Modulation of Mn3+ Spin State by Guest Molecule Inclusion

Irina A. Kühne, Kane Esien, Laurence C. Gavin, Helge Müller-Bunz, Solveig Felton, Grace G. Morgan

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Abstract

Spin state preferences for a cationic Mn3+ chelate complex in four different crystal lattices are investigated by crystallography and SQUID magnetometry. The [MnL1]+ complex cation was prepared by complexation of Mn3+ to the Schiff base chelate formed from condensation of 4-methoxysalicylaldehyde and 1,2-bis(3-aminopropylamino)ethane. The cation was crystallized separately with three polyatomic counterions and in one case was found to cocrystallize with a percentage of unreacted 4-methoxysalicylaldehyde starting material. The spin state preferences of the four resultant complexes [MnL1]CF3SO3·xH2O, (1), [MnL1]PF6·xH2O, (2), [MnL1]PF6·xsal·xH2O, (2b), and [MnL1]BPh4, (3), were dependent on their ability to form strong intermolecular interactions. Complexes (1) and (2), which formed hydrogen bonds between [MnL1]+, lattice water and in one case also with counterion, showed an incomplete thermal spin crossover over the temperature range 5-300 K. In contrast, complex (3) with the BPh4-, counterion and no lattice water, was locked into the high spin state over the same temperature range, as was complex (2b), where inclusion of the 4-methoxysalicylaldehyde guest blocked the H-bonding interaction.

Original languageEnglish
Article number5603
Number of pages13
JournalMolecules (Basel, Switzerland)
Volume25
Issue number23
DOIs
Publication statusPublished - 28 Nov 2020

Bibliographical note

Copyright:
This record is sourced from MEDLINE/PubMed, a database of the U.S. National Library of Medicine

Keywords

  • guest inclusion
  • hexadentate
  • Mn3+
  • Schiff base
  • spin crossover
  • supramolecular

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry

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