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Density-Functional Theory Study of the Stereochemistry of Chloroiron(III) and Chloromanganese(III) Complexes of a Bridled Chiroporphyrin

Published inInorganic chemistry, vol. 48, no. 12, p. 5164-5176
Publication date2009
Abstract

Transition metal complexes of chiroporphyrins, in which two adjacent meso substituents are linked by a strap of eight methylene groups, [M(BCP8)], can exist as either an αααα or αβαβ atropisomer depending on the nature of the coordinated metal cation. This remarkable conformational versatility was investigated by density-functional theory calculations for the d5 chloroiron(III) complex in the low-spin and high-spin states and for the d4 high-spin chloromanganese(III) complex. The lowest-lying electronic state of all of the conformers of the chloroiron(III) bridled chiroporphyrin is found to be the high-spin state. For the chloroiron(III) complex in the low-spin or the high-spin state and for the high-spin chloromanganese(III) complex, the most stable form is predicted to be the αααα conformer in which the chloride axial ligand is located within the cavity provided by the bridles. The predicted stereochemistries are compared with those similarly obtained (i) for the chloroiron(III) and chloromanganese(III) complexes of the tetramethylchiroporphyrin, which is devoid of straps, and (ii) for the d10 zinc(II) and low-spin d8 nickel(II) BCP8 complexes, on the basis of the effects tied to the occupancy of the stereochemically active dx2−y2-type antibonding orbital level, to the restraints imposed by the straps, and to the presence of the axial chloride ligand.

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LAWSON DAKU, Latevi Max, CASTAINGS, Anna, MARCHON, Jean-Claude. Density-Functional Theory Study of the Stereochemistry of Chloroiron(III) and Chloromanganese(III) Complexes of a Bridled Chiroporphyrin. In: Inorganic chemistry, 2009, vol. 48, n° 12, p. 5164–5176. doi: 10.1021/ic900031c
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ISSN of the journal0020-1669
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