Journal ArticleDOI
The crystal structure of l-alanine
H. J. Simpson,R.E. Marsh +1 more
TLDR
The crystal structure of L-alanine, C3H702N, has been determined and refined by analysis of complete three-dimensional diffraction data from copper X-radiation.Abstract:
The crystal structure of L-alanine, C3H702N, has been determined and refined by analysis of complete three-dimensional diffraction data from copper X-radiation. The crystals are orthorhombic with space group P212~21 ; the unit-cell dimensions are a = 6.032, b = 12.343, c = 5.784 A. Least-squares refinement of the positional parameters of all 13 atoms and of the individual anisotropic temperature factors of the six heavy atoms, using 581 observed reflections of non-zero weight, yielded a final R index of 0.049. The structure bears a striking resemblance to that Of DL-alanine, and involves the use of all available protons in N-H • • • O hydrogen bonds, with lengths of 2.83, 2.85, and 2.81 A,.read more
Citations
More filters
Journal ArticleDOI
Dosimetry by ESR spectroscopy of alanine
D.F. Regulla,U. Deffner +1 more
TL;DR: Typical dosimeter samples, consisting of small pellets of microcrystalline amino acids in paraffin, are rugged, non-toxic, and insensitive to surface contaminations, and have proven to be highly useful in various applications of radiation processing and sterilization dosimetry, food irradiation, quality control, radiation dosimetric, radiation therapy measurements, and as a reference system for Dosimetry mailing intercomparisons.
Book ChapterDOI
Crystal structure studies of amino acids and peptides.
Richard E. Marsh,Jerry Donohue +1 more
TL;DR: This chapter illustrates that in earlier times only two amino acids and DL-alanine, one Dipeptide, and one cyclic dipeptide has been investigated, and these by X-ray diffraction techniques that were crude by present-day standards.
Journal ArticleDOI
Study of hydrogen bonds in amino acids and peptides.
C. Ramakrishnan,Nageshwar Prasad +1 more
TL;DR: An analysis of the various parameters associated with N-H… O type of hydrogen bonds has been made using data from reported crystal structures of amino acids and simple peptides, indicating that the group NH has a very strong tendency to point towards the acceptor oxygen atom.
Journal ArticleDOI
The gas-phase structure of alanine.
TL;DR: The jet-cooled rotational spectrum of neutral alanine has been studied using laser-ablation molecular-beam Fourier transform microwave spectroscopy (LA-MB-FTMW), and the independent structures of both conformers have been determined experimentally for the first time.
Journal ArticleDOI
Optical properties of L-alanine Organic Crystals
Lino Misoguti,A. T. Varela,F.D. Nunes,Vanderlei Salvador Bagnato,Francisco Melo,J. Mendes Filho,Sérgio Carlos Zílio +6 more
TL;DR: In this article, the optical properties of L-alanine crystals grown from aqueous solution using the well-known slow evaporation method were reported, including absorption spectra and refractive indices, as well as nonlinear properties of second harmonic generation, such as phase-matching loci and efficiency.