Giant Negative Area Compressibility Tunable in a Soft Porous Framework Material
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- 作者：Weizhao Cai ; Andrzej G艂adysiak ; Michalina Anio艂a ; Vincent J. Smith ; Leonard J. Barbour ; Andrzej Katrusiak
- 刊名：Journal of the American Chemical Society
- 出版年：2015
- 出版时间：July 29, 2015
- 年：2015
- 卷：137
- 期：29
- 页码：9296-9301
- 全文大小：430K
- ISSN：1520-5126
文摘
A soft porous material [Zn(L)2(OH)2]n路Guest (where L is 4-(1H-naphtho[2,3-d]imidazol-1-yl)benzoate, and Guest is water or methanol) exhibits the strongest ever observed negative area compressibility (NAC), an extremely rare property, as at hydrostatic pressure most materials shrink in all directions and few expand in one direction. This is the first NAC reported in metal鈥搊rganic frameworks (MOFs), and its magnitude, clearly visible and by far the highest of all known materials, can be reversibly tuned by exchanging guests adsorbed from hydrostatic fluids. This counterintuitive strong NAC of [Zn(L)2(OH)2]n路Guest arises from the interplay of flexible [鈭抁n鈥揙(H)鈭抅n helices with layers of [鈭抁n鈥揕鈭抅4 quadrangular puckered rings comprising large channel voids. The compression of helices and flattening of puckered rings combine to give a giant piezo-mechanical response, applicable in ultrasensitive sensors and actuators. The extrinsic NAC response to different hydrostatic fluids is due to varied host鈥揼uest interactions affecting the mechanical strain within the range permitted by exceptionally high flexibility of the framework.