Structural Chemistry of Thorium Iodates

Abstract

AbstractThe hydrothermal reaction of Th(NO3)4·xH2O with I2O5 in the presence of KCl results in the crystallization of α-Th(IO3)4(H2O) and β-Th(IO3)4(H2O). The structure of αTh(IO3)4(H2O) is three-dimensional and contains Th4+ cations bound by iodate anions and a coordinating water, creating a tricapped trigonal prismatic environment around the thorium centers. βTh(IO3)4(H2O) is layered, and contains ThO9 units that are best described as capped square antiprisms. Crystallographic data: (193 K, MoKα, λ = 0.71073 Å): α-Th(IO3)4(H2O), monoclinic, space group P21/c, a = 7.2335(3) Å, b = 24.6046(12) Å, c = 7.0150(3) Å, b = 112.1888(8)°, V = 1156.05(9), Z = 4, R(F) = 1.97%; βTh(IO3)4(H2O), monoclinic, space group C2/c, a = 33.928(1) Å, b = 5.7466(2) Å, c = 12.4509(5) Å, b = 107.9896(7)°, V = 2308.8(1), Z = 8, R(F) = 1.63%.