Guest-Dependent Negative Thermal Expansion in Nanoporous Prussian Blue Analogues MIIPtIV(CN)6·x{H2O} (0 
详细信息 查看全文
详细信息 查看全文
- 作者：Andrew L. Goodwin ; Karena W. Chapman ; and Cameron J. Kepert
- 刊名：Journal of the American Chemical Society
- 出版年：2005
- 出版时间：December 28, 2005
- 年：2005
- 卷：127
- 期：51
- 页码：17980 - 17981
- 全文大小：108K
- 年卷期：v.127,no.51(December 28, 2005)
- ISSN：1520-5126
文摘
The guest-dependent thermal expansion behavior of the nanoporous Prussian Blue analogues MIIPtIV(CN)6·x{H2O} (0 
x 2; M = Zn, Cd) has been investigated using variable temperature single-crystal X-ray diffraction. The dehydrated phases MIIPtIV(CN)6 were found to exhibit negative thermal expansion, attributed to thermal population of low energy transverse vibrations of the bridging cyanide ligands. The presence of guest molecules within the framework pore system was found capable of dampening the effect of these transverse vibrational modes. The guest-loaded ZnII phase, in which the available pore volume is commensurate with the volume occupied by individual water molecules, possesses a considerably higher coefficient of thermal expansion, with the material switching from positive to negative thermal expansion behavior upon guest removal.
x 2; M = Zn, Cd) has been investigated using variable temperature single-crystal X-ray diffraction. The dehydrated phases MIIPtIV(CN)6 were found to exhibit negative thermal expansion, attributed to thermal population of low energy transverse vibrations of the bridging cyanide ligands. The presence of guest molecules within the framework pore system was found capable of dampening the effect of these transverse vibrational modes. The guest-loaded ZnII phase, in which the available pore volume is commensurate with the volume occupied by individual water molecules, possesses a considerably higher coefficient of thermal expansion, with the material switching from positive to negative thermal expansion behavior upon guest removal.