摘要:
The complexes [Fel2(CNR)4] (R = Ph, p-MeC6H4 or Bu(t)) react with Hg in the presence of CNR to give [(RNC)5Fe --> Hgl2], and exchange reactions with AgX (X = Br or Cl) lead to the corresponding halogeno-complexes [(RNC)5Fe --> HgX2]. Treatment with 1 mol of AgClO4 affords the cationic complexes [(RNC)5Fe-HgX]ClO4 which are unstable towards mercury extrusion. The relative stability of the complexes is discussed in terms of the influence of the lignads co-ordinated to Hg and the steric and electronic characteristics of the RNC ligands. The structure of [(p-MeC6H4NC)5Fe --> Hgl2] has been determined: monoclinic, space group P2(1)/a, a = 16.680(3), b = 18.031 (4), c = 15.256(2) angstrom, beta = 116.92(2)-degrees and Z = 4.