title: Polarized vibrational studies of bisguanidinium hydrogenphosphate monohydrate.
abstract: Detailed vibrational studies (FTIR and Raman on powder samples, polarized FTIR microscope on a small single crystal, polarized FTIR using Bruker reflection unit on a single crystal and polarized Raman) have been carried out. Vibrational spectra are discussed in relation to the crystal structure published previously. In this crystal a network of hydrogen bonds link water molecules, guanidinium cations and hydrogenphosphate ions. The 13 different hydrogen bonds in G2HP crystal structure are detected. On the basis of detailed vibrational studies the detailed assignment of observed bands was made. Calorimetric (DSC) studies have been performed, but no phase transition was found in the temperature range 100-350 K.
authors.affiliation: Institute of Low Temperature and Structure Research of the Polish Academy of Sciences, Okólna 2 str., 50-422 Wrocław, Poland. drozd@int.pan.wroc.pl
authors.forename: M
authors.initials: M
authors.lastname: Drozd
authors.forename: J
authors.initials: J
authors.lastname: Baran
mesh_terms: D002412:Cations / Q000737:chemistry; D003461:Crystallography; D006146:Guanidines / Q000737:chemistry*; D006860:Hydrogen Bonding; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013830:Thiadiazoles / Q000737:chemistry*; D013871:Thiones / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: C512061:5-amino-3H-1,3,4-thiadiazole-2-thione; D002412:Cations; D006146:Guanidines; D013830:Thiadiazoles; D013871:Thiones; D014867:Water