Gligor Jovanovski

Fourier Transform Vibrational Spectra of Magnesium Hydrogenphosphate Trihydrate. I. The O-H Stretching Region∗

Abstract The Fourier transform (FT) infrared and Raman spectra of newberyite, MgHPH4 - 3H2O are studied in the region where the stretching vibrations of the water molecules (protiated and deuterated) and the O-H/O-D stretches of the hydrogenphosphate anions are expected to appear. The O-H stretching vibrations give rise to a complex feature known as the A,B,C trio. Since neither of the maxima found below 3000 cm−1 represents a true band arising from a given fundamental, it is pointless to correlate their frequencies with the observed O…O distances. In the water stretching region, the two bands with highest frequencies undoubtedly correspond to the anti symmetric and symmetric stretch of one type of the water molecules. The stretching vibrations of one of the remaining two types of H2O molecules are clearly uncoupled and the O-H oscillator involved in the weaker hydrogen bond is responsible for a band at 3376 cm−1 whereas the rest of the water stretchings are apparently overlapped yielding the complex band...

FT Infrared Spectra of Binuclear Copper(II) Imidazole Saccharinato Complex: Correlation with the Structure

Abstract The FT infrared spectra of the binuclear copper(II) complex with imidazole and saccharin and of its iminodeuterated analogue at room (RT) and liquid nitrogen temperature (LNT) are recorded. The bands that are mainly due to the NH, ND, CO, SO2 and metal-ligand stretchings are assigned. The spectral characteristics are correlated with the available structural data and compared with the corresponding data for other saccharinates and imidazole complexes.

MINERALS FROM MACEDONIA. X-RAY POWDER DIFFRACTION vs. VIBRATIONAL SPECTROSCOPY IN MINERAL IDENTIFICATION

A b s t r a c t: Some of the advantages and imperfections in the cases when the X-ray powder diffraction (XRPD), Fourier transform infrared (FTIR) or Raman vibrational spectroscopy are used as a separated techniques in the process of the mineral detection, identification, discrimination and characterization are comparatively presented. The studied mineral samples: rutile, TiO2; hematite, Fe2O3; almandine, Fe3Al2(SiO4)3; spessartine, Mn3Al2(SiO4)3; limonite, FeO(OH); goethite, α-FeO(OH); ferrojohannsenite, Ca(Fe,Mn)Si2O6; olivine, (Mg,Fe)2SiO4; forsterite, Mg2SiO4; fayalite, Fe2SiO4; beryl, Be3Al2Si6O18; phlogopite, KMg3(Si3Al)O10(F,OH)2 and clinochlore (sheridanite), (MgFe)5Al(Si3Al)O10(OH)8 are collected from various localities in the Republic of Macedonia.