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DOI: 10.1039/A805555F (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 31-42

Further attempts to rationalise the co-ordination chemistry of manganese with Schiff base ligands and supplementary carboxylate donors

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Michael Watkinson, Matilde Fondo, Manuel R. Bermejo, Antonio Sousa, Charles A. McAuliffe, Robin G. Pritchard, Nongnuj Jaiboon, Nadeem Aurangzeb and Mohammed Naeem

Abstract

Some manganese(III) complexes of Schiff base ligands with ancillary carboxylate donors have been found to exhibit structural diversity, although some patterns emerged. Thus, when the ligands 3CH3O-salen and 3CH3O-salpn [3CH3O-salen = dianion of N,N[hair space]′-bis(3-methoxysalicylidene)ethane-1,2-diamine, 3CH3O-salpn = dianion of N,N[hair space]′-bis(3-methoxysalicylidene)propane-1,3-diamine] are used in conjunction with carboxylates RCO2– (R = Me, Et, Prn or CH2Ph) unidentate carboxylate bonding occurs as in the crystallographically observed [Mn(3CH3O-salen)(O2CMe)(H2O)]·2H2O 1, [Mn(3CH3O-salen)(O2CCH2Ph)(H2O)]·H2O 4, and [Mn(3CH3O-salpn)(O2CCH2Ph)(H2O)] 5. On the other hand, employing the more sterically encumbered carboxylates ButCO2– and PriCO2–, bidentate chelating binding of the carboxylate occurs, as in [Mn(3CH3O-salpn)(O2CBut)] 2 and [Mn(3CH3O-salpn)(O2CPri)] 3. The reactivity of [Mn(salpn)(acac)] (acac = acetylacetonate) with Me3SiCl and aliphatic carboxylic acids, RCO2H (R = Me, Et, Prn, Bun, Pri or But), has also been investigated. A dimer species [{Mn(salpn)Cl}2]·CH3CN 6 was isolated from the reaction of Me3SiCl with [Mn(salpn)(acac)] while the carboxylic acids seem to lead to the isolation of monomers, such as [Mn(salpn)(O2CPri)] 7. This synthetic route has also been applied to the preparation of related complexes, in which the manganese(III) centre is not attainable with reliability via the aerobic oxidation of a manganese(II) precursor, although some rare examples have been obtained by the latter method, such as [Mn(5NO2-salen)(O2CMe)(H2O)], 8, [5NO2-salen = dianion of N,N[hair space]′-bis(5-nitrosalicylidene)ethane-1,2-diamine]). Single crystals were grown from a dimethylformamide solution of the material of stoichiometry Mn(3Br,5NO2-salpn)(O2CMe)·H2O [3Br,5NO2-salpn = dianion of N,N[hair space]′-bis(3-bromo-5-nitrosalicylidene)propane-1,3-diamine], isolated from this route and found to consist of the unexpected [{Mn(µ-3Br,5NO2-salpn)(µ-O)}2]·3DMF 9, apparently containing a manganese(IV) species, in spite of the electron withdrawing nature of the substituents on the aromatic rings of the ligand.

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