Designing of emerald terbium (III) ions with β‐ketocarboxylic acid and heterocyclic ancillary ligands for biological and optoelectronic applications

Abstract

A green and highly efficient grinding method was adopted to synthesize emerald terbium complexes with 1-cyclopropyl-6-fluro-4-oxo-7-piperazin-1-ylquinoline-3-carboxylic acid as the main organic ligand and 2,2 0 -bipyridyl, 1,10-phenanthroline, neocuproine, 5,6-dimethyl-1,10-phenanthroline and bathophenanthroline as ancillary ligands. Structural analysis of these complexes was executed via elemental, infrared and 1 H-nuclear magnetic resonance analysis, which confirmed that the ligand coordinated to the metal ion through β-ketone and hydroxyl groups of carboxylic acid.Thermal stability of these complexes was investigated by study of thermogravimetric/derivative thermogravimetric analysis. Photoluminescence properties were investigated by observing emission spectra (400-700 nm), excitation spectra (250-500 nm) and decay time curves for display devices. The emission spectra revealed that an intense peak at 545 nm was observed due to 5 D 4 ! 7 F 5 electronic transition, which is responsible for the emerald colour in synthesized complexes, under 353 nm ultraviolet light excitation. The energy band gap and refractive index were determined, which proclaimed the dormant applications of these complexes in semiconductors. Commission Internationale de l'éclairage colour coordinates confirmed that the emerald emission of these complexes lies in the green region. Furthermore, antioxidant, antimicrobial and antimalarial assays of these complexes were also investigated, which confirmed that these complexes are potent for antioxidant, antimicrobial and antimalarial activities.

Augmentation of photophysical features and Judd–Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands

“…Moreover, a prominent parameter CCT (correlated color parameter) was figured out to investigate the nature and quality of light radiated from the source. CCT might be quantified by implementing the Mc-Camy equation and observed values of CCT, ascertained the nature of complexes as either cool or warm or neutral light source [3]: wherein n may be prescribed as follows:…”

“…Nowadays, lanthanide complexes are rapidly acquiring popularity due to their fabulous applications such as organic light-emitting diodes (OLEDs), flat lighting displays, biomedical analysis, coordination chemistry, fluorescence labels, and electroluminescence due to unique photophysical properties such as high color purity, long lifetime, sharp line like emission, and large stoke's shift [1][2][3][4]. Among lanthanides, especially europium, terbium, and samarium complexes have unique photophysical properties caused by intraconfigurational f-f transitions between emissive levels [5].…”

Photophysical, optical and lasing analysis of fluorinated β-keto carboxylate europium(III) complexes

“…The prominent frequencies of spectra are enlisted in table 2. The spectrum of CDFA displayed, two sharp bands at 3530 and 3470 cm −1 corresponding to ν(-OH carboxylic) and ν(-NH) respectively, but these bands are superseded by the broad and intense band in the range of 3150-3600 cm −1 in spectra of complexes, which corresponds to the overlapped band of -NH stretch of ligand with -OH stretch of aqua molecules present in complexes [18][19][20]. A sharp band at 1620 cm -1 in spectrum of ligand, is assigned to the ν(C=O) stretch of carbonyl group [21,22] but it is red shifted toward lower frequencies region between 1570-1575 cm −1 in spectra of complexes, which justified the involvement of the ketonic group in complexation [21].…”

Computational analysis, Urbach energy and Judd–Ofelt parameter of warm Sm3+complexes having applications in photovoltaic and display devices

“…The strains were mixed by vortex and then incubated in an incubator without agitation. 35 The minimum concentration of antimicrobial agents that inhibit the microorganism growth was determined in terms of MIC values expressed in micrograms per millilitre.…”