1,4,7-Triazacyclononane , highly

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." ... 

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. 

Hajela, S., Schaefer, W.P., and Bercaw, J.E. (1997) Highly electron deficient group 3 organometalUc complexes based on the l,4,7-trimethyl-l,4,7-triazacyclononane Ugand system. Journal of Organometallic Chemistry, 532, 45. 

Fish reported that a Zn(ll)-imprinted resin, containing a sandwich arrangement of the well known 1,4,7-triazacyclononane (TACN) ligand, was found to be highly selective toward reintroduced Cu(II) in the presence of Fe(lll), Co(II), Ni(II), Zn(II) and Mn(II), after the removal of the Zn(II) template with 6 N HCl [36]. The following parameters were addressed structures of the monomers of the A-(4-vinyl-benzyl)TACN-Zn(II) complexes, polymerisation parameters, structure of the polymer TACN-template metal ion complex and selectivity to reintroduced metal... 

LPr= l-isopropyl-4,7-bis(4-tert-butyl-2-thiobenzyl)-l,4,7-triazacyclononane),49 and studied by magnetic susceptometry, Mossbauer spectroscopy, and theoretical tools, constitutes the first example of this kind of behavior in FeNO 7 compounds. The S= 1/2 valence tautomer was described as a low-spin Fe11 (S = 0) bound to a NO radical, whereas the S =3/2 isomer involved a high-spin Fe111 (S= 5/2), antiferromagnetically coupled to NO (S 1). 

A few other complexes with N-N coordinating atoms have been tested as olefin polymerization catalysts. The aminopyridinato complex 181 is only able to oligomerize propylene and 1-butene (Mn < 3500) with low activity.1222 The /3-diketiminato Zr complex 182 exhibits moderate ethylene polymerization activity ( 50gPE(mmol M)-1 h-1 bar-1), but molecular masses were disappointingly low (Mn up to 30000).1117 Finally, at 100°C, the MAO-activated Ti complex 183, with a tridentate triazacyclononane ligand, yields PE with very high activity (104gPE(mmol M)-1 h-1 bar-1) but rather low molecular masses and broad polydispersity (Mn = 39500 Mw/Mn = 7.0).1223... 

---