- Reactions of Planar Pentadentate Ligands with Palladium and Platinum Chlorides. Crystal Structures of cis-Dichlorobis(N'-isopropylidenebenzohidrazide)platinum(II) and the Cyclopalladated Dianion of N',N' -(Pyridine-2,6-diethylidene)bis(benzohydrazide)
-
The products from the reactions of the planar pentadentate ligand N',N' -(pyridine-2,6-diyldiethylidyne)bis(benzohydrazide) L1, with PdCl42- and PtCl2 have been investigated.In both cases extensive changes in the ligand L1 occur so that square-planar complexes can be formed.With PdCl42-, two cyclopalladation reactions take place involving the insertion of the Pd atom into a C-H and an N-H bond.The presence of an anionic nitrogen in a cyclopalladation product is unusual.The reaction of PtCl2 in acetone with L1 led to the displacement of the 2,6-diacetylpyridine group by acetone with the formation of the new ligand N'-isopropylidenebzohydrazide, L2, in the complex cis-2)2>.Surprisingly, an analysis of the Pt-Cl and Pt-N distances in 23 cis- and 18 trans- (L=nitrogen donor ligand) complexes revealed no significant differences in the dimensions of the two geometries.The average Pt-Cl distances were 2.293(15) Angstroem in the cis and 2.293(9) Angstroem in the trans isomers.
- Palenik, Gus J.,Giordano, Thomas J.
-
p. 1175 - 1180
(2007/10/02)
-