Aqua[2,6-diacetylpyridinedi(benzoic acid hydrazone)]nitratocobalt(II) Nitrate at 173K

The structure of aqua(nitrato-O){pyridine-2,6-diylbis[N-(1-ethylideneamino)benzamide]-O¹,N²,N¹,N⁵,O²}cobalt(II) nitrate, [Co(NO₃)(C₂₃H₂₁N₅O₂)(H₂O)]NO₃, was redetermined at 173 K. There are only small differences between the bond distances in the cation at 173 K relative to the room-temperature determination reported previously. The average difference is 0.006 Å for all 45 bond distances and only 0.004 Å for 27 bonds if the two phenyl rings and two nitrate ions, which have large thermal motions, are excluded. The Co^II atom is in the center of a pentagonal bipyramid consisting of the pentadentate ligand, with a water molecule and monodentate nitrate ligand in the axial positions.

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