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Issue 18, 2020
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Structural studies of a manganese(iii) complex with spin-crossover and thermochromic properties

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Abstract

Thermochromism and gradual spin crossover (SCO) were observed in the [MnIII(5-MeO-sal-N-1-5-8-12)]Cl complex. The transition temperature (T1/2) was determined to be 281 K by the drastic changes in the unit cell. This T1/2 value is the highest observed for this type of system using the 5-MeO-H2sal-N-(1-5-8-12) ligand. The gradual transition was monitored by single crystal X-ray diffraction at four temperatures (100 K, 290 K, 350 K and 400 K), and the octahedral deviation parameters were obtained to classify the spin state. Moreover, the unit cell parameters were determined at 12 different temperatures from 90 K to 400 K, and significant changes were observed in the unit cell from 250 K to 310 K, corresponding to the low-spin (LS) state to high-spin (HS) state transition or vice versa. Thermochromism in the solid state was observed at cryogenic temperatures, starting at 250 K on a single-crystal sample, representing clear evidence of the electronic transition. This work opens further opportunities to design and synthesize new SCO profiles for MnIII complexes using Schiff base derivatives.

Graphical abstract: Structural studies of a manganese(iii) complex with spin-crossover and thermochromic properties

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Supplementary files

Article information


Submitted
12 Dec 2019
Accepted
31 Mar 2020
First published
31 Mar 2020

CrystEngComm, 2020,22, 3221-3233
Article type
Paper

Structural studies of a manganese(III) complex with spin-crossover and thermochromic properties

D. Villaman, C. J. McMonagle, M. R. Probert, O. Peña, Y. Moreno and M. Fuentealba, CrystEngComm, 2020, 22, 3221 DOI: 10.1039/C9CE01962F

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