Abstract:
A series of new heterobinuclear complexes obtained by the reaction of [Mo(NO){HB(dmpz)3
}
Cl2
]; [HB(dmpz)3 = tris(3,5-dimethylpyrazolyl)borate] with Cobalt(III) Schi -base complexes
derived by condensation of 1mol equiv. of 2,4-dihydroxylbenzaldehyde and salicylaldehyde with
Į,Ȧ-diamines [NH2
(CH2
)
nNH2
,n = 2-4, 1,2-C6H4
(NH2
)
2
] were synthesized. !e complexes were
studied by electrochemistry and UV/VIS/NIR spectroelectrochemistry in DCM and MeCN to
evaluate how the Schi base donors a ect the properties of the complexes. !e coordination of the
Schi base appeared to occur through the two azomethine nitrogens and the two o-OH groups,
while the molybdenum complex coordinated through the terminal m-OH of the Schi bases. From
cyclic and di erential pulse voltammetric data it was shown that the E1/2 values for monometallic
Co(III)/(II) redox couple shifted to less cathodic values as the ethylene backbone increased. !e
corresponding bimetallic complexes had two reduction waves associated with the cobalt(III)/(II)
and Mo (NO) (III)/ (II) redox couples. A comparison of the reduction peak potentials of these
complexes in DCM and MeCN solvents revealed that the potentials in dichloromethane DCM
are more cathodic than in MeCN suggesting that the type of solvent used has a signi"cant e ect
on the electron distribution of the two metal centres.
