Rhenium and technetium complexes with N-heterocyclic carbenes – A review

Heterocyclic Carbenes: Synthesis and Coordination Chemistry

“…In addition to complexes of all the transition-metals [31,33,34] and adducts with a large number of main-group elements, [41] carbene complexes of the lanthanides, [232] uranium, [233] and of the radioactive technetium isotope 99 Tc are known. [234] A large number of these complexes have found application in catalytic reactions [33,34] such as the C-C cross-coupling [35] or the olefin metathesis. [36,37] Recent studies deal with complexes containing N-heterocyclic carbenes substituted at the nitrogen atoms with carbohydrate [235] or dendritic groups.…”

N-heterocyclic carbene complexes of Group 6 metals

“…However, the chemistry of NHC ligand with high-valent metals remains relatively under-developed [52,154]. …”

“…Although many NHCs with different backbones and topologies have been reported [48,49], the NHC ligand motifs of Group 6 complexes are restricted to the most commonly used NHC with imidazole core, and a few M a n u s c r i p t Some of the η 5 -Cp Mo(II)-NHC complexes and some Mo(VI), W(VI) and Cr-NHC were found in recent reviews in the catalytic olefin epoxidation with η 5 -Cp Mo complexes [50,51], transition metal NHC complexes in high oxidation states [52] and metal catalyzed olefin oligomerization and polymerization [53,54]. However, there has been no dedicated and comprehensive review in Group 6 metal NHC complexes.…”

Synthesis, structure and luminescent properties of rhenium(I) carbonyl complexes containing pyrimidine-functionalized N-heterocyclic carbenes

“…There have been several well-established synthetic methods for the preparation of Re(I)-NHC compounds [34,42,43]. In the current work, we employed a simple transmetallation method, which has been used in our group to prepare a series of Re(I)-NHC complexes with pyridine-functionalized NHC ligands [35] for the preparation of 1-4.…”