Figure 1
From: New chromium(III)-based catalysts for ethylene oligomerization

The structures of complex compounds acting as catalysts in ethylene oligomerization: (1) [Cr(dipic)2][Cr(bipy)(dipic)(H2O)] ∙ 2 H2O, (2) [Cr(dipic)2]Hdmbipy ∙ 2.5 H2O, (3) cis-K[Cr(C2O4)(OH2)2], (4) Cr(dipic)(H2O)3]Cl ∙ 2 H2O and (5) (5-aminopyridine-2-carboxylate)3 chromium(III).