Transition-metal complexes of the macrocyclic ligand 5,7,12,14-tetra-methyl- 1,4,8,11-tetra-azacyclotetradeca-4,11-diene
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 13,p. 1261-1266
- https://doi.org/10.1039/dt9770001261
Abstract
The reaction of the monohydroperchlorate salt of 1,2-diaminoethane with pent-3-en-2-one in methanol solution gives the dihydroperchlorate salt of 5,7,12,14-tetramethyl-1,4,8,11-tetra-azacyclotetradeca-4,11-diene (L·2HClO4). The reaction is not completely stereospecific and ca. 15% of the C-rac-ligand is formed in conjunction with the C-meso-ligand. A series of octahedral cobalt(III) complexes of the general type trans-[CoLX2]n+(X = Cl–, Br–, [NO2]–, [CN]–, [N3]–, [MeCO2]–, NH3, or Cl–[NO2]–) have been prepared by anion-metathesis reactions with the C-meso-N-meso(e–e) stereoisomer of trans-[CoCl2L]+, and n.m.r. studies confirm this configuration in the other complexes. The preparations of the µ-peroxo-complex [{CoL(OH2)}2O2][ClO4]4·H2O and the four-co-ordinate complex [CuL][ClO4]2 are also described. The stereochemistry of the various complexes is discussed and i.r. and d–d spectra are reported.Keywords
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