Characterisation of tridentate macrocyclic complexes of molybdenum(0) with tetra-aza macrocycles. Crystal structure of [ Mo(CO)3L1](L1= C-meso-5,5,7,12,12,14-hexamethyl-1,4,8,11 -tetra-azacyclotetradecane)
- 1 January 1989
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 11,p. 2183-2186
- https://doi.org/10.1039/dt9890002183
Abstract
The tetra-aza macrocyclic ligands L1(C-meso) and L2(C-racemic)(5,5,7,12,12,14-hexamethyl- 1,4,8,11 -tetra-azacyclotetradecane) react with [Mo(CO)6] in dry dimethylformamide to give the diamagnetic [ Mo(CO)3L1] and [ Mo(CO)3L2] respectively in which the potentially quadridentate ligand is tridentate. The [ Mo(CO)3L1] complex has been characterised by X-ray crystallography. It crystallises as yellow needles [monoclinic, a= 8.699(2), b= 19.839(4), c= 12.518(2)Å, β= 90.79(1)°; R converged to 0.022 for 2 243 independent reflections for which I/σ(I) > 6.01]. The crystal structure establishes that the ligand L1 co-ordinates via N(1), N(4), and N(8). Hydrogen bonding N(11)⋯ H–N(1) occurs within the complex. Cyclic voltammograms of both complexes determined using MeNO2 solvent display a quasi-reversible one-electron oxidation process corresponding to the Mo(O)/Mo(I) oxidation, with E½=–0.28 (L1) and =–0.27 V (L2) versus ferrocene—ferrocenium.Keywords
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