research papers
Ultrahigh-resolution crystal structures of metal complexes of self-complementary Z-DNA with the sequence d(CG)3 revealed different coordination patterns for Mn2+ (octahedral) and Zn2+ (octahedral and tetrahedral) cations. The complete sperminium cation is visible in electron density in the Mn2+ structure, while in the Zn2+ structure it is partly disordered in unison with fragments of the DNA molecule.