Arene ruthenium compounds Cp*rhodium complexes 1,2-Bis(di-2-pyridylaminomethyl)benzene ligand a b s t r a c t A general approach for the preparation of dinuclear h 5 -and h 6
Keywords
Arene ligands Pyridine aldehydes Schiff bases Ruthenium Rhodium and iridium a b s t r a c tA series of mono-cationic dinuclear half sandwich ruthenium, rhodium and iridium metal complexes have been synthesized using ((pyridin-2-yl)methylimino)nicotinamide (L1) and ((picolinamido)phenyl) picolinamide (L2) ligands: , 9; Ir, 10). All the complexes have been isolated as their hexafluorophosphate salts and fully characterized by use of a combination of NMR and IR spectroscopy. The solid state structure of three representatives 4, 6 and 9 has been determined by Xray crystallographic studies. Interestingly, in the molecular structure of 4, the first metal is bonded to two nitrogen atoms whereas the second metal center is coordinated to only one nitrogen atom with two terminal chloride ligands. Fascinatingly in the case of the complexes with the symmetrical ligand L2, both ruthenium centers having h 6 -arene groups are bonded to nitrogen atoms with a bridging chloride atom between the two metal centers, whereas the metals with h 5 -Cp* groups are bonded to the ligand N,O and N,N fashion.
Reaction of two equivalents 4-{(3-(pyridine-2-yl) 1H-pyrazole-1-yl}methyl benzonitrile (L1) and 3-{(3-(pyridine-2-yl)1H-pyrazole-1-yl}methyl benzonitrile (L2) with one equivalent of [(η 6-arene)Ru(μ-Cl)Cl] 2 and [Cp*M(μ-Cl)Cl] 2 in methanol yielded mononuclear complexes of the formulae [(η 6arene)Ru(L1/L2)Cl]BF 4 {arene =C 6 H 6 (1, 6); C 10 H 14 (2, 7); C 6 Me 6 (3, 8)} and [Cp*M(L1/L2)Cl]PF 6 /BF 4 {Cp*= η 5-C 5 Me 5 , M=Rh (4, 8); Ir (5, 10)}. These complexes are characterized by IR, 1 H NMR and identities of the structure are established by single crystal XRD studies of some of the representative complexes. It is confirmed from the spectral studies that the nitrile group is not taking part in complexation; instead it remains as a free pendant group only.
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