Pr(i)MeC3N2H)3}X(Y)] (X = Y = CO, l, OMe, or OEt; X = l, Y = OMe or OEt) have been synthesised. The compounds [Mo(NO){HB(Pr(i)MeC3N2H)3}X(Y)] (X = Y = CO or l; X = l, Y = OMe or OEt); were isolated as a mixture of at least two isomers. A single-crystal X-ray diffraction study of [Mo(NO){HB(Pr(i)MeC3N2H)3}(OEt)2] shows that the molybdenum atom is in an approximately octahedral co-ordination environment. The bulky Pr(i) groups on the tripodal ligand are all in the 3 position closest to the ethoxide ligands with Mo-O distances of 1.86(1) and 1.91 (1) angstrom and Mo-O-C(Et) angles both of 129(1)-degrees.