[(Tmp)Co2L] Complexes through Preassembly on 2,6-Diformyl- and 2,6-Bis(benzylimino)-4-methylphenolate Templates

The reaction of the dinucleating ligand H3L {2-(2′-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine} with Co(OAc)2·4H2O and NaN3 in MeOH produces the methoxide-bridged dicobalt complex [CoIII2(μ-OMe)L(N3)2] (1) under aerobic conditions. If the reaction occurs in the presence of either 2,6-diformyl-4-methylphenolate (dfp–) or 2,6-bis(benzyliminomethyl)-4-methylphenolate (bip–), a preassembly of the [CoII2(OPh)]3+ units takes place on these templates before coordination with L3– in [CoII2(μ-dfp)L]·3H2O (2·3H2O) and [CoII2(μ-bip)L]·3H2O (3·3H2O), respectively. Incorporation of these coligands into the structure leads to stabilization of 3+ and 2+ oxidation states of the cobalt. In complex 2, the CoII ions are engaged in a weak antiferromagnetic interaction. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

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