Two nd-zn and sm-zn isonicotinic/nicotinic Acid complexes

Area of Science:

• Inorganic Chemistry
• Materials Science
• Coordination Chemistry

Background:

• Heterometallic complexes integrating lanthanide and transition metals offer unique properties.
• Lanthanide ions like Neodymium (Nd) and Samarium (Sm) are known for their distinct luminescent behaviors.
• Hydrothermal synthesis provides a versatile route for creating complex inorganic structures.

Purpose of the Study:

• To synthesize and structurally characterize novel 4f-3d heterometallic complexes.
• To investigate and compare the photoluminescent properties of the synthesized Nd(III) and Sm(III) complexes.
• To elucidate the origins of the observed luminescence in each complex.

Main Methods:

• Hydrothermal reactions were employed for the synthesis of the complexes.
• X-ray single-crystal diffraction was used for detailed structural characterization.
• Photoluminescence spectroscopy was utilized to study the emission characteristics.

Main Results:

• Two 1-D polycationic chain-like heterometallic complexes, [Nd(L)3(H2O)2]2(ZnCl4)3n • 4nH2O (1) and [Sm(L')3(H2O)2]2(ZnCl4)n • 2nH2O (2), were successfully synthesized (L=isonicotinic acid, L'=nicotinic acid).
• Complex 1 displayed emission attributed to π → π* charge-transfer interactions of the isonicotinic acid ligand.
• Complex 2 exhibited broad-range emissions, ascribed to characteristic 4G5/2 → 6HJ transitions of Sm3+ ions.

Conclusions:

• The successful synthesis and structural elucidation of novel Nd(III) and Sm(III) heterometallic complexes were achieved.
• The photoluminescent behavior of the complexes differs significantly, influenced by both the metal ions and organic ligands.
• These findings contribute to the understanding of structure-property relationships in lanthanide-based coordination compounds.