@article{2928283, title = "A microporous Mg2+ MOF with cation exchange properties in a single-crystal-to-single-crystal fashion", author = "Eleutheria Papazoi and Antigoni Douvali and Sofia Rapti and Euaggelia Skliri and Gerasimos S. Armatas and Giannis S. Papaefstathiou and Xin Wang and Zhen-Feng Huang and Spyridon Kaziannis and Constantine Kosmidis and Antonios G. Hatzidimitriou and Theodore Lazarides and Manolis J. Manos", journal = "Inorganic Chemistry Frontiers", year = "2017", volume = "4", number = "3", pages = "530--536", publisher = "Royal Society of Chemistry (RSC)", issn = "2052-1553", doi = "10.1039/c6qi00548a", abstract = "We report herein a new alkaline earth metal ion organic framework [Mg-2(NH2BDC)(2)(HNO3)]center dot 9H(2)O (AEMOF-7), which shows a 3-D microporous structure with several unusual features, such as the rare trigonal prismatic coordination geometry of one of the crystallographically unique Mg-2(+) centers and the existence of a bridging HNO3 ligand. The H+ ions of the HNO3 ligand are dissociable as demonstrated via proton conductivity measurements. AEMOF-7 displays relatively high selectivity for CO2 vs. CH4 and negligible N-2 uptake. Interestingly, this compound was found to be capable of single-crystal-to-single-crystal (SCSC) exchange of Mg2+ by Cu2+ ions, which was observed for the first time in a MOF material. AEMOF-7 is also luminescent and its photophysical properties were investigated via solid state UV-Vis, steady-state and time-resolved luminescence studies." }