Physical and Physicochemical Aids in Characterization and in Determination of Structure

5'-phosphate 9-methyl absorption Acta Crystallogr adenine adenosine Amer amino group ammonium angle anomeric proton anomers aqueous assigned bands base bond carbon cation Chem chemical shift chromatography column compounds conformation crystal curve Cytidine cytosine D. J. Brown deuterium doublet effect elution exocyclic guanine Guanosine heterocyclic HOCH2 hydroxyl hypoxanthine imidazole infrared intensity ionization J. J. Fox mass spectra method methyl group methyl sulfoxide-d6 Methylamino mixture molecule neutral species NH2 NH2 nitrogen atom nucleic acid nucleic acid components nucleo nucleosides Nucleosides and Nucleotides observed obtained p.m.r. spectroscopy p.m.r. spectrum Patterson map peak phate phosphate pKa values positive Cotton-effect proton protons on C-2 purine purine nucleosides pyridine pyrimidine pyrimidine nucleosides R. K. Robins resonance RF values ring sample separation singlet solution solvent Spectra of Purines structure substituents Table technique Thiol thymine tion trimethylsilyl ultraviolet Ultraviolet Spectra uracil uridine wavelength Wavenumber