Synthesis, and Crystal and Molecular Structure of Heptaaquabis (1-hydroxy-2-naphthoato)lanthanum(III) 1-Hydroxy-2-naphthoate Hydrate and the Isomorphous Neodymium(III) Salt, [M{C 10 H 6 (OH)CO 2 } 2 (H 2 O) 7 ][C 10 H 6 (OH)CO 2 ]·H 2 O (M=La, Nd)