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A ZnII complex of the dianionic tetradentate ligand formed by deprotonation of glyoxal-bis(4-phenyl-3-thiosemicarbazone) (H2gtsp) is a [3+3] trinuclear triangular prism. Recrystallization of this complex in the presence of either CO2, CS2, or CH3CN leads to the formation of [4+4] open-ended charge-neutral tetranuclear coordination nanotubes, approximately 2 nm in length and with internal dimensions large enough to accommodate linear guest molecules, which serve to template their formation. Upon removal of the templating molecules the nanotubes demonstrated reversible sorption of CO2 with an isosteric enthalpy of sorption of 28 kJ mol−1 at low loading. [ABSTRACT FROM AUTHOR]

Reversible Sorption of CO2Templating molecules in square coordination nanotubes of dianionic bridging ligands and zinc(II) centers can be replaced by CO2 molecules as described by B. M. Paterson, B. F. Abrahams, P. S. Donnelly et al. in their Communication on page 8370 ff. [ABSTRACT FROM AUTHOR]