Zero Thermal Expansion in a Flexible, Stable Framework: Tetramethylammonium Copper(I) Zinc(II) Cyanide
Zero Thermal Expansion in a Flexible, Stable Framework: Tetramethylammonium Copper(I) Zinc(II) Cyanide
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DOI：
10.1021/ja906895j
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发表时间：
2010-01-13
影响因子：
15
通讯作者：
Kepert, Cameron J.
中科院分区：
文献类型：
--
作者：
Phillips, Anthony E.;Halder, Gregory J.;Kepert, Cameron J.
通过变温粉末和单晶 X 射线衍射研究了四甲基铵氰化铜 (I) 锌 (II)，它由捕获在类方石英金属氰化物骨架中的 N(CH3)(4)(+) 离子组成。其热膨胀系数在 200-400 K 温度范围内近似为零，可与最好的商用零热膨胀材料相媲美。原子位移参数、表观键长和低温、低对称性相的结构表明，导致这种行为的低能振动模式保持近似刚性的锌配位四面体，但涉及其铜对应物的显着变形。
Tetramethylammonium copper(I) zinc(II) cyanide, which consists of N(CH3)(4)(+) ions trapped within a cristobalite-like metal cyanide framework, has been studied by variable-temperature powder and single-crystal X-ray diffraction. Its coefficient of thermal expansion is approximately zero over the temperature range 200-400 K and comparable with the best commercial zero thermal expansion materials. The atomic displacement parameters, apparent bond lengths, and structure of a low-temperature, low-symmetry phase reveal that the low-energy vibrational modes responsible for this behavior maintain approximately rigid Zn coordination tetrahedra but involve significant distortion of their Cu counterparts.