Browsing by Author "Jordanovska, V."
Now showing 1 - 1 of 1
Results Per Page
Sort Options
Item Vibrational spectra of mono, di and trimethyl ammonium double sulphates of rare earths Pr, Nd, Ho and Eu(SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 2006)Infrared and Raman spectra of four rare earth (Ho, Eu, Nd and Pr) double sulphates have been recorded and analysed based on the vibrations of methyl ammonium cations, sulphate anions and water molecules. Formation of hydrogen bonds of the type N-H center dot center dot center dot O and O-H center dot center dot center dot O are identified in all the compounds. Bifurcated hydrogen bonds are present in the compounds with dimethyl ammonium cations. The sulphate anions are distorted and occupy a lower site symmetry in the compounds. The bands obtained for (CH3)(2)NH2 and SO42- ions indicate that the structural bonding of (CH3)(2)NH2Eu(SO4)(2)center dot H2O and (CH3)(2)NH2Ho(SO4)(2)center dot 4H(2)O is identical. Electronic transition bands of Eu3+ and Nd3+ observed in the Raman spectra of these two compounds have been identified and discussed. (c) 2005 Elsevier B.V. All rights reserved.