Properties and prospects for rhenium(i) tricarbonyl N-heterocyclic carbene complexes

Abstract

Rhenium tricarbonyl complexes bound to N-heterocyclic carbene ligands are emerging as a new class of complexes with promising applications in a wide variety of areas.

Long‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties

“…The chloro analogues B 1,2 were obtained in a similar way from chloride salt 4 in 54% yield. Notably, the 1 H NMR spectra of the d 6 -Re(I) compounds revealed the loss of the precarbenic proton and the appearance of two sets of signals corresponding to two diastereoisomers (in ratios of 83:17 for A 1,2 and 67:33 for B 1,2 , as further confirmed by HPLC), thus suggesting Scheme 1. Synthetic access to helicene-NHC-Re complexes A and B. i) 2-Brpyridine, K2CO3, CuI (cat.…”

Rhenium N-heterocyclic carbene complexes block growth of aggressive cancers by inhibiting FGFR- and SRC-mediated signalling

“…Rhenium is a transition metal that has been recently studied for the development of novel anticancer agents [8][9][10]. Its anticancer activity was first observed with tricarbonyl bismine complexes in HeLa cells [1,4,[11][12][13].…”

Effect of “X” Ligands on the Photocatalytic Reduction of CO2 to CO with Re(pyridylNHC‐CF3)(CO)3X Complexes

“…Ligands play critical roles in the modulation of homogeneous complex reactivity, and NHC (N-heterocyclic carbene) ligands often give homogeneous catalysts with increased durability. [11] Furthermore, the strong electron donating properties of these ligands to the metal center may assist in enhancing the performance of reductive catalysis. In fact, we recently demonstrated pyridyl-NHC (pyNHC) ligated Re complexes such 1.5G).…”

“…A series of control experiments removing CO 2 , BIH, or catalyst reveals all components to be necessary for catalysis (Table 2, entries 7-9). Introduction of Bror Clto the reaction mixture as a tetrabutylammonium (TBA) salt with Re(pyNHC-PhCF 3 )(CO) 3 Br (2) led to a lower TON (25 or 27 relative to 32 with no added salt) and a lower TOF (30 or 45 relative to 48 h -1 with no added salt) (Table 2, entries[10][11]. This lower performance is expected if the anionic ligand is involved in any deactivation pathways resulting from association of the ligand to an active catalyst species.…”