Constructing “closed” and “open” {Mn8} clusters

Tziotzi, T. G., Mavromagoulos, A., Murrie, M. , Dalgarno, S. J., Evangelisti, M., Brechin, E. K. and Milios, C. J. (2022) Constructing “closed” and “open” {Mn8} clusters. Crystal Growth and Design, 22(8), pp. 4935-4940. (doi: 10.1021/acs.cgd.2c00489)

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” {MnIII6MnII2} puckered square wheel of formula [Mn8L2(LH)O3(OH)2(MeO)2Br(imH)(H2O)3](Br)3 (1; imH = imidazole) and an “open” {MnIII8} rod of formula [MnΙΙΙ8L2O4(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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Murrie, Professor Mark and Mavromagoulos, Athanasios
• Authors: Tziotzi, T. G., Mavromagoulos, A., Murrie, M., Dalgarno, S. J., Evangelisti, M., Brechin, E. K., and Milios, C. J.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Crystal Growth and Design
• Publisher: American Chemical Society
• ISSN: 1528-7483
• ISSN (Online): 1528-7505
• Published Online: 05 July 2022
• Copyright Holders: Copyright © 2022 The Authors
• First Published: First published in Crystal Growth and Design 22(8): 4935-4940
• Publisher Policy: Reproduced under a Creative Commons licence