Triazacyclononane, complex with

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. 

Mononuclear complexes of palladium and platinum in the +3 oxidation state have only recently been unequivocally characterized [157]. The major advance has come in complexes with macrocyclic ligands such as 1,4,7-trithiacyclononane (ttcn) and 1,4,7-triazacyclononane (tacn) (Figure 3.96). 

A triazacyclononane ligand with a diphenyl phosphine pendant connected via a propyl linker formed a dimeric complex of zinc [Zn2L2Cl3][C104], 10... 

Bis(triazacyclononane) ligands (73) where the two macrocycles are linked with chains two to eight carbons in length have been complexed with zinc to form monomeric and dimeric... 

Pendent arm 1,4,7-triazacyclononane macrocycles (91) and (92) have been used to stabilize the zinc-to-phenoxyl bond allowing characterization of these compounds.477 The interest in the zinc complexes comes from the wide potential range in which it is redox stable allowing observation of the ligand-based redox processes, this allows study of the radical by EPR and the electronic spectra is unperturbed by d-d transitions. Macrocycles of the type l,4,7-tris(2-hydroxybenzyl)-1,4,7-triazacylononane form a bound phenoxyl radical in a reversible one-electron oxidation of the ligand. The EPR, resonance Raman, electronic spectra, and crystal structure of the phenoxide complexes were reported. This compound can be compared to a zinc complex with a non-coordinated phenoxyl radical as a pendent from the ligand.735... 

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 triazacyclononane ligand with o-aminophenylmethyl pendant arms (140) forms a bis-ligand complex with Fe +, isolated as its perchlorate. Aerial oxidation of this salt gives an uncharged iron(III) complex containing the ligand in triply-deprotonated form. ... 

In addition to chelate complexes, the cyclic amine 1,4,7-triazacyclononane will complex to platinum(II) and (IV). The hexacoordinate platinum(IV) complexes are bonded to two molecules of the tridentate ligand, but platinum(II) complexes with the ligand monodentate and bidentate.988 Also the formation of platinum(II) ammine complexes from chloride complexes is a reversible process. The rate constants decrease as the basicity of the leaving amine increases.989... 

Shul pin and coworkers described the application of a di- and a tetranudear iron complex with triazacyclononane acetate ligands in the oxidation of alkanes and alcohols with H202 [47]. A highly complex tetranudear iron complex with octadentate pyridine carboxylate ligands was described by Gutkina et al. [48]. However, the TONs for cyclohexane oxidation did not exceed 5.0 in the latter case. 

Heterostannenes, preparation and characteristics, 3, 870 Heterosubstituted arenes, metallation, 9, 17 Hexaaryldiplumbanes, preparation, 3, 887 Hexabutyldistannane, preparation, 3, 856 Hexacarbenes, in cobalt(III) complexes, 7, 19 Hexacarbonyl complexes, with molybdenum kinetics and reactivity, 5, 395 photochemistry, 5, 393 solid-support studies, 5, 394 spectroscopic and theoretical studies, 5, 392 Hexadentate iV-substituted triazacyclononane, synthetic applications, 1, 70... 

Graham, B., Spiccia, L., Bond, A.M., Hearn, M.T.W., and Kepert, C.M. Structural, sepctroscopic and electrochemical studies of nickel(II) sandwich complexes with ligands featuring tethered 1,4,7-triazacyclononane, Dalton Trans. (2001), 2232-2238. 

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