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Two isostructural triboluminescent lanthanide complexes.

W Clegg¹, I Sage, I Oswald

¹Department of Chemistry, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU, England. w.clegg@ncl.ac.uk

Acta Crystallographica. Section C, Crystal Structure Communications

|November 15, 2000

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New terbium(III) and samarium(III) complexes exhibit piezoelectric properties for potential use in damage sensors. Their unique structure and triboluminescence offer insights into material science applications.

Area of Science:

Coordination Chemistry
Materials Science
Solid-State Physics

Background:

Lanthanide complexes with diketonate and pyridine ligands are explored for unique optical and electronic properties.
Triboluminescence (TL) and second harmonic generation (SHG) are phenomena linked to non-centrosymmetric crystal structures.
Piezoelectric effects in materials are crucial for sensor development.

Purpose of the Study:

To synthesize and characterize isostructural lanthanide complexes of terbium(III) and samarium(III).
To investigate the relationship between crystal structure, piezoelectricity, and triboluminescence in these complexes.
To assess their potential for application as damage sensors in composite materials.

Main Methods:

Single-crystal X-ray diffraction to determine the isostructural nature and coordination geometry.

Related Experiment Videos

Polarized light microscopy and luminescence spectroscopy to study optical properties.

Triboluminescence measurements to evaluate light emission under mechanical stress.

Main Results:

The synthesized complexes, [Tb(C11H19O2)3(C7H10N2)] and [Sm(C11H19O2)3(C7H10N2)], were confirmed to be isostructural with irregular seven-coordination.
Observed second harmonic generation and intense triboluminescence are consistent with their polar space group and piezoelectric charging.
Metal-ligand bond lengths indicate shorter Tb-ligand bonds compared to Sm-ligand bonds.

Conclusions:

The studied lanthanide complexes possess piezoelectric properties suitable for triboluminescence.
Their structural and optical characteristics make them promising candidates for developing advanced damage sensors.
Further research can explore their integration into composite materials for structural health monitoring.