Chiral Recognition Among Trisdiimine - Metal Complexes: 1. Structures of Tris-(3,3'-bi-1,2,4-triazine)iron(II) Complexes

Article abstract of DOI:10.1007/BF00818160

By cyclo-condensation of β-diketones with oxamiddihydrazone 3,3'-bi-triazines with different substituents in 5,5'-, 6,6'-position and their corresponding iron(II)-trischelates were synthesized.The structures of the complexes tris-(3,3'-bi-1,2,4-triazine, 5,5'6,6'-tetramethyl)iron(II) ditetrachloroferrate(III) and tris-(3,3'-bi-1,2,4-triazine, 5,5'6,6'-tetraphenyl)iron(II) ditetrachloroferrate(III) could be solved by means of single crystal X-ray-analysis.Both complexes crystallize from racemic solutions in an enantiomorphic space group (P2₁3 and P2₁2₁2₁ respectively) with one molecule in the asymmetric unit, i.e. the rare phenomenon of spontaneous resolution by crystallization is observed.Hence, homochiral intermolecular interactions are strongly preferred over heterochiral ones. - Keywords.Chiral recognition; Chiral discrimination; Spontaneous resolution; Trisdiimine complexes; 3,3'-Bi-triazines; Crystal structures.