Vibrational spectra of mono, di and trimethyl ammonium double sulphates of rare earths Pr, Nd, Ho and Eu.
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...O and O-H...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 (CH(3))(2)NH(2) and SO(4)(2-) ions indicate that the structural bonding of (CH(3))(2)NH(2)Eu(SO(4))(2).H(2)O and (CH(3))(2)NH(2)Ho(SO(4))(2).4H(2)O is identical. Electronic transition bands of Eu(3+) and Nd(3+) observed in the Raman spectra of these two compounds have been identified and discussed.
Department of Radiology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum 695011, Kerala, India. jayashreemenon@gmail.com
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Jayasree
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Nayar
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Jordanovska
D000645:Ammonium Sulfate / Q000032:analysis / Q000737:chemistry*; D005063:Europium / Q000032:analysis / Q000737:chemistry; D006695:Holmium / Q000032:analysis / Q000737:chemistry; D006860:Hydrogen Bonding; D028581:Lanthanoid Series Elements / Q000032:analysis / Q000737:chemistry*; D008744:Methylamines / Q000032:analysis / Q000737:chemistry*; D015394:Molecular Structure; D009354:Neodymium / Q000032:analysis / Q000737:chemistry; D011221:Praseodymium / Q000032:analysis / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014732:Vibration
D028581:Lanthanoid Series Elements; D008744:Methylamines; D009354:Neodymium; D005063:Europium; C027451:methylamine; D011221:Praseodymium; D000645:Ammonium Sulfate; D006695:Holmium