Reactions of the Re(CO)3(H2O)3+ synthon with monodentate ligands under aqueous conditions

Brenton R. Franklin, Richard S. Herrick, Christopher J. Ziegler, Anil Çetin, Natalie Barone, Laura R. Condon

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The reactions of ammonia, pyridine (py), N-methyl imidazole (N-Melm), tetrahydrothiophene (tht), and piperidine (pip) with Re(CO)3(H 2O)3+, 1+, were investigated employing aqueous conditions under atmospheric dioxygen. The reaction of [1]Br in aqueous ammonia led to [Re(CO)3(NH3)3]Br ([2]Br) as the only product isolated. For the aqueous reactions of [1]Br with py, N-Melm, and tht, mixtures of products are formed because of competition between the bromide and added ligand, even when the ligand is present in excess. Substitution of the PF6- anion for Br- leads to the clean formation of [Re(CO)3L3][PF6] ([3][PF6]-[5][PF6]) for py, N-Melm, and tht, respectively, as the only products observed. Reaction of [1][PF6] with pip produces the dimeric species, (pip)(CO)3Re(μ-OH) 2Re(CO)3(pip), 6. Reactions of [1]Br were also performed in methanol for comparison purposes. The reaction with pip in this solvent led to the analogous dimer, (pip)(CO)3Re(μ-OMe)2Re(CO) 3(pip), 7; however, reactions with py, N-Melm, and tht gave Re(CO)3L2Br, 8-10, respectively, as the only products. The crystal structures of compounds [2]Br-10 are reported.

Original languageEnglish
Pages (from-to)5902-5909
Number of pages8
JournalInorganic Chemistry
Issue number13
StatePublished - 7 Jul 2008
Externally publishedYes


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