Institute of Applied Problems of Physics, NAS of Armenia, 25 Nersessyan Str., 0014 Yerevan, Armenia.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Mar;104:486-91. doi: 10.1016/j.saa.2012.11.050. Epub 2012 Nov 29.
A crystal structure redetermination of the L-tryptophan picrate crystal previously studied by Ishida et al. (Chem. Pharm. Bull. 41 (1993) 433-438) showed that it comprises L-tryptophan L-tryptophanium dimeric cation, one picrate anion and picric acid. The O⋯O distance of the O-H⋯O hydrogen bond in the dimeric cation is equal to 2.470(6) Å. The infrared spectrum of the crystal was registered and analyzed. The infrared spectrum of the crystals contains a broad absorption band centered at ca. 1170 cm(-1), which is assigned to the stretching vibration of the O-H bond.
伊师达等人先前研究的 L-色氨酸苦味酸盐晶体的一个晶体结构重新测定表明，它由 L-色氨酸 L-色氨酸翁二聚阳离子、一个苦味酸阴离子和苦味酸组成。二聚阳离子中 O-H⋯O 氢键的 O⋯O 距离等于 2.470(6) Å。记录并分析了晶体的红外光谱。晶体的红外光谱包含一个大约在 1170 cm(-1) 处的宽吸收带，它被分配给 O-H 键的伸缩振动。
