Related Experiment Video
Updated: Aug 19, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
[Pressure-tuning infrared spectral study on the single-molecule-magnet manganese complexes]
Zhen-hua Xu1, Zhi-da Chen, Ian S Butler
1The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Abstract:
The infrared spectra (IR) of single-molecule-magnet manganese complexes [Mn12O12 (O2CC6H4-3-Cl)16 (H2O)3 (3ClC6H4COH)].(3-Cl-C6H4CO2H)(I) and [Mn12O12(O2CCH2Br)16 (H2O)4]x4(CH2Cl2)(II) were studied at high external pressure. The different pressure-induced phase transition pressures were observed for both complexes (complex I, 25-29 kbar) and (complex II, 29-35 kbar). Both were second-order pressure-induced phase transition. The possible changes from higher spin to lower spin happened near the phase transition pressure following the changes of their structures when undergoing the high pressures. The average value of pressure sensitivities in the low-pressure phase is unusually smaller (0.19 cm(-1) x kbar(-1)) than in the high-pressure phase (0.29 cm(-1) x kbar(-1)) in the complex I. On the contrary, the average value of the pressure sensitivities in the low-pressure phase is higher (0.34 cm(-1) x kbar(-1)) than in the high-pressure phase (0.23 cm(-1) x kbar(-1)) in the complex II as usually, which means that the possibility of compression is lower in the high-pressure phase than in the low-pressure phase.
Related Concept Videos
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
