802902-55-2Relevant academic research and scientific papers
A new dichroic, nitroso-bridged complex of rhenium: Di-μ2- chloro[μ2-(η2-N,O)-N,N-dimethyl-4-nitrosoaniline] bis[tricarbonylrhenium(I)]
Wilberger, Roland,Krinninger, Christoph,Piotrowski, Holger,Mayer, Peter,Lorenz, Ingo-Peter
, p. 2488 - 2492 (2004)
The dimeric μ2-amino-phenoxy complexes of rhenium [(CO) 3Re(μ2-∩NH2)]2 (1) do not react with the C-nitroso compounds R-C6H4NO [R = NMe 2 (2), H (2′) in the presence of AlCl3 by a condensation reaction to give the desired azo dye complexes [(CO) 3Re(μ2-O∩N=NC6H4R)] 2. Instead, they react to give the novel neutral η2-N, O-bridged C-nitroso complexes [{CO)3ReCl}2ONC 6H4R] (3, 3′) by means of a substitution reaction. Both complexes yield golden gleaming crystals, and their solutions are deeply blue (3) or violet (3′) due to the broad UV/Vis absorption at λ = 617 (3) and 505 nm (3′). Single crystals of 3, 3′ show nonlinear optical properties, they are dichroic and have a red and blue (3) or violet and green (3′) side. The molecular structures of 3, 3′ have been determined by single-crystal X-ray analyses. Both compounds contain two face-joined octahedra, with two chloro and the NO ligands as bridges. The C-nitroso groups together with the NC2 moiety of NMe2 (3) lie almost exactly within the symmetry plane of the molecules. Both the N atoms of 3 have a trigonal-planar geometry, 3 and 3′ are the first single, neutral and dinuclear C-nitroso complexes with the rare non-assisted μ-(η2-N,O) bridge and only single atoms as additional bridges. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
