Crystallization of the \({\text{Mn}}^{{\text{II}}}[12{\text{-MC}}_{{\text{Mn}}^{{\text{III}}}{\text{(N)shi}}}{\text{-}}4]^{2+}\) Structure with 1,2,4-Triazolate from Methanol


The metallacrown (MC) dimer complex {MnII(OAc)(1,2,4-trz)\([12{\text{-MC}}_{{\text{Mn}}^{{\text{III}}}{\text{(N)shi}}}{\text{-}}4]\)(CH3OH)4.46(H2O)0.54}2·1.53CH3OH·6.47H2O, 1, where OAc is acetate, 1,2,4-trz is triazolate, and shi3− is salicylhydroximate, has been synthesized and characterized by single-crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P21/c with a = 10.9139(17) Å, b = 28.319(4) Å, c = 15.675(2) Å, α = 90.00°, β 93.362(3)°, γ = 90.00°, V = 4836.4(13) Å3, and Z = 2. The compound is an example of a \(12{\text{-MC}}_{{\text{Mn}}^{{\text{III}}}{\text{(N)shi}}}{\text{-}}4\) complex crystallized from methanol in the presence of a basic nitrogen-containing aromatic heterocycle. The dimer formation is a result of the two 1,2,4-triazolate anions being able to form N1, N2, N4-bridges between ring and central cavity manganese ions thus linking two neighboring MCs. An individual MC unit of 1 is nearly planar as evident from the average angle between the axial oxygen or nitrogen atoms, the ring MnIII ion, and the calculated centroid of the oxime oxygen atoms being 90.12° about the MC ring.

Graphical Abstract

This manuscript provides a structural description of a manganese-based MC dimer with the composition {MnII(OAc)(1,2,4-trz)\([12{\text{-MC}}_{{\text{Mn}}^{{\text{III}}}{\text{(N)shi}}}{\text{-}}4]\)(CH3OH)4.46(H2O)0.54}2 ·1.53CH3OH·6.47H2O, where two 1,2,4-triazolate (trz) anions bind in a N1,N2,N4 fashion and form bridges between two neighboring MCs

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This work was funded by The Shippensburg University Foundation UGR2012/13-06 to JCL and CMZ, and the diffractometer was funded by National Science Foundation Grant 0087210, by Ohio Board of Regents Grant CAP-491, and by YSU.

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The authors declare that they have no conflict of interest.

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Correspondence to Curtis M. Zaleski.

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Zaleski, C.M., Lutter, J.C. & Zeller, M. Crystallization of the \({\text{Mn}}^{{\text{II}}}[12{\text{-MC}}_{{\text{Mn}}^{{\text{III}}}{\text{(N)shi}}}{\text{-}}4]^{2+}\) Structure with 1,2,4-Triazolate from Methanol. J Chem Crystallogr 45, 142–150 (2015).

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  • Metallacrown
  • Manganese
  • Coordination complex
  • Triazole