Alkynyltellurolato ligands including a solvatochromic rhenium(i) complex

Abstract

Alkynyltellurolato complexes L_nM–Te–CCR (L_nM = CpFe(CO)₂, CpFe(CO)(PPh₃), Re(CO)₃(bipy); R = Ph, SiMe₃) arise via tellurium insertion into alkynyllithiums followed by metathesis with the corresponding metal halide complex. The rhenium(I) complex displays solvatochromism (hypsochromic shift in polar solvents) for the inter-ligand (TeCCR to bipy) charge transfer which is not, however, observed for the lighter analogue [Re(SeCCSiMe₃)(CO)₃(bipy)].