摘要
尾-Alaninium picrate crystallizes in the form of yellow columns, in the triclinic system (space group P, Z = 2). The asymmetric unit contains one 尾-alaninium cation and one picrate anion. Nevertheless, the unit cell comprises a dimeric centrosymmetric 尾-Ala+鈰?em>尾-Ala+ cation and two picrate anions. The O鈰疧 distance (2.636(2) 脜) in the dimeric cation is among the shortest distances of known salts with A+鈰疉+ type dimeric cations. The infrared and Raman spectra are shown and discussed. A comparison of known crystals with 尾-Ala+鈰?em>尾-Ala+ cations is presented, which shows that four different types can be distinguished.