Silylcobalt tetracarbonyls were reacted with various amines (B) in non-polar solvents to form silylammonium tetracarbonylcobaltate contact ion pairs formulated as [BSiR3+, −Co(CO)4]. The compounds were characterized by IR and multinuclear magnetic resonance spectroscopy both in solution and in solid state. Their properties are analogous to the known ion pairs [BH+, −Co(CO)4] and to amine adducts of halosilanes as well.
 W. Edgell and S. Chanjamrsi: “Studies of solution character by molecular-spectroscopy. 8. Ion sites in solutions of NaCo(CO)4 in several solvents doped with cryptand-C221”, J. Am. Chem. Soc., Vol. 102, (1980), pp. 147–155 and refs. therein. http://dx.doi.org/10.1021/ja00521a026
 P.S. Braterman and A.E. Leslie: “Strong interaction between [Co(CO)4]− and Li+ or Na+ in diethyl ether; The system LiBr2/Co2(CO)8/diethyl ether”, J. Organomet. Chem., Vol. 214, (1982), pp. C45–C49.
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