Hydrothermal Synthesis of Rare Earth Iodates from the Corresponding Periodates: Structures of Sc(IO3)3, Y(IO3)3 · 2 H2O, La(IO3)3 · 1/2 H2O and Lu(IO3)3 · 2 H2O

Hydrothermal syntheses of single crystals of rare earth iodates, by decomposition of the corresponding periodate, are presented. This appears to be a generic method for making rare earth iodate crystals in a short period of time. Single crystal X-ray diffraction structures of the four title compounds are presented. Sc(IO3)3: Space group R3, Z = 6, lattice dimensions at 100 K; a = b = 9.738(1), c = 13.938(1) Å; R1 = 0.0383. Y(IO3)3 · 2 H2O: Space group P1, Z = 2, lattice dimensions at 100 K: a = 7.3529(2), b = 10.5112(4), c = 7.0282(2) Å, α = 105.177(1)°, β = 109.814(1)°, γ = 95.179(1)°; R1 = 0.0421. La(IO3)3 · ? H2O: Space group Pn, Z = 2, lattice dimensions at 100 K: a = 7.219(2), b = 11.139(4), c = 10.708(3) Å, β = 91.86(1)°; R1 = 0.0733. Lu(IO3)3 · 2 H2O: Space group P1, Z = 2, lattice dimensions at 120 K: a = 7.2652(9), b = 7.4458(2), c = 9.3030(3) Å, α = 79.504(1)°, β = 84.755(1)°, γ = 71.676(2)°; R1 = 0.0349. Hydrothermal-Synthese von Seltenerdelement-Iodaten aus den entsprechenden Periodaten: Strukturen von Sc(IO3)3, Y(IO3)3 · 2 H2O, La(IO3)3 · 1/2 H2O und Lu(IO3)3 · 2 H2O Es werden die Hydrothermal-Synthesen von Einkristallen der Seltenerdelement-Iodate durch Zersetzung der entsprechenden Periodate beschrieben. Dies scheint eine allgemein anwendbare Methode zur Herstellung von Seltenerdiodat-Einkristallen in kurzer Zeit zu sein. Einkristall-Röntgenstruktur-Analysen der vier Titelverbindungen werden mitgeteilt. Sc(IO3)3: Raumgruppe R3, Z = 6, Gitterkonstanten bei 100 K; a = b = 9,738(1); c = 13,938(1) Å; R1 = 0,0383. Y(IO3)3 · 2 H2O: Raumgruppe P1, Z = 2, Gitterkonstanten bei 100 K: a = 7,3529(2); b = 10,5112(4); c = 7,0282(2) Å; α = 105,177(1)°; β = 109,814(1)°; γ = 95,179(1)°; R1 = 0,0421. La(IO3)3 · ? H2O: Raumgruppe Pn, Z = 2, Gitterkonstanten bei 100 K: a = 7,219(2); b = 11,139(4); c = 10,708(3) Å; β = 91,86(1)°; R1 = 0,0733. Lu(IO3)3 · 2 H2O: Raumgruppe P1, Z = 2, Gitterkonstanten bei 120 K: a = 7,2652(9); b = 7,4458(2); c = 9,3030(3) Å; α = 79,504(1)°; β = 84,755(1)°; γ = 71,676(2)°; R1 = 0,0349.