Issue 28, 2020

With complements of the ligands: an unusual S-shaped [Mn7]2 assembly from tethered calixarenes

Abstract

The reaction between MnCl2·4H2O, 2,2′-bis-p-tBu-calix[4]arene (H8L1) and 2-(hydroxymethyl)pyridine (hmpH) in a basic dmf/MeOH solution results in the formation of the complex [MnIII10MnII4(L1)3(hmp)43-O)43-OH)2(MeOH)4(dmf)6](dmf)4 (6) upon vapour diffusion of petroleum ether into the mother liquor. The crystals are in the monoclinic space group C2/c, with the asymmetric unit (ASU) comprising one half of the molecule. The structure describes a large S-shaped cluster (∼40 Å top to tail) where the unusual syn and anti conformations of the calixarene ligands results in two binding pockets each containing a [MnIII5MnII2] moiety comprised of two perpendicular, vertex-sharing [Mn4] butterflies. One butterfly possesses a [MnIII4O4] core and the second a [MnIII2MnII2O3] unit with the MnII ions in the central body positions. Magnetic susceptibility and magnetisation measurements reveal weak exchange interactions between the metal centres.

Graphical abstract: With complements of the ligands: an unusual S-shaped [Mn7]2 assembly from tethered calixarenes

Supplementary files

Article information

Article type
Paper
Submitted
16 mei 2020
Accepted
26 jun 2020
First published
08 jul 2020
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2020,49, 9882-9887

With complements of the ligands: an unusual S-shaped [Mn7]2 assembly from tethered calixarenes

M. Coletta, S. Sanz, E. K. Brechin and S. J. Dalgarno, Dalton Trans., 2020, 49, 9882 DOI: 10.1039/D0DT01766C

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