Journal
CRYSTENGCOMM
Volume 23, Issue 31, Pages 5306-5313Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ce00680k
Keywords
-
Categories
Funding
- National Nature Science Foundation of China [21761013, 21671086, 21461010, 21471070]
- Science and Technology Bureau project of Ganzhou
Ask authors/readers for more resources
A novel metal-free compound [H-2(bpyp)][ClO4](2) (1) has been synthesized successfully, showing a reversible phase transition with a moderate ferroelectric polarization and small coercive field. The phase transition behavior, characterized by DSC and single crystal diffraction measurements, is induced by the motion of cations and anions. The compound also exhibits significant second harmonic generation switching response and potential applications in switchable dielectric elements.
In this paper, a novel metal-free compound, [H-2(bpyp)][ClO4](2) (1) (bpyp = 1,3-bis(4-pyridyl)propane), has been successfully synthesized. It undergoes a reversible phase transition at around T-c = 256.19 K (T-c is the Curie temperature). Compound 1 shows a moderate ferroelectric polarization (P-s) of about 0.13 mu C cm(-2) and a coercive field (E-c) as small as 0.65 kV cm(-1). The phase transition behavior of compound 1 is well characterized by differential scanning calorimetry (DSC) and variable temperature single crystal diffraction measurements. The displacement and rotational reorientation motion of H-2(bpyp)(2+) cations and ClO4- anions induce the phase transition of compound 1 from the non-polar space group P2(1)2(1)2 (No. 18) to the polar space group P2(1) (No. 4). The significant second harmonic generation (SHG) switching response further demonstrates the symmetry breaking from P2(1)2(1)2 to P2(1). In particular, a dielectric study exhibits that the dielectric anomaly of compound 1 increases by 3-6 times at the phase transition temperature, which indicates its potential applications in switchable dielectric elements. Meanwhile, compound 1 shows semiconducting properties with a wide optical bandgap of similar to 4.47 eV. This finding suggests that metal-free compounds can be used in environmentally-friendly phase transition materials, contributing to the exploration of ferroelectric-dielectric and nonlinear optical (NLO) switching materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available