Structural and luminescence study of europium and terbium nitrate hexahydrates

Add time:08/03/2019    Source:sciencedirect.com

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) Å; α=91.14(4), β=110.79(5), γ=70.14(5)°; V=617.9(6) Å3, Dcalc=2.44 g cm−1, Dmeas=2.41 g cm−1. The final RF 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 Å 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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