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Two segregated columnar stack platinum-bis-dithiolene molecule solids showing spin-Peierls-type transition above room
Wei-Hua Ning1, Xuan-Rong Chen, Jian-Lan Liu
1State Key Laboratory of Materials-Oriented Chemical Engineering and College of Science, Nanjing University of Technology, Nanjing 210009, China.
Dalton Transactions (Cambridge, England : 2003)
|December 20, 2013
Summary
Two new 1-D compounds, [CH3-BzPy][Pt(mnt)2] and its deuterated analog, exhibit a spin-Peierls-type transition around 320 K. Unlike nickel analogues, deuteration does not significantly alter the transition temperature in these platinum compounds.
Area of Science:
- Materials Science
- Solid State Chemistry
- Condensed Matter Physics
Background:
- One-dimensional (1-D) materials offer unique electronic and magnetic properties.
- Spin-Peierls transitions are a key phenomenon in 1-D systems, involving a transition from a magnetic to a non-magnetic state.
- Deuteration can influence phase transition temperatures in materials due to changes in vibrational frequencies and lattice interactions.
Purpose of the Study:
- Synthesize and characterize two new 1-D platinum-based compounds: [CH3-BzPy][Pt(mnt)2] (1) and [CH3-BzPy-d5][Pt(mnt)2] (2).
- Investigate the magnetic behavior and phase transitions of these compounds.
- Compare the effect of deuteration on the spin-Peierls transition temperature in platinum versus nickel analogues.
Main Methods:
- Synthesis and characterization of novel 1-D coordination compounds.
- Magnetic susceptibility measurements from 1.8 K to 400 K.
- X-ray crystallography to determine crystal structures in both high-temperature (HT) and low-temperature (LT) phases.
- Differential Scanning Calorimetry (DSC) to identify phase transition temperatures.
Main Results:
- Compounds 1 and 2 exhibit similar magnetic behavior, including antiferromagnetic S=1/2 chain behavior in the HT phase and a spin gap in the LT phase.
- A spin-Peierls-type transition occurs around 320 K, accompanied by a symmetry-breaking structural phase transition.
- Crystallographic data confirmed structural changes associated with the phase transition, with distinct space groups for HT (P2(1)/c) and LT (P1[combining macron]) phases.
- DSC measurements showed that deuteration in [CH3-BzPy-d5][Pt(mnt)2] (2) did not significantly shift the transition temperature (T(C)), contrasting with related nickel compounds.
Conclusions:
- The synthesized platinum compounds undergo a spin-Peierls transition with associated structural changes.
- Deuteration has a negligible effect on the spin-Peierls transition temperature in these [Pt(mnt)2]-based systems.
- This finding highlights a difference in the influence of deuteration on spin-Peierls transitions between platinum and nickel analogues, suggesting system-specific effects.
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