21303-03-7Relevant articles and documents
Lithium and lead(II) butyrates binary system. pure compounds and an intermediate salt: From 2D to 3D coordination polymers
Casado, F. J. Martinez,Riesco, M. Ramos,Silva, I. Da,Yelamos, M. I. Redondo,Labrador,Cheda, J. A. Rodriguez
, p. 759 - 767 (2011)
The binary phase diagram between lithium and lead(II) butyrates, [xLiC 3H7CO2 + (1 - x)Pb(C3H 7CO2)2] was determined by differential scanning calorimetry, in order to investigate the formation of intermediate salts. A complex or intermediate salt (with a 1:1 stoichiometry) was found during the solution of the phase diagram. Crystals of this salt, which melt incongruently at Tfus = 443.2 K, were obtained later by crystallization. The structures of the crystal phase of both pure compounds and the intermediate salt were solved by single crystal and powder X-ray diffraction, using synchrotron radiation. Lithium and lead(II) butyrates present a monoclinic unit cell (P21/c and P21/m, respectively). Both pure salts show a bilayered arrangement, in a structure of 2D coordination polymers, as usually metal alkanoates do. Nevertheless, the complex forms a microporous 3D ionic network (tetragonal, I41/a), very atypical in this kind of organic salts. Binary phase diagrams are proved to be a powerful tool to detect and predict the formation of intermediate crystals.
