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Molecular helicity in inorganic complexes; bi- and tri-nuclear complexes of 2,2′:6′,2″:6″,2″′:6″′,2″″:6″″,2″″′-sexipyridine and the crystal and molecular structure of bis(µ-2,2′:6′,2″:6″,2″′:6″′,2″″:6″″,2″″′-sexipyridine-κ 3 N,N′,N″:κ 3 N″′,N″″,N″″′) dicadmium hexafluorophosphate–acetonitrile (1/4)

1991; Royal Society of Chemistry; Issue: 7 Linguagem: Inglês

10.1039/dt9910001675

2050-5671

Edwin C. Constable, Michael D. Ward, Derek A. Tocher,

DNA and Nucleic Acid Chemistry

The potentially sexidentate ligand 2,2′:6′,2″:6″,2‴:6‴,2â�—:6â�—,2â�—′-sexipyridine (L) has been prepared and shown to demonstrate considerable structural versatility in forming double helical binuclear complex cations of the type [M2L2]4+(M = MnII, FeII, CuII or CdII) or [M3L2]3+(M = CuI and AgI). A binuclear palladium(II) complex with a metal : ligand stoichiometry of 2 : 1 has also been characterised. The electrochemical properties of these complexes are reported, together with redoxinitiated interconversions of [Cu3L2]n+ and [Cu2L2]n+ species. The crystal and molecular structure of the double helical complex [Cd2L2][PF6]4·4MeCN [space group C2/c, a= 20.466(8), b= 18.872(6), c= 20.617(5)Å, β= 111.98(2)°, R= 0.0599, R′= 0.0634] is reported; the two metal centres are separated by 4.173(4)Å and coplanar pyridyl rings of the two independent ligands within the cation show short π-stacking interactions.