The compd. [Re(CO)3(PPh3)2Cl] reacted with Li(OCHNR) (R = Ph, p-CH3C6H4, p-ClCl6H4, p-CH3OC6H4, p- NO2C6H4, o-CH3C6H4) in boiling THF or toluene to yield [Re(CO)2(RNCHO)(PPh3)2] (I). The IR spectra suggest that the ligand is chelated and that the 2 CO groups are in cis positions. The crystal structure of I (R = p-NO2C6H4) was detd. by x-ray anal. using counter data. The compd. crystallizes in the triclinic system, space group P1, with a 10.26(1), b 12.91(1), c 16.73(1) Å, 111.27(3)°, 75.78(3)°, and 107.12(3)° for Z = 2. The structure was refined to R = 0.049. The Re atom is in a distorted octahedral coordination with 2 axial PPh3, 2 cis-CO groups, and the bidentate ligand forming a 4-membered ring with the metal.
Synthesis and characterization of new formamido-complexes of rhenium(I). The crystal structure of [Re(CO)2(p-NO2C6H4NCHO)(PPh3)2]
TONIOLO, Luigi
1983-01-01
Abstract
The compd. [Re(CO)3(PPh3)2Cl] reacted with Li(OCHNR) (R = Ph, p-CH3C6H4, p-ClCl6H4, p-CH3OC6H4, p- NO2C6H4, o-CH3C6H4) in boiling THF or toluene to yield [Re(CO)2(RNCHO)(PPh3)2] (I). The IR spectra suggest that the ligand is chelated and that the 2 CO groups are in cis positions. The crystal structure of I (R = p-NO2C6H4) was detd. by x-ray anal. using counter data. The compd. crystallizes in the triclinic system, space group P1, with a 10.26(1), b 12.91(1), c 16.73(1) Å, 111.27(3)°, 75.78(3)°, and 107.12(3)° for Z = 2. The structure was refined to R = 0.049. The Re atom is in a distorted octahedral coordination with 2 axial PPh3, 2 cis-CO groups, and the bidentate ligand forming a 4-membered ring with the metal.
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