Effect of doping an organic molecule ligand on TGS single crystals

Krishnakumar, V.; Sivakumar, S.; Nagalakshmi, R.; Bhuvaneswari, S.; Rajaboopathi, M.

doi:10.1016/j.saa.2007.11.039

Cited by 18 publications

(11 citation statements)

References 29 publications

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“…These four internal vibrations occur at almost the same wavenumbers in the FTIR and Raman spectra. − For the present system, these vibrations were observed at ν 1 = 990 cm –1 , ν 2 = 351 cm –1 , ν 3 = 1058 cm –1 , and ν 4 = 515 cm –1 in the Raman spectrum. This is consistent with earlier reports. , Comparison of the FTIR and Raman spectra clearly shows that the asymmetric modes (ν 3 and ν 4 ) are active in the IR spectra. The asymmetric stretching mode (ν 3 ) associated with the O–H out-of-plane bending vibration is observed at 1091 cm –1 in the FTIR spectrum and occurs at 1058 cm –1 in the Raman spectrum.…”

Section: Results and Discussionsupporting

confidence: 93%

“…The UV–vis–NIR spectrum of 2,6-DAPPh measured in aqueous solution is presented in Figure . It exhibits two absorption peaks at 240 and 330 nm for the n−π*- and π–π*-type transitions, respectively, induced by the UV light irradiation . The absorption peaks of 2,6-DAP in methanol were found to be at 245 and 309 nm .…”

Section: Results and Discussionmentioning

confidence: 97%

“…This is consistent with earlier reports. 52,53 Comparison of the FTIR and Raman spectra clearly shows that the asymmetric modes (ν 3 and ν 4 ) are active in the IR spectra. The asymmetric stretching mode (ν 3 ) associated with the O−H out-of-plane bending vibration is observed at 1091 cm −1 in the FTIR spectrum and occurs at 1058 cm −1 in the Raman spectrum.…”

Section: Methodsmentioning

confidence: 99%

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Fluorescence Properties Reinforced by Proton Transfer in the Salt 2,6-Diaminopyridinium Dihydrogen Phosphate

et al. 2014

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Luminescent materials have many interesting applications, but it remains difficult to control the luminescence of organic materials and in particular to retain the same luminescence in solution and in the solid state, a property of interest for various imaging applications. In the present work, the fluorescent properties of the salt of 2,6-diaminopyridinium with dihydrogen phosphate have been explored. As a result of proton transfer from phosphoric acid to the pyridine nitrogen and the stabilizing effect of the two primary amines at the positions ortho to the pyridine nitrogen, the band gap between the HOMO and the LUMO is considerably diminished in comparison with that in 2,6-diaminopyridine. This is confirmed by a red shift in its absorption spectrum. Because protonation is retained in aqueous solution, the dissolved 2,6-diaminopyridinium dihydrogen phosphate salt retains a similar fluorescent spectrum as in the solid state. The crystals have been studied by single-crystal X-ray diffraction; FTIR, Raman, UV-vis-NIR, and luminescence spectroscopy; HOMO-LUMO calculations using DFT; and thermal analysis. The compound provides an example of a supramolecular motif that controls the crystal structure and the luminescence properties. In addition, the crystal exhibits negligible thermal expansion over a temperature interval of 150 °C. In short, 2,6-diaminopyridinium dihydrogen phosphate is an interesting compound for the design of luminescent devices.

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Section: Results and Discussionsupporting

confidence: 93%

Section: Results and Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

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Fluorescence Properties Reinforced by Proton Transfer in the Salt 2,6-Diaminopyridinium Dihydrogen Phosphate

et al. 2014

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“…The torsional oscillation of NH 3 + is revealed by the peak at 542 cm −1 . The strong carbonyl absorption at 1742 cm −1 characterizes -amino acid hydrobromides [12]. FTIR spectral analysis thus identifies the presence of functional group in the grown material BGHB.…”

Section: Ftir Spectrum Analysismentioning

confidence: 97%

Synthesis, Growth, and Characterization of Bisglycine Hydrobromide Single Crystal

Pandurangan¹,

Sagadevan²

2014

Journal of Materials

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Single crystals of BGHB were grown by slow evaporation technique. The unit cell dimensions and space group of the grown crystals were confirmed by single crystal X-ray diffraction. The modes of vibration of the molecules and the presence of functional groups were identified using FTIR technique. The microhardness study shows that the Vickers hardness number of the crystal increases with the increase in applied load. The optical properties of the crystals were determined using UV-Visible spectroscopy. The thermal properties of the grown crystal were also determined. The refractive index was determined as 1.396 using Brewster’s angle method. The emission of green light on passing the Nd: YAG laser light confirmed the second harmonic generation property of the crystals and the SHG efficiency of the crystals was found to be higher than that of KDP. The dielectric constant and dielectric loss measurements were carried out for different temperatures and frequencies. The ac conductivity study of the crystals was also discussed. The photoconductivity studies confirm that the grown crystal has negative photoconductivity nature. The etching studies were carried out to study the formation of etch pits.

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“…The substitution of amino acids lthreonine, dl-threonine, l-methionine, and L-cystine results in the decrease of dielectric constant value compared to pure TGS crystal [10,13]. Zinc chloride-and urea-doped samples exhibit nonlinear optical property and have SHG efficiency very much greater than standard KDP crystal [19,20]. In case of LGLM, La-, Ce-, Nd-, L-lysine-doped TGS crystal strong internal bias field is created, indicating that the dopant reduces the depolarizing effects in TGS crystals.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Spectral Studies of Pure and Doped TGSP Crystals

N.Kartheeswari

Viswanathan

2013

Journal of Spectroscopy

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Triglycine sulfate crystals (TGS) are an important class of ferroelectric materials. TGS have attracted many researches because of thier room temperature ferroelectric nature. TGS found wide applications in electronic and optical fields. In present work, pure and ADP-, KDP- (0.2 mol) doped TGSP crystals are grown from solution growth method. Grown crystals are subjected to UV-Vis, IR, and Raman spectral studies. Crystal structure of grown crystals is obtained from powder XRD pattern. Ferroelectric nature of grown crystals is tested using homemade Sawyer-Tower circuit. Electrical conductivity measurements are carried out for pure and doped TGSP crystals.

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Effect of doping an organic molecule ligand on TGS single crystals

Cited by 18 publications

References 29 publications

Fluorescence Properties Reinforced by Proton Transfer in the Salt 2,6-Diaminopyridinium Dihydrogen Phosphate

Fluorescence Properties Reinforced by Proton Transfer in the Salt 2,6-Diaminopyridinium Dihydrogen Phosphate

Synthesis, Growth, and Characterization of Bisglycine Hydrobromide Single Crystal

Vibrational Spectral Studies of Pure and Doped TGSP Crystals

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