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1 H NMR binding titrations indicate the interlocked dicationic receptor is capable of chloride recognition even in competitive 30% aqueous mixtures. © 2020 WILEY-VCH Verlag GmbH Co. KGaA, Weinheim.The alkaline earth metals (M=Mg, Ca, Sr, and Ba) exhibit a +2 oxidation state in nearly all known stable compounds, but M(I) dimeric complexes with M-M bonding, [M 2 (en) 2 ] 2+ , (en = ethylenediamine) of all these metals can be stabilized within the galleries of donor-type graphite intercalation compounds (GICs). These metals can al