Structural studies of complex compounds of 6,6 -diacetyl-2,2 -bipyridine dioxime with copper(I/II), platinum(II), and palladium(II) metal ions

Authors : Abdurrahman ŞENGÜL, Hakan AĞAÇ, Burak ÇOBAN and Erol EROĞLU

Pages : 25-36

Doi:10.3906/vet-1203-9

View : 16 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The tetradentate ligand 6,6`-diacetyl-2,2`-bipyridine dioxime insert ignore into journalissuearticles values(L); was obtained in high yield by the condensation reaction of 6,6`-diacetyl-2,2`-bipyridine with hydroxyl amine in alkaline solution. Density functional calculations and 3D modeling of the structure at the B3LYP/6-31Ginsert ignore into journalissuearticles values(d); level of theory for L revealed that the energy difference between the global trans conformer insert ignore into journalissuearticles values(trans-L);, which possesses the C2h point group, and the distorted cis conformer insert ignore into journalissuearticles values(cis-L); was 5.214 kcal/mol. Synthesis and characterization of the metal complexes with Cuinsert ignore into journalissuearticles values(I);, Cuinsert ignore into journalissuearticles values(II);, Ptinsert ignore into journalissuearticles values(II);, and Pdinsert ignore into journalissuearticles values(II); metal ions were reported. L acted as a N4-donor ligand to coordinate to the metal centers via N atoms of the 2,2`-bipyridine and the imine moieties to afford tetrahedral complex [CuIL]PF6 insert ignore into journalissuearticles values(1);, distorted octahedral complex [CuIILinsert ignore into journalissuearticles values(OH2);2]insert ignore into journalissuearticles values(NO3);2 insert ignore into journalissuearticles values(2);, and square-planar complexes [PtIIL]Cl2 insert ignore into journalissuearticles values(3); and [PdIIL]Cl insert ignore into journalissuearticles values(4);, respectively. The CHN analysis for 1 implies that L coordinated to 2 copperinsert ignore into journalissuearticles values(I); ions as a bridging ligand to form a dinuclear metal complex, [Cu2L2]2+, due to the twisting of the coordinated bonds exposed by the tetrahedral geometry preference for the metal ion. The ligand formed intramolecular hydrogen bonds between the oxime groups in 4, as revealed by the spectroscopic studies. The most stable conformations of the compounds were obtained by using the molecular mechanics optimization feature in CAChe software with an augmented MM2 force field.1
Keywords : Oxime, N donor ligands, bipyridine, copper, platinum, palladium