IR-LD spectroscopic characterization of L-Tryptophan containing dipeptides.
IR-spectroscopic and stereo-structural analysis of aromatic l-Tryptophan containing dipeptides l-Tryptophan-l-Tryptophan (Trp-Trp), l-Tyrosine-l-Tryptophan (Tyr-Trp) and cyclo(Trp-Trp) have been carried out by means of solid-state linear-dichroic infrared (IR-LD) spectroscopy of oriented as suspension in nematic liquid crystal solids. The experimental data have been compared with analogous ones of the simple amino acids l-Tyrosnine (l-Tyr) and l-Tryptophan (l-Trp). In cyclo(Trp-Trp), the IR-spectral changes towards the IR-ones of acyclic Trp-Trp have been determined. A theoretical analysis of Tyr-Trp at Hartree-Fock level of theory and 6-31G** basis set is also applied.
Sofia University "St. Kl. Ohridski", Faculty of Chemistry, 1164 Sofia, Bulgaria. ahbi@chem.uni-sofia.bg
Bojidarka B
BB
Ivanova
D000596:Amino Acids / Q000737:chemistry*; D004151:Dipeptides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular; D049329:Nanostructures / Q000737:chemistry; D010455:Peptides / Q000737:chemistry*; D013055:Spectrophotometry, Infrared / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D014364:Tryptophan / Q000737:chemistry*; D014961:X-Ray Diffraction
D000596:Amino Acids; D004151:Dipeptides; D010455:Peptides; D014364:Tryptophan