The crystal packing of bis(2,2′-dipyridylamido)cobalt(ii), Co(dpa)2, is stabilized by C–H···N bonds: are there any real precedents?

Abstract
A crystallographic study of Co(dpa) 2 reveals that the pseudo-tetrahedral molecules stack together to form a one-dimensional ribbon with the molecules linked together through significant C–H···N interactions; the C···N separation is 3.41(3) Å and the angle at the hydrogen atom is 177(2)°.

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