The synthesis and crystal structure of alkenyl-substituted cyclopentadienyl ruthenium complexes

Two alkenyl-substituted cyclopentadienyl ruthenium complexes(1 , 2) were sy nthesized. The diallylcyclopentadiene was obtained by a one-pot reaction of sodium cyclopentndienide and allyl chloride. The complex(2) with this liga nd is chiral and characterized by X-ray analysis. It belongs to the triclin ic space group P (1) over bar ( # 2) with a = 1.1257(6)nm, b = 1.8525(7)nm, c = 1.0134(4)nm, alpha = 90. 89 (3)degrees, beta=102.77(4)degrees, gamma=1 06.93(3)degrees. V=1.964(1)nm(3), Z= 2, D-calc =1.363g. cm(-3), F(000) = 83 2.00. The X-ray structure of complex(2) reveals that geometry around the ru thenium can be considered as distorted tetrahedral. The distance of Ru-C, R u-P and Ru-Cl is greatly different from that in CpRu (PPh3)(2)Cl. It can be concluded that the introduction of diallyl group into the cyclopentadienyl ligand results in the redistribution of electron around the ruthenium. The donation from diallyl group to cyclopentadienyl ligand weakens the;back-do nation from ruthenium to cyclopentadienyl ligand. Hence, the electron is tr ansferred to PPh3, Cl ligands.