Crystal structures of two isomers of 1,10-bis(salicyclideneamino)-4,7-dithiadecanecobalt(III) iodide

Abstract

Crystal structure determinations have been carried out on recrystallized samples of the ‘brown’ and ‘green’ forms of the title compound [CO(O·C₆H₄·CH:N·[CH₂]₃·S·[CH₂]₂·S·[CH₂]₃·N:CH·C₆H₄·O)]⁺I^–. (I) and (II) respectively, by X-ray diffraction, using diffractometer data, and refined by least squares to R 0.043 (I) and 0.042 (II) for 581 and 3 427 reflections. Crystals of (I) are monoclinic, space group C2, a= 13.155(6), b= 11.915(4), c= 7.685(3)Å, β= 106.69(4)°, Z= 2. Crystals of (II) are triclinic, space group P, a= 20.010(8), b= 13.321(4), c= 10.086(4)Å, α= 68.74(3), β= 93.41(3), γ= 92.90(3)°, Z= 4. (II) contains a methanol solvent molecule in the lattice and comprises two types of cation, one in which the S,O,N from the same half of the ligand are coplanar, and a second, identical with that found in (I), in which the two ligand oxygen atoms are mutually trans. An absolute configuration is suggested for (I). Both cation types contain two-fold rotation axes, that in (I) being Imposed crystallographically.