220937-39-3Relevant academic research and scientific papers
Rhenium(I) terpyridine π-bases: Reversible η2-coordination of ketones, aldehydes, and olefins in the terpyridine plane
Helberg, Lisa E.,Brent Gunnoe,Brooks, Benjamin C.,Sabat, Michal,Harman, W. Dean
, p. 573 - 581 (1999)
The complex trans-[Re(terpy)(Br)(PPh3)2][OTf] (2) (terpy = 2,2′:6′,2″-terpyridine) is a convenient precursor to the electron-rich π-basic fragment {(terpy)(L)2Re}+ (L = tBuNC or PMe3). Reduction of 2 with activated magnesium in the presence of unsaturated organic molecules and an excess of either tBuNC or PMe3 yields complexes of the type trans-[(terpy)-(L)2Re(η2-π)][OTf] (L = tBuNC or PMe3; π = olefin, aldehyde, or ketone). The dihapto-coordinated organic moieties show a preference for binding in the plane of the terpy ligand. Reaction of trans-[Re(terpy)(tBuNC)2(η2-acetone)][OTf] (9) with MeOTf yields an observable η2-ketonium complex. The electronic environment of these complexes has been probed by cyclic voltammetry, and the details of ligand exchange for the η2-ketone complexes are presented. Geometric features determined from X-ray crystal structure analyses of trans-[(terpy)(tBuNC)2Re(η 2-cyclopentene)][OTf] (4) and trans-[(terpy)(tBuNC)2Re(η 2-acetophenone)]-[OTf] (11) are reported.
