Metal-Organic Frameworks (MOFs) are highly porous materials composed of organic linkers connected by inorganic nodes. A unique subset of MOFs shows switchability, the ability to switch between at least two distinct structures differing significantly in porosity. These unique guest dependent pore opening and closing processes offer new opportunities in gas separation, selective recognition, sensing and energy storage. However, the factors affecting switchability are poorly understood. Network topology, micromechanics of building blocks and their hinges, but also particle size, defects, agglomeration, desolvation conditions etc. are convoluted into the responsiveness of the system. In essence all factors are a consequence of the materials history including synthesis procedure and desolvation but also all subsequent handling steps such as mechanical and adsorption stress leading to a complex interplay of factors which are difficult to express clearly by ordinary writing systems, chemical or mathematical symbols without loss of intuitive understanding. Here we propose a symbolic language for the rationalization of switchability emphasizing the history dependent responsivity of many dynamic frameworks and their stimuli induced 1st order phase transitions. Color representations of the guest and host offer an intuitive understanding of switchability phenomena even for non-experts. The system follows a bivalent logic inspired by Freges Begriffsschrift providing a fundamental logic structure for the rationalization of statements and representation of logic gates.

中文翻译：

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可切换多孔框架材料的逻辑和符号

金属有机骨架（MOF）是高度多孔的材料，由通过无机节点连接的有机连接基组成。MOF的唯一子集显示出可切换性，即在孔隙率显着不同的至少两个不同结构之间切换的能力。这些独特的，取决于客户的孔打开和关闭过程为气体分离，选择性识别，传感和能量存储提供了新的机会。但是，影响可切换性的因素知之甚少。网络拓扑，构件及其铰链的微力学，以及粒度，缺陷，团聚，去溶剂化条件等，都被卷积到系统的响应能力中。本质上，所有因素都是材料历史的结果，包括合成过程和去溶剂化，还包括所有后续处理步骤，例如机械应力和吸附应力，导致复杂的相互作用，这些相互作用很难用普通的书写系统，化学或数学符号清楚地表达出来。不会失去直觉的理解。在这里，我们提出了一种象征性的语言，用于合理化可切换性，强调了许多动态框架及其刺激引起的一阶相变的依赖历史的响应度。来宾和主持人的颜色表示即使对于非专家也可以直观地了解可切换性现象。