39069-02-8

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• Structure

  C12H6Br2N2, orthorhombic, Pna21 (no. 33), a = 19.6816(9) Å, b = 4.6554(2) Å, c = 11.8795(6) Å, V = 1088.47(9) Å3, Z = 4, Rgt(F) = 0.043, wRref(F2) = 0.107, T = 293 K. A stable one-dimensional (1D) layered structure is formed by π⋅⋅⋅π stacking interactions between 2,9-dibromo-1,10-phenanthroline molecules that pack along the crystallographic b-axis. The quantum chemical calculation shows the interaction energy between 2,9-dibromo-1,10-phenanthroline molecules is −9.22 kcal/mol. The 1D layered structures are linked to form a two-dimensional (2D) sheet via C2—H2⋅⋅⋅Br2 hydrogen bonds with d(H2⋅⋅⋅Br2) = 3.028 Å and <(C2—H2⋅⋅⋅Br2) = 158.55°. The 2D sheets pack dispersive interactions to construct the three-dimensional (3D) crystal structure. Compared to the π⋅⋅⋅π stacking interaction, the aforementioned C2—H2⋅⋅⋅Br2 hydrogen bond is much weaker. At the ωB97X-D/def2-TZVPP theory level, the interaction energy of the C2—H2⋅⋅⋅Br2 hydrogen bond is −2.48 kcal/mol.;

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