Urbach and Judd-Ofelt analysis of crystalline samarium (III) complexes with β-ketocarboxylate and nitrogen donor secondary ligands

Abstract

The scarlet Sm (III) complexes with eight coordination number, as favoured by EDAX and elemental analytical data, were synthesized with fluorinated β-keto carboxylic acid as primary ligand and neo, batho, phen, dmph, and bypy as secondary ligand. Binary and ternary complexes of Sm(III) ion [Sm(ligand)32H2O], [Sm(ligand)3secondary ligand] respectively were prepared by one-step grinding method. The complexes exhibit crystalline character, nanoparticle size and outstanding thermal stability, they also have high color purity and as warm orange light sources. In UV visible light, complexes display several characteristic emission transitions such as (4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2) under the excitation of Sm (III) ion. The scarlet luminescence in UV domain is accredited to the 4G5/2 → 6H7/2 transition at 605 nm wavelength. The proton NMR and FT-IR data are reliable with coordination behavior of organic ligand and secondary ligand with Sm(III) ion. To understand the semiconducting nature, materiality in solar cell and photovoltaic devices with the help of HOMO- LUMO bandgap analysis and Urbach energy were examined. The calculated Judd-Ofelt parameter is a crucial aspect to describe the rigidity and symmetry of complexes. The anti-microbial investigation demonstrated that all complexes are practically applicable in bioassays.