Jean-Claude Bunzli - Structural and Luminescence Study of Europium and Terbium Nitrate Hexahydrates

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  Publication Details (including relevant citation   information):

  Moret,E., Bunzli,J.C.G., Schenk,K.J. Inorganica Chimica   Acta 1990 178 (1) 83-88

  Abstract: The crystal structure of Tb(NO3)3.6H2O   is determined at 295 K from X-ray diffraction measurements. The   compound crystallizes in the triclinic space group P1 (ITC No. 2)   with Z = 2. Cell parameters are: a = 9.095(7), b = 11.600(6), c =   6.705(4) angstrom; alpha = 91.14(4), beta = 110.79(5), gamma =   70.14(5)-degrees; V = 617.9(6) angstrom-3, D(calc) = 2.44 g cm-1,   D(meas) = 2.41 g cm-1. The final R(F) was 0.036 for 2165 unique   reflections. The Tb(III) is decacoordinated, being bonded to four   water molecules and three bidentate nitrate ions. The   coordination polyhedron is a distorted 4A,6B-extended   dodecahedron. One nitrate ion is asymmetrically bonded, with one   Tb-O distance 0.22 angstrom longer than the other. The   luminescent properties of Eu(III) and Tb(III) in   [Ln(NO3)3(X2O)4].2X2O, X = H, D are reported. The number of water   molecules directly coordinated to the metal ion are estimated   from lifetime measurements. These numbers largely exceed the   expected value of 4. This fact, together with analogous results   reported for the chloride hexahydrates, tend to demonstrate that   this method should be used with care

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