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revised on 09.09.2019 and posted on 09.09.2019by Nathan J. Oldenhuis, Peter Qin, Shu Wang, Hong-Zhou Ye, Eric Alt, Adam Willard, Troy Van Voorhis, Stephen Craig, Jeremiah Johnson
We present a polymer network that can reversibly switch between three distinct states of mechanical and chemical properties, significantly extending the boundaries of state-switching materials. This switching behavior is enabled by a photoreduction mechanism that leverages coumarin-functionalized cuboctahedral Cu24L24 metal-organic cages (MOCs) linked by polymers in a "polyMOC" gel. The properties of each material state can be used in a cooperative fashion to achieve advanced functions such as network toughening, metallic patterning, and additive manufacturing