Manganese triazacyclononane complexes

Manganese(III) complexes of a number of phenolate pendant arm macrocycles related to the above have also been reported. Thus, both l,4,7-tris(2-hydroxybenzyl)-l,4,7-triazacyclononane and l,4,7-tris(3-t-butyl-2-hydroxybenzyl)-l,4,7-triazacyclononane, on tris-deprotonation, afford monomeric pseudooctahedral complexes with this ion." ... 

Hage, R. and Lienke, A., Bleach and oxidation catalysis by manganese-l,4,7-triazacyclononane complexes amd hydrogen peroxide, J. Mol. Catal. A Chemical, 251 150-158, 2006. 

The use of such flow and/or stopped flow systems has been used quite extensively to investigate the kinetics of radical reactions. These include the use of a stopped flow EPR system to investigate the one-electron oxidation of a range of phenols by a dimeric manganese(rV/TV) triazacyclononane complex with and without hydrogen peroxide. 

The vanadium(IV) complex of salen in zeolite was found to be an effective catalyst for the room temperature epoxidation of cyclohexene using t-butyl hydroperoxide as oxidant.88 Well-characterized vanadyl bis-bipyridine complexes encapsulated in Y zeolite were used as oxidation catalysts.101 Ligation of manganese ions in zeolites with 1,4,7-triazacyclononanes gives rise to a binu-clear complex stabilized by the zeolites but allows oxidation with excellent selectivity (Scheme 7.4). 

Derivatives of Diamantoidal Geometry. Figure 42 shows the tetrahedral (diamantoidal) geometry assumed by the four manganese atoms in complex [Mn406(tacn)4]4+ (tacn = 1,4,7-triazacyclononane), which was the first tetranuclear manganese complex to be structurally characterized.56,57... 

The 1 1 complex of the tris-A-propionate derivative of 1,4,7-triazacyclononane has been synthesized and X-ray diffraction has confirmed that all ligand donors are bound to the manganese(III) ion surprisingly there was no evidence for a Jahn-Teller distortion of the type expected for a high-spin rf system of this type." ... 

Tris-N-functionalization of 1,4,7-triazacyclononane has yielded a variety of sexadentate ligands, which form stable complexes with manganese(II). For example, the l,4,7-tris(2-pyridyl-methyl) derivative gives a complex of type [MnL](C104)2 in which the manganese ion has a... 

The solution complexation behavior of manganese(II) and selected other transition and posttransition metal ions with 1-carboxymethyl-1,4,7-triazacyclononane has been investigated by potentiometric titration, with the stabilities of the 1 1 complexes found to follow the usual Irving-Williams stability order. " ... 

Triazacyclononane 61 and related crown-type systems are important ligands in inorganic chemistry and they have been extensively reviewed . Manganese complexes of substituted... 

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