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The polymeric compound [{W(NO)2Cl2}n] were prepared by reductive nitrosylation of NaNO2 and acidified FeSO4 with WCl6 at room temperature. The reactions of [{W(NO)2Cl2}n] with unidentate and bidentate ligands afforded neutral monomeric [{W(NO)2Cl2L2(or L-L)] in a relative high yields (70∼90%). 3,5-lutidine, γ-cyanopyridine, 1,2-phenylenediamine, 1,10-phenanthroline, sym-diphenylethylenediamine, 9,10-phenanthrenequinone, 1,3-bis(diphenylphosphino)propane, 1,1'-bis(diphenylphosphino)ferrocene and 8-hydroxyquinoline were used as coordinating ligands. These dinitrosyltungsten complexes were characterized by elemental analysis, 1H-NMR, infrared, and UV-visible spectroscopy are reported. The spectral data indicated that geometric structures of the products were cis-dinitrosyl-trans-dichloro-cis-L2 of C2v symmetry.
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