Spectroscopic investigation of nitric acid monohydrate

Microwave investigation of sulfuric acid monohydrate.

The complex H2SO4-H2O has been observed by rotational spectroscopy in a supersonic jet. A-type spectra for 18 isotopic forms have been analyzed, and the vibrationally averaged structure of the system has been determined. The complex forms a distorted, six-membered ring with the water unit acting as both a hydrogen bond donor and a hydrogen bond acceptor toward the sulfuric acid. One of the H2SO...

Mucin/poly(acrylic acid) interactions: a spectroscopic investigation of mucoadhesion.

Studies using infrared, (1)H and (13)C nuclear magnetic resonance, and X-ray photoelectron spectroscopies and differential scanning calorimetry support the hypothesis that hydrogen bonds, formed between the carboxylic acid functionality of the mucoadhesive material poly(acrylic acid) and the glycoprotein component of mucus, play a significant role in the process of mucoadhesion. There are fewer...

Mass Spectroscopic Investigation of Nucleic Acid Degradation Products

The possibilities of structure elucidation of nucleic acid degradation products and of sequencing of oligonucleotides are discussed. There are three classes of natural products, the sequencing of which has been attempted by mass spectrometry, viz. oligosaccharides, peptides and nucleotides. While oligosaccharides offer some special problems due to structural variability, peptides and nucleotide...

Spectroscopic Investigation of Proteins

Perfluorobutyric acid and its monohydrate: a chirped pulse and cavity based fourier transform microwave spectroscopic study.

Rotational spectra of perfluorobutyric acid (PFBA) and its monohydrate were studied with a broadband chirped pulse and a narrow-band cavity based Fourier transform microwave spectrometer, and high-level ab initio calculations. Extensive conformational searches were performed for both the acid and its monohydrate at the MP2/6-311++G(2d,p) level of theory. Two and three conformers were predicted ...