Lithium and Lead(II) Butyrates Binary System. Pure Compounds and an Intermediate Salt: From 2D to 3D Coordination Polymers

详细信息    查看全文

• 作者：F. J. Marti虂nez Casado ; M. Ramos Riesco ; I. da Silva ; M. I. Redondo Ye虂lamos ; A. Labrador ; J. A. Rodri虂guez Cheda
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：March 2, 2011
• 年：2011
• 卷：11
• 期：3
• 页码：759-767
• 全文大小：1041K
• 年卷期：v.11,no.3(March 2, 2011)
• ISSN：1528-7505

文摘

The binary phase diagram between lithium and lead(II) butyrates, [xLiC₃H₇CO₂ + (1 鈭?x)Pb(C₃H₇CO₂)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 T_fus = 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.