Encapsulation of nitrate by a self-assembled tetranickel(II) complexDedicated to Prof. Dr Gottfried Huttner on the occasion of his 65th birthday.

Abstract
Reaction of nickel(II) nitrate with the ditopic ligand 4-[6-(2-pyridyl)-2-pyridyl]-6-(2-pyridyl)pyrimidine (L) leads to a self-assembled tetranuclear [2 × 2] grid complex, which encapsulates NO3− with short van der Waals contact distances.

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