4963-30-8Relevant academic research and scientific papers
1,4-Bis(4-nitrosophenyl)piperazine: Novel bridging ligand in dinuclear complexes of rhodium(iii) and iridium(iii)
Wirth, Stefan,Barth, Florian,Lorenz, Ingo-Peter
, p. 2176 - 2186 (2012)
The synthesis, spectroscopic characterization and crystal structures of the first 1,4-bis(4-nitrosophenyl)piperazine (BNPP) (4) bridged dinuclear complexes of rhodium(iii) and iridium(iii) are presented. The reaction of the μ2-halogenido-bridged dimers [(η5-C 5Me5)IrX2]2 [X = Cl (5a), Br (5b), I (5c)] and [(η5- C5Me5)RhCl 2]2 (6a) with 4 yields the dinuclear complexes [(η5-C5Me5)IrX2] 2-BNPP (7a-c) and [(η5-C5Me 5)RhCl2]2-BNPP (8a). All new compounds were characterized by their NMR, IR and mass spectra. The X-ray structure analyses of the obtained half-sandwich complexes revealed a slightly distorted pseudo-octahedral configuration ("three-legged pianostool") for the metal(iii) centers. The bridging BNPP ligand is σ-N coordinated by both nitroso groups and shows different conformations of the piperazine ring depending on the solvent used for crystallization. Moreover the crystal structures of 1,4-bis(4-nitrosophenyl)piperazine (4) and its precursor 1,4-diphenylpiperazine (3) are reported.
