Manganese triazacyclononane

Manganese Triazacyclononane Catalysts Crafted under Reaction Conditions 1181... 

Raol997 Rao, Y.V.S., De Vos, D.E. and Jacobs, P.A., Practical Heterogenisation of an Active Manganese Triazacyclononane Epoxidation Catalyst via Surface Glycidylation, J. Chem. Soc., Chem. Commun., (1997) 355-356. 

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... 

Under mildly basic conditions the manganese(II) species [MnLH3][MnCl4] [where LH3 = N,N N"-tris[(2S)-2-hydroxypropyl]-1,4,7-triazacyclononane (LH3)] partially deprotonates and on aerial... 

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." ... 

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." ... 

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. " ... 

Relative to the behavior of the 1,4,7-tris(carboxymethyl)-1,4,7-triazacyclononane ring, the contribution to Aml values of the 1,4,7-triazacyclononane fragment in the corresponding 1,4-bis(carboxymethyl)-1,4,7-triazacyclononane macrocycle is greater towards softer metal ions than towards harder ones such as manganese(ll). " ... 

E. HEXAKIS CYANO(l,4-BIS(2-PYRIDYLMETHYL)-l,4,7-TRIAZACYCLONONANE)MANGANESE(II) IRON(II) OCTAPERCHLORATE PENTAHYDRATE, [ Mn(dmptacn)(CN) 6Fe][C104]8 5H2O... 

Cii4Hi5oClgFeMn6N36032-5H20, Iron, hexa-kis cyano( 1,4-bis(2-pyridylmethyl)-1,4,7-triazacyclononane) manganese(II) -, octaperchlorate, pentahydrate,... 

On the other hand, in homogeneous epoxidation catalysis, De Vos et al. [6] have explored the properties of manganese (II) salts in the presence of triazacyclononane derivatives and... 

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