Abstract
The chloride donor in Re(σ 2 -terpy)(CO) 3 Cl (1) may be substituted for acetonitrile to give [Re(σ 2 -terpy)(CO) 3 (CH 3 CN)][PF 6 ] (2), but in the cationic complex [Re(σ 2 -terpyMe)(CO) 3 Cl][PF 6 ] (4) substitution of the chloride could not be achieved. However, use of [Re(σ 2 -terpyMe)(CO) 3 I][PF 6 ] (3) results in the formation of [Re(σ 2 -terpyMe)(CO) 3 (CH 3 CN)][PF 6 ] 2 (5).

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