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 5 2020
Accepted
26 6 2020
First published
08 7 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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