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Article Abstract
Water confined to the quasi-one-dimensional hydrophilic molecular nanoporous crystal of {[Co(Hbim)](TMA)·20HO} () (Hbim = 2,2'-biimidazole, TMA = trimesate) forms dynamic water molecule clusters (WMCs) with a hierarchical three-layered hydrogen-bonding (H-bonding) structure and a time-averaged structure in the melting state due to interactions with the walls of the ∼1.6 nm nanopores. This was first revealed by measuring the solid-state H NMR spectra of a single crystal of {[Co(Dbim)](TMA)·20DO} (), which revealed distinct hierarchical peaks of HO H-bonding interactions. In addition, the frozen WMCs in exhibit a premelting state, retaining some ice structures, just before melting through a first-order phase transition during the heating process. Measurements of the spin-lattice relaxation time () in solid-state H NMR revealed rapid rotation motions for water molecules in these premelting WMCs, resulting in a correlation time τ closer to that of bulk liquid water.
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