| 1. A hydrogen storage tank comprising a container accommodating a hydrogen adsorbent therein, wherein said hydrogen adsorbent
adsorbs hydrogen gas and accommodates said hydrogen gas in a space other than a space occupied by said hydrogen adsorbent
in said container, wherein
said hydrogen adsorbent is any one of [M2(4,4′-bipyridine)3(NO3)4] provided that M represents any one of Co, Ni, and Zn; [M2(1,4-benzenedicarboxylate anion)2] provided that M represents any one of Cu and Zn; and [Fe2(trans-4,4′-azopyridine)4(NCS)4]; and
said hydrogen adsorbent is capable of adsorbing said hydrogen gas of a volume exceeding an occupation volume of said hydrogen
adsorbent and which has an amount of endothermic heat of not more than 16 kJ per mol of hydrogen molecules when said adsorbed
hydrogen gas is released.
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