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J. Chem. Soc., Chem. Commun., 1981, 612 - 613, DOI: 10.1039/C39810000612
Second-sphere co-ordination of neutral and cationic transition metal complexes by crown ethers
Howard M. Colquhoun and J. Fraser Stoddart
The[ammine(
5-cyclopentadienyl) dicarbonyl-iron(II)] cation and the neutral complex amminepentacarbonyltungsten(0), form 1:1 adducts in solution with 18-crown-6 and dibenzo-18-crown-6 by virtue of hydrogen bonding between the ammine ligand in the transition metal complex and oxygen atoms of the crown ether; a crystalline adduct, [W(CO)5NH3 dibenzo-18-crown-6], has been isolated as a benzene solvate.
