Optical Properties and Structure of Ln(NCS)(Hmpa)4-(SCN)2- HgCl(SCN)

E. Gałdecka Institute for Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław, Poland Z. Gałdecki Institute of General and Ecological Chemistry, Technical University of Łódź, Żwirki 36, 90-924 Łódź, Poland V. Amirkhanov Department of Chemistry, Kiev State University, Vladimirskaya 64, 252033 Kiev, Ukraine K. Kern and J. Legendziewicz Faculty of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland

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Praseodymium, neodymium and europium complexes of the formula Ln(NCS)(Hmpa)4-(SCN)2-HgCl(SCN) were synthesised from non-aqueous solutions. The structure of neodymium complexes was determined by X-ray diffraction. The crystals of the title compounds crystallise in the space group Cc, where lanthanide ions are coordinated to seven ligand groups: four of Hmpa molecules and three SCN¯ ions. The compounds were characterised by IR, luminescence, excitation and absorption spectra at 6, 77, and 298 K. Probabilities of electronic transitions for Pr3+ ion were examined at 6 K and at room temperatures. Vibronic components were observed and analysed on the basis of IR and Raman data. Asymmetric arrangement of Ln ions was found from X-ray analysis and its influence on optical properties of active centre was discussed.

DOI: 10.12693/APhysPolA.90.469 PACS numbers: 78.20.Wc, 78.55.Hx, 78.20.Dj, 78.66.-w, 61.66.Fn