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| - Hydrogen Storage Properties of Metal Nitroprussides M[Fe(CN)5NO], (M = Co, Ni)
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| - The volumetric hydrogen adsorption isotherms of two isostructural dehydrated cubic metal nitroprussidesM[Fe(CN)5NO] (M = Co2+, Ni2+) have been measured up to a pressure of 760 Torr at 77 and 87 K. Thesematerials are among the most efficient H2 sorbents based on porous coordination polymers reported to date.The H2 uptake in both materials is ∼1.6 wt % at 77 K and 760 torr. These H2 capacities match those reportedrecently in the structurally related M3[Co(CN)6]2 compounds and are approximately 25% higher than thosereported for Zn4O(1,4-benzenedicarboxylate)3 under the same conditions of temperature and pressure. Theisosteric heats of H2 adsorption calculated from the 77 and 87 K isotherms for both materials were found tovary from ∼7.5 kJ/mol at 0.40 wt % coverage to ∼5.5 kJ/mol at 1.2 wt % coverage. The N2 BET surfaceareas were determined to be 634 m2/g and 523 m2/g for M = Ni and M = Co, respectively.
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