Dirhenium Coordination Complex Endowed with an Intrinsically Chiral Helical-Shaped Diphosphine Oxide

A one-pot,
multicomponent strategy was used to synthesize the first
example of the dirhenium carbonyl coordination complex 2, in which the two metal atoms are connected through a chiral helical-shaped
diphosphine oxide. Thanks to the flexibility of the helix of helicene 1, complex 2 was isolated in quite a good yield
as a stable compound. It was characterized by analytical and spectroscopic
techniques as well as by single-crystal X-ray analysis, which confirmed
the chemical structure and the peculiar architecture of 2. In addition, computational studies were in agreement with the transitions
observed in the experimental UV–vis spectrum, revealing the
presence of two bands with maxima at about 520 (metal-to-ligand charge
transfer) and 400 nm (IL).