title: Single crystal X-ray diffraction, spectroscopic and mass spectrometric studies of furanocoumarin peucedanin.
abstract: The structure of peucedanin, isolated from Peucedanum tauricum Bieb. (Apiaceae), has been established using single crystal X-ray diffraction. This furanocoumarin isolated from the light petroleum extract of P. tauricum fruits was characterized by high resolution EI-MS, sATR-FTIR and 2D NMR spectroscopic techniques. The EI-MS showed the typical fragmentation pattern of methoxyfuranocoumarins. Extensive 1D (1H and 13C) as well as 2D NMR data enabled complete assignment of the carbon atoms in the peucedanin molecule. The FTIR data confirms intermolecular hydrogen bonding between peucedanin molecules in polar solvents. Peucedanin crystallises in the R-3 space group from the trigonal system with one molecule in the asymmetric part of the unit cell. The crystal lattice of peucedanin consists of the molecules arranged in separate columns. They are related by two fold screw axes and centres of symmetry. Interestingly, peucedanin columns form two channels per unit cell with a diameter of 7.5angstrom going through the crystal lattice in the Z-direction. These channels are filled with disordered water molecules, which are surrounded by hydrophobic methyl groups and are located exactly at the centres of the channels. The peucedanin molecules are stacked in a single column with the opposite orientation of the neighbouring molecules. These results could be interesting in further application of this molecule, for example in biological tests of its activity.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Bartnik
authors.forename: Marta
authors.initials: M
authors.lastname: Arczewska
authors.forename: Anna A
authors.initials: AA
authors.lastname: Hoser
authors.forename: Tomasz
authors.initials: T
authors.lastname: Mroczek
authors.forename: Daniel M
authors.initials: DM
authors.lastname: Kamiński
authors.forename: Kazimierz
authors.initials: K
authors.lastname: Głowniak
authors.forename: Mariusz
authors.initials: M
authors.lastname: Gagoś
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Woźniak
mesh_terms: D019661:Apiaceae / Q000737:chemistry*; D011564:Furocoumarins / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D021241:Spectrometry, Mass, Electrospray Ionization; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D011564:Furocoumarins; C587828:peucedanin