Thermal Expansion Matching via Framework Flexibility in Zinc Dicyanometallates
Thermal Expansion Matching via Framework Flexibility in Zinc Dicyanometallates
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DOI：
10.1021/ja901355b
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发表时间：
2009-05-13
影响因子：
15
通讯作者：
Kepert, Cameron J.
中科院分区：
文献类型：
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作者：
Goodwin, Andrew L.;Kennedy, Brendan J.;Kepert, Cameron J.
采用变温单晶和粉末X射线衍射研究了两种同结构二氰合锌的热膨胀性能，它们在结晶时含有和不含有弱相互作用的第二结晶相。无客体的Zn[Au（CN）（2）]（2）骨架表现出很强的各向异性的正、负热膨胀。相比之下，其共晶类似物Zn[Ag（CN）（2）]（2）中心点xAgCN表现出温和得多的行为，使得主体Zn[M（CN）（2）]（2）骨架的热膨胀系数现在与结晶AgCN的热膨胀系数相匹配。有人提出，这种相关性指向高度柔性框架材料“匹配”粘附相的热膨胀性的更一般的能力（例如，基质、山梨酸盐或共晶物质），提出了消除多组分组件中热应变的方法。
The thermal expansion properties of two isostructural zinc dicyanometaltates that crystallize with and without the inclusion of a weakly interacting secondary crystalline phase have been investigated using variable temperature single-crystal and powder X-ray diffraction. The guest-free Zn[Au(CN)(2)](2) framework was found to show very strong anisotropic positive and negative thermal expansion. In contrast, its cocrystal analogue Zn[Ag(CN)(2)](2)center dot xAgCN exhibited much more moderate behavior, such that the coefficient of thermal expansion for the host Zn[M(CN)(2)](2) framework now matched that of crystalline AgCN. It was proposed that this correlation points to a more general ability of highly flexible framework materials to "match" the thermal expansivity of adhered phases (e.g., substrates, sorbates, or cocrystattized species), suggesting a methodology of eliminating thermal strain in multicomponent assemblies.