@article {Shivannaeaaq1636,
	author = {Shivanna, Mohana and Yang, Qing-Yuan and Bajpai, Alankriti and Sen, Susan and Hosono, Nobuhiko and Kusaka, Shinpei and Pham, Tony and Forrest, Katherine A. and Space, Brian and Kitagawa, Susumu and Zaworotko, Michael J.},
	title = {Readily accessible shape-memory effect in a porous interpenetrated coordination network},
	volume = {4},
	number = {4},
	year = {2018},
	doi = {10.1126/sciadv.aaq1636},
	publisher = {American Association for the Advancement of Science},
	abstract = {Shape-memory effects are quite well-studied in general, but there is only one reported example in the context of porous materials. We report the second example of a porous coordination network that exhibits a sorbate-induced shape-memory effect and the first in which multiple sorbates, N2, CO2 and CO promote this effect. The material, a new threefold interpenetrated pcu network, [Zn2(4,4'-biphenyldicarboxylate)2(1,4-bis(4-pyridyl)benzene)]n (X-pcu-3-Zn-3i), exhibits three distinct phases: the as-synthesized a phase; a denser-activated ß phase; and a shape-memory ? phase, which is intermediate in density between the a and ß phases. The ? phase is kinetically stable over multiple adsorption/desorption cycles and only reverts to the ß phase when heated at \>400 K under vacuum. The a phase can be regenerated by soaking the ? phase in N,N'-dimethylformamide. Single-crystal x-ray crystallography studies of all three phases provide insight into the shape-memory phenomenon by revealing the nature of interactions between interpenetrated networks. The ß and ? phases were further investigated by in situ coincidence powder x-ray diffraction, and their sorption isotherms were replicated by density functional theory calculations. Analysis of the structural information concerning the three phases of X-pcu-3-Zn-3i enabled us to understand structure-function relationships and propose crystal engineering principles for the design of more examples of shape-memory porous materials.},
	URL = {http://advances.sciencemag.org/content/4/4/eaaq1636},
	eprint = {http://advances.sciencemag.org/content/4/4/eaaq1636.full.pdf},
	journal = {Science Advances}
}