An orthorhombic polymorph of naphthalene-2,3-dicarbonitrile

The achiral title compound, C₁₂H₆N₂, crystallizes in the non-centrosymmetric space group P2₁2₁2₁. Its structure is compared with that of the triclinic polymorph, which crystallizes with two independent molecules in space group P1. In the crystal structure, the molecules stack along the a direction, and zigzag chains, extending in the b direction, are formed owing to the presence of C—H...N intermolecular contacts.

[1,3-Bis(2-pyridylimino)isoindolinato-κ³N,N′,N′′]chloro­(1,2-dicyano­benzene-κN)(dimethyl sulfoxide-κS)ruthenium(II)

The title compound, [Ru(C₁₈H₁₂N₅)Cl(C₈H₄N₂)(C₂H₆OS)], consists of an Ru^II atom hexagonally coordinated by a tridendate isoindoline ligand, a Cl atom, the S atom of a dimethyl sulfoxide molecule and an N atom of a CN group of dicyano­benzene. In the crystal structure, a three-dimensional network is built up owing to the presence of weak C—H...O and C—H...Cl intermolecular hydrogen bonds.