Synthesis and crystal structure of the lithium perrhenate monohydrate LiReO4 center dot H2O

A new monohydrate of lithium perrhenate LiReO4.H2O was prepared by dehydrat ion of LiReO4.1.5H(2)O at room temperature. The single crystals of LiReO4.H 2O were obtained by crystallisation from the isoamyl acetate solution of Li ReO4.1.5H(2)O. The structure of monohydrate (a = 5.6674(4), b = 10.771(1), c = 7.4738(7) Angstrom, beta = 102.422(7)degrees, R-1 = 0.0414, space group P2(1)/a, Z = 4) is built up from LiO3(H2O)(2) trigonal bipyramids and ReO4 tetrahedra sharing common edges and corners inside the layers. The layers are connected together by hydrogen bonds. The relationships between the str uctures of sesquihydrate, monohydrate and anhydrous LiReO4 are discussed. ( C) 2001 Editions scientifiques et medicales Elsevier SAS. All rights reserv ed.