Manganese (III) cyclam complexes with aqua, iodo, nitrito, perchlorato and acetic acid/acetato axial ligands

Susanne Mossin, Henning Osholm Sørensen, Høgni Weihe, Jørgen Glerup, Inger Søtofte

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The syntheses, structures and magnetic properties of five new manganese (III) cyclam complexes, trans-[Mn(cyclam)(OH2)(2)]-(CF3SO3)(3)center dot-H2O, trans-[Mn(cyclam)I-2]I, trans-[Mn(cyclam)(ONO)(2)]ClO4, trans-[Mn(cyclam)(OClO3)(2)]ClO4 and trans-[Mn(cyclam) (CH3COO)(CH3COOH)](ClO4)(2), are reported. Cyclam is the tetradentate amine ligand 1,4,8,11-tetraazacyclotetradecane. The complexes all exhibit pronounced tetragonal elongation of the coordination octahedron with the four cyclam nitrogens occupying the four equatorial positions. The magnetic properties are consistent with the formulation of the complexes as high-spin d(4) systems. trans-[Mn(cyclam)(OH2)(2)](CF3SO3)(3)center dot H2O is shown to be a convenient starting material for the syntheses of trans cyclam complexes. [Mn(cyclam)(CH3COO)(CH3COOH)](ClO4)(2) exhibits extremely short intermolecular hydrogen bonds resulting in a pseudo-chain structure. The tilt of the axial ligands with respect to the equatorial plane containing the manganese and the cyclam nitrogen atoms is discussed.
Original languageEnglish
JournalINORGANICA CHIMICA ACTA
Volume358
Issue number4
Pages (from-to)1096-1106
ISSN0020-1693
Publication statusPublished - 2005

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