Rhenium(i) compounds bound by tripodal ligands of pyridine and N-methylimidazole??

Dalton Transactions Pub Date: 2008-06-02 DOI: 10.1039/B802170H

Abstract

The reaction of Re(CO)5Br with tris(2-pyridyl)methanol (tpmOH) leads to unexpectedly complex chemistry with three new compounds forming instead of a single product. In compound 1, the tpmOH ligand binds to the metal in the N,N′,N″-mode; 2 has tpmO? bound in the N,N′,O-mode; while 3 is a dimer with the tpmO? ligand utilizing each of the four donor atoms to bridge the two metal centers. The analogous methyl ether ligands, tris(2-pyridyl)methoxymethane (tpmOMe) or tris[2-(l-methylimidazolyl)]methoxymethane (timmOMe), each yielded a single product, 4 and 5, respectively, bound in the N,N′,N″-mode, and are new leads for potential radiotherapeutic agents. All compounds have been structurally characterized.

Graphical abstract: Rhenium(i) compounds bound by tripodal ligands of pyridine and N-methylimidazole
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