Synthesis and Crystal Structure of LaHSe2O6, a Layered, Anhydrous Selenite.

摘要

Lanthanum hydrogen selenite, LaHSe2O6, M, = 393.83, orthorhombic, Pc21b (No. 29), a = 7.139 (6) A, b = 19.008 (9) A, c = 8.469 (9) A, (alph = 90 deg, Beta = 90 deg, gamma = 90 deg, V = 1149.24 A3, Z = 8, Dx = 4.55 g CM- 3, u = 199.7 cm-1, lambda (Mo Ka, graphite monochromator) = 0.71073 A, F(000) = 1392, room temperature 298 (2) K. Final R = 3.61%, wR = 4.21% for 1701 observed reflections with I > 3 sigma(I)). LaHSe2O6 has been prepared using hydrothermal synthetic techniques and its crystal structure elucidated by single crystal X-ray diffraction. This new structure consists of layers of LaOl0, HSeO3 and SeO3 polyhedra parallel to the ac-place; the layers are interconnected by Se-OH ... O-(Se,La) hydrogen bonds.