cis,cis,cis-1,5,9-Cyclododecatriene−Metal Complexes

The ligand properties of cis,cis,cis-1,5,9-cyclododecatriene (c,c,c-cdt) have been explored. For the known (c,c,c-cdt)Ni (1b) and (c,c,c-cdt)(AgNO3)3 (5) complexes and the new [(c,c,c-cdt)Cu(MeOH)]BF4 (6b), [(c,c,c-cdt)Cu][Al{OC(CF3)3}4] (6d), and (tBu2PC2H4PtBu2)Ni(η2-c,c,c-cdt) (7b) complexes, the molecular structures have been determined. The c,c,c-cdt ligand in 5 and 7b retains the C2 symmetrical helical conformation of the free c,c,c-cdt, whereas in 1b and 6b,d, it assumes a C3 symmetrical ratchet conformation. The coordination geometry of the metal in 6b is tetrahedral, and it is trigonal pyramidal in 1b and 6d. Details of the synthesis and chemical and spectroscopic properties of the complexes are reported.