TERNARY LITHIUM RARE EARTH NITRATES WITH LONESOME NITRATE IONS - LI-3[M(NO3)(5)](NO3) (M=GD-LU, Y) - THE CRYSTAL STRUCTURE OF LI3ER(NO3)(6) [German]

摘要

Single crystals of the ternary nitrate Li3Er(NO3)(6) are obtained from a solution of ''Er(NO3)(3)'' in the melt of LiNO3. In Li3Er(NO3)(6) (monoclinic, P2(1), Z = 4; a = 776.0(1); b = 748.86(8); c = 2396(1) pm; beta = 90.76(3)degrees R1 = 0.0490; wR2 = 0.0792), Er3+ is surrounded by five bidentate nitrate Ligands yielding the anionic units [Er(NO3)(5)](2-). These are arranged in the direction of the 2(1) screw axis. Two lonesome NO3- ions are in the middle of such a ''helix'' and are connected by Li+ with the anions [Er(NO3)(5)](2-). The helices are moved against each other by about half of the lattice constant a and are connected by further Li+ ions. [References: 13]