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Constructing "Closed" and "Open" {Mn8} Clusters.

ABSTRACT: Use of the 1,3,5-tri(2-hydroxyethyl)-1,3,5-triazacyclohexane ligand, LH3, in manganese chemistry affords access to two structurally related {Mn8} clusters: a "closed" {MnIII 6MnII 2} puckered square wheel of formula [Mn8L2(LH)O3(OH)2(MeO)2Br(imH)(H2O)3](Br)3 (1; imH = imidazole) and an "open" {MnIII 8} rod of formula [MnΙΙΙ 8L2O4(aibH)2(aib)2(MeO)6(MeOH)2](NO3)2 (2, aibH = 2-amino-isobutyric acid). In each case the triaza ligands, L/LH, direct the formation of {Mn3} triangles with their N atoms preferentially bonding to the Jahn-Teller axes of the MnIII ions. Subsequent self-assembly is dependent on the anion of the Mn salt and the identity of the organic coligand employed-the terminally bonded imidazole and the chelating/bridging amino acid. The {Mn3} triangles fold up on themselves in 1, forming a wheel. However, the syn, syn-bridging carboxylates in 2 prevent this from happening, instead directing the formation of a linear rod. Magnetic susceptibility and magnetization measurements reveal competing ferro- and antiferromagnetic interactions in both complexes, the exchange being somewhat weaker in 1 due to the presence of MnII ions.

SUBMITTER: Tziotzi TG 

PROVIDER: S-EPMC9374326 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

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Constructing "Closed" and "Open" {Mn<sub>8</sub>} Clusters.

Tziotzi Thomais G TG   Mavromagoulos Athanasios A   Murrie Mark M   Dalgarno Scott J SJ   Evangelisti Marco M   Brechin Euan K EK   Milios Constantinos J CJ  

Crystal growth & design 20220705 8

Use of the 1,3,5-tri(2-hydroxyethyl)-1,3,5-triazacyclohexane ligand, LH<sub>3</sub>, in manganese chemistry affords access to two structurally related {Mn<sub>8</sub>} clusters: a "closed" {Mn<sup>III</sup> <sub>6</sub>Mn<sup>II</sup> <sub>2</sub>} puckered square wheel of formula [Mn<sub>8</sub>L<sub>2</sub>(LH)O<sub>3</sub>(OH)<sub>2</sub>(MeO)<sub>2</sub>Br(imH)(H<sub>2</sub>O)<sub>3</sub>](Br)<sub>3</sub> (<b>1</b>; imH = imidazole) and an "open" {Mn<sup>III</sup> <sub>8</sub>} rod of formul  ...[more]

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