Optical spectroscopy of Nd³⁺ions in poly(acrylic acid)

Abstract

Nd3+ dissolved in solid poly(acrylic acid) was synthesized by polymerization of the monomer partially neutralized with neodymium hydroxide in aqueous solution. The monomer modification and the coordination of ligands to Nd3+ were confirmed by 1H NMR spectroscopy. The measured oscillator strengths for transitions from the ground state to the main excited state manifolds compared favourably with calculated electric dipole oscillator strengths. The spontaneous emission rates, the fluorescence branching ratios and the stimulated emission cross sections of the , and transitions, as well as the radiative lifetime and the quantum efficiency of the 4F3/2 emitting level, were determined.

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

“…Figure 1 shows that the analysis by 1 H NMR spectroscopy further supported the success of the SDBS modi cation of (pullulan-g-poly (AA-co-AAm)). Besides the different carbons appearing at around 5.575-5.675 and 6.01-6.42 representing the Cis portion and trans portion of polyacrylic acid, those of the SAP-1 were converted to 5.590-5.685 and 5.99-6.28 ppm, these results agree with a previous study [42].In addition, the new chemical shifts for protons at the range of 0.85-1.5 ppm represented the pullulan, which converts to 0.85-1.52 after adding the SDBS at SAP-2, besides the peak at 2.53 ppm were characterized by the methylene groups(-CH2CH2-), and the range of peaks (6 to 7 ppm) for amino groups convert to 2.54 ppm and 6-7.6 ppm after adding the SDBS, respectively, these results agreed with previous studies [43,44].…”

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

“…Figure 1 shows that the analysis by 1 H NMR spectroscopy further supported the success of the SDBS modi cation of (pullulan-g-poly (AA-co-AAm)). Besides the different carbons appearing at around 5.575-5.675 and 6.01-6.42 representing the Cis portion and trans portion of polyacrylic acid, those of the SAP-1 were converted to 5.590-5.685 and 5.99-6.28 ppm, these results agree with a previous study [42].In addition, the new chemical shifts for protons at the range of 0.85-1.5 ppm represented the pullulan, which converts to 0.85-1.52 after adding the SDBS at SAP-2, besides the peak at 2.53 ppm were characterized by the methylene groups(-CH2CH2-), and the range of peaks (6 to 7 ppm) for amino groups convert to 2.54 ppm and 6-7.6 ppm after adding the SDBS, respectively, these results agreed with previous studies [43,44].…”

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

“…Figure 1 shows that analysis by 1 H NMR spectroscopy further supported the success of the SDBS modification of (pullulan-g-poly (AA-co-AAm)). In addition to the different carbons appearing at around 5.575-5.675 and 6.01-6.42, representing the Cis portion and Gels 2024, 10, 251 3 of 17 trans portion of polyacrylic acid, those of the SAP-1 were converted to 5.590-5.685 and 5.99-6.28 ppm; these results agree with a previous study [40]. In addition, the new chemical shifts for protons in the range of 0.85-1.5 ppm represented the pullulan, which converts to 0.85-1.52 after adding the SDBS at SAP-2, in addition to the peak at 2.53 ppm, characterized by the methylene groups(-CH 2 CH 2 -) and the range of peaks (6-7 ppm) for amino groups that convert to 2.54 ppm and 6-7.6 ppm after adding the SDBS.…”

Structural characterization and photoluminescence behavior of pure and doped potassium strontium niobates ceramics with tetragonal tungsten–bronze structure

“…It is important to emphasize that the UV-vis absorption spectra confirms the incorporation of Pr and Nd in the KSN host lattice because of their respective band edges ( Figures S5 and S6 in Supplementary Data). The wavelengths of these bands are nearly the same of the peaks found in the excitation spectra of other materials [29,33,34]. It is clear that the replacement of sites commonly occupied by Sr for those lanthanide atoms as well as the existence of uncountable structural defects in the crystalline lattice are sufficiently important to affect the lattice parameters and the electronic band structure.…”

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

“…Figure 1 shows that the analysis by 1 H NMR spectroscopy further supported the success of the SDBS modi cation of (pullulan-g-poly (AA-co-AAm)). Besides the different carbons appearing at around 5.575-5.675 and 6.01-6.42 representing the Cis portion and trans portion of polyacrylic acid, those of the SAP-1 were converted to 5.590-5.685 and 5.99-6.28 ppm, these results agree with a previous study [42].In addition, the new chemical shifts for protons at the range of 0.85-1.5 ppm represented the pullulan, which converts to 0.85-1.52 after adding the SDBS at SAP-2, besides the peak at 2.53 ppm were characterized by the methylene groups(-CH2CH2-), and the range of peaks (6 to 7 ppm) for amino groups convert to 2.54 ppm and 6-7.6 ppm after adding the SDBS, respectively, these results agreed with previous studies [43,44].…”

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

“…Figure 1 shows that analysis by 1 H NMR spectroscopy further supported the success of the SDBS modification of (pullulan-g-poly (AA-co-AAm)). In addition to the different carbons appearing at around 5.575-5.675 and 6.01-6.42, representing the Cis portion and Gels 2024, 10, 251 3 of 17 trans portion of polyacrylic acid, those of the SAP-1 were converted to 5.590-5.685 and 5.99-6.28 ppm; these results agree with a previous study [40]. In addition, the new chemical shifts for protons in the range of 0.85-1.5 ppm represented the pullulan, which converts to 0.85-1.52 after adding the SDBS at SAP-2, in addition to the peak at 2.53 ppm, characterized by the methylene groups(-CH 2 CH 2 -) and the range of peaks (6-7 ppm) for amino groups that convert to 2.54 ppm and 6-7.6 ppm after adding the SDBS.…”

Structural characterization and photoluminescence behavior of pure and doped potassium strontium niobates ceramics with tetragonal tungsten–bronze structure

“…It is important to emphasize that the UV-vis absorption spectra confirms the incorporation of Pr and Nd in the KSN host lattice because of their respective band edges ( Figures S5 and S6 in Supplementary Data). The wavelengths of these bands are nearly the same of the peaks found in the excitation spectra of other materials [29,33,34]. It is clear that the replacement of sites commonly occupied by Sr for those lanthanide atoms as well as the existence of uncountable structural defects in the crystalline lattice are sufficiently important to affect the lattice parameters and the electronic band structure.…”

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

“…Figure 1 shows that the analysis by 1 H NMR spectroscopy further supported the success of the SDBS modi cation of (pullulan-g-poly (AA-co-AAm)). Besides the different carbons appearing at around 5.575-5.675 and 6.01-6.42 representing the Cis portion and trans portion of polyacrylic acid, those of the SAP-1 were converted to 5.590-5.685 and 5.99-6.28 ppm, these results agree with a previous study [42].In addition, the new chemical shifts for protons at the range of 0.85-1.5 ppm represented the pullulan, which converts to 0.85-1.52 after adding the SDBS at SAP-2, besides the peak at 2.53 ppm were characterized by the methylene groups(-CH2CH2-), and the range of peaks (6 to 7 ppm) for amino groups convert to 2.54 ppm and 6-7.6 ppm after adding the SDBS, respectively, these results agreed with previous studies [43,44].…”

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

“…Figure 1 shows that analysis by 1 H NMR spectroscopy further supported the success of the SDBS modification of (pullulan-g-poly (AA-co-AAm)). In addition to the different carbons appearing at around 5.575-5.675 and 6.01-6.42, representing the Cis portion and Gels 2024, 10, 251 3 of 17 trans portion of polyacrylic acid, those of the SAP-1 were converted to 5.590-5.685 and 5.99-6.28 ppm; these results agree with a previous study [40]. In addition, the new chemical shifts for protons in the range of 0.85-1.5 ppm represented the pullulan, which converts to 0.85-1.52 after adding the SDBS at SAP-2, in addition to the peak at 2.53 ppm, characterized by the methylene groups(-CH 2 CH 2 -) and the range of peaks (6-7 ppm) for amino groups that convert to 2.54 ppm and 6-7.6 ppm after adding the SDBS.…”

Structural characterization and photoluminescence behavior of pure and doped potassium strontium niobates ceramics with tetragonal tungsten–bronze structure

“…It is important to emphasize that the UV-vis absorption spectra confirms the incorporation of Pr and Nd in the KSN host lattice because of their respective band edges ( Figures S5 and S6 in Supplementary Data). The wavelengths of these bands are nearly the same of the peaks found in the excitation spectra of other materials [29,33,34]. It is clear that the replacement of sites commonly occupied by Sr for those lanthanide atoms as well as the existence of uncountable structural defects in the crystalline lattice are sufficiently important to affect the lattice parameters and the electronic band structure.…”