Some azido, cyano, thiocyanato, and related complexes of bis-π-cyclopentadienyl-molybdenum and tungsten

Abstract

The complexes (π-C₅H₅)₂MCl₂(M = Mo or W) undergo displacement reactions with pseudohalides forming a variety of complexes, e.g., (π-C₅H₅)₂MX₂, where M = Mo, W and X = N₃, NCS. Related complexes with mixed ligands are similarly prepared, e.g., (π-C₅H₅)₂WXY, where X and Y are Cl and NCS, NCS and SCN, MeO and CN, or EtO and CN. The cyanate anion reacts forming the complexes (π-C₅H₅)₂Mo(OCONH₂)₂, (π-C₅H₅)₂W(OCONH₂),H₂O, and (π-C₅H₅)₂W(NCO)₂. Some of the complexes oxidise forming stable cations, e.g., [(π-C₅H₅)₂WCINCS]⁺PF₆. The cyano-complexes protonate forming hydrogen cyanide complexes, e.g., [(π-C₅H₅)₂-WOEtCNH]⁺PF₆^–.