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A Simple and Inexpensive Running Wheel Model for Progressive Resistance Training in Mice

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Wheel-shaped Mn16 single-molecule magnets.

Sonali J Shah¹, Christopher M Ramsey, Katie J Heroux

¹Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093, USA.

Inorganic Chemistry

|June 25, 2008

Summary

Two new manganese wheel complexes exhibit high-spin ground states and single-molecule magnet behavior. Complex 1 shows the highest spin for a single-stranded manganese wheel, indicating potential for advanced magnetic applications.

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Area of Science:

Inorganic Chemistry
Materials Science
Magnetochemistry

Background:

Single-stranded manganese wheels are of interest for their unique magnetic properties.
Understanding the relationship between structure and magnetic behavior is crucial for designing new magnetic materials.

Purpose of the Study:

To synthesize and characterize two novel hexadecanuclear manganese wheel complexes.
To investigate their structural and magnetic properties, including ground-state spin and single-molecule magnet (SMM) behavior.

Main Methods:

X-ray crystallography was used to determine the structures of the complexes.
Variable-temperature direct current (DC) magnetic susceptibility measurements were performed.
Variable-temperature variable-field DC magnetic susceptibility and AC susceptibility measurements were conducted.
Single-crystal magnetization hysteresis measurements were employed for complex 2.

Main Results:

Two hexadecanuclear manganese wheels, [Mn16(CH3COO)8(CH3CH2CH2COO)8(teaH)12] and [Mn16((CH3)2CHCOO)16(teaH)12], were synthesized and structurally characterized.
Both complexes exhibit high-spin ground states (S=13), with complex 1 possessing the highest reported spin for a single-stranded manganese wheel.
Complex 2 demonstrates single-molecule magnet behavior, confirmed by magnetization hysteresis and relaxation studies.

Conclusions:

The synthesized manganese wheels possess intriguing magnetic properties.
Complex 1 represents a significant advancement in high-spin single-stranded manganese wheels.
Complex 2 is confirmed as a single-molecule magnet, opening avenues for molecular magnetism research.