Infrared and Raman spectroscopic studies of L‐methioninium nitrate
TL;DR: The vibrational spectra of (C5H12NO2S+·NO3−) crystals were studied and the observed IR and Raman lines were assigned.
Abstract: The vibrational spectra of (C5H12NO2S+·NO3−) crystals were studied and the observed IR and Raman lines were assigned The two protonated methioninium cations exist in two different conformations Although the crystal structure is stabilized by a three-dimensional network of intermolecular hydrogen bonds, the latter are also responsible for the changes in the position and intensity of some bands Strong OH··· O bonds involving the carboxyl group and normal NH··· O bonds involving the amino group were found from the vibrational spectra Copyright © 2004 John Wiley & Sons, Ltd
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TL;DR: In this article, the chirality of the carbon dots can affect the optical properties of photosensitizer molecules like azobenzene, which can react differently with D and L-carbon dots when irradiated with UV light.
Abstract: In this work, we have successfully prepared chiral carbon dots from chiral precursors. We prepared a few D-carbon dots using D-methionine, D-glucose, D-glucosamine, and L-carbon dots from L-methionine, L-aspartic acid and L-alanine. We also demonstrate that the chirality of the carbon dots can affect the optical properties of photosensitizer molecules like azobenzene. In the presence of azobenzene, D-carbon dots and L-carbon dots interacted differently when irradiated with UV light, as azobenzene in the presence of UV transforms from stable trans to metastable cis form. Thus azobenzene can react differently with D- and L-carbon dots when irradiated with UV light.
47 citations
TL;DR: Theophyllinium nitrate (TN) as mentioned in this paper is a semi-organic compound, which is derived from Theophyllium oxide (NO3)-naphase.
36 citations
TL;DR: Two results, one being the CV molecule proved that nickel nanonetwork is indeed SERS active and the second being the GSH biomolecule detection at both 532 and 785 nm, confirm that the nanonet work is a biosensor which has potential for both in vivo and in vitro sensing.
Abstract: We introduce a “non-noble metal” based SERS active nanobiosensor using a self-assembled 3D hybrid nickel nanonetwork. A tunable biomolecule detector fabricated by a bottom-up approach was functionalized using a multiphoton ionization energy mechanism to create a self-assembled 3D hybrid nickel nanonetwork. The nanonetwork was tested for SERS detection of crystal violet (CV) and glutathione (GSH) at two excitation wavelengths, 532 and 785 nm. The results reveal indiscernible peaks with a limit of detection (LOD) of 1 picomolar (pM) concentration. An enhancement factor (EF) of 9.3 × 108 was achieved for the chemical molecule CV and 1.8 × 109 for the biomolecule GSH, which are the highest reported values so far. The two results, one being the CV molecule proved that nickel nanonetwork is indeed SERS active and the second being the GSH biomolecule detection at both 532 and 785 nm, confirm that the nanonetwork is a biosensor which has potential for both in vivo and in vitro sensing. In addition, the selectivit...
30 citations
TL;DR: A comparative study of infrared and Raman spectra of DL-valineDL-valinium picrate (DL-VVP) and DL-methionine DL-MMP at the room temperature in 4000-50 cm(-1) range helps to determine the effect of hydrogen bonds in these crystals.
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References
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Book•
01 Jan 1978TL;DR: In this article, the normal modes of vibration are illustrated and corresponding vibrational frequencies are listed for each type, including diatomic, triatomic, fouratomic, five-atomic, six-atomic and seven-atomic types.
Abstract: Inorganic molecules (ions) and ligands are classified into diatomic, triatomic, four-atomic, five-atomic, six-atomic, and seven-atomic types, and their normal modes of vibration are illustrated and the corresponding vibrational frequencies are listed for each type. Molecules of other types are grouped into compounds of boron, carbon, silicon, nitrogen, phosphorus, and sulfur, and the structures and infrared (IR)/Raman spectra of select examples are shown for each group. Group frequency charts including band assignments are shown for phosphorus and sulfur compounds. Other group frequency charts include hydrogen stretching frequencies, halogen stretching frequencies, oxygen stretching and bending frequencies, inorganic ions, and metal complexes containing simple coordinating ligands.
Keywords:
inorganic compounds;
coordination compounds;
diatomic molecules (ligands);
triatomic molecules (ligands);
four-atomic molecules (ligands);
five-atomic molecules (ligands);
six-atomic molecules (ligands);
seven-atomic molecules (ligands);
boron compounds;
carbon compounds;
silicon compounds;
nitrogen compounds;
phosphorus compounds;
sulfur compounds;
group frequency charts
15,951 citations
Book•
01 Jan 1963
TL;DR: In this paper, a sequence of procedures for identifying an unknown organic liquid using mass, NMR, IR, and UV spectroscopy is presented, along with specific examples of unknowns and their spectra.
Abstract: Presents a sequence of procedures for identifying an unknown organic liquid using mass, NMR, IR, and UV spectroscopy, along with specific examples of unknowns and their spectra,
11,753 citations
Book•
01 Jan 1962
TL;DR: In this article, the authors present a survey of research work in physics, physical sciences, and physical chemistry, focusing on physics, chemistry, physics, and biology. But they do not discuss their work in this paper.
Abstract: This book should be of interest to senior undergraduates, postgraduates and research workers in physics, physical sciences, physical chemistry.
8,754 citations