Abstract
A series of iridium(I) and rhodium(I) carbonyl phosphine complexes bearing bis(N-heterocyclic carbene)borate ligands [H2B(ImtBu)2]Rh(CO)(PPh3) (5), [F2B(ImtBu)2]Rh(CO)(PPh3) (6), [F2B(ImtBu)2]Ir(CO)(PPh3) (7), [H2B(ImtBu)2]Rh(CO)(PCy3) (8), [F2B(ImtBu)2]Rh(CO)(PCy3) (9), and [F2B(ImtBu)2]Ir(CO)(PCy3) (10) (H2B(ImtBu)2 = dihydrobis(3-tert-butylimidazol-2-ylidene)borate; F2B(ImtBu)2 = difluorobis(3-tert-butylimidazol-2-ylidene)borate) have been prepared and characterized. IR stretching values of the CO ligands, the values of NMR coupling constants JRh–P, and electrochemical data are rationalized by the electronic effects of the bis(3-tert-butylimidazol-2-ylidene)borate and phosphine ligands. The results show that the σ donor capacity of bis(3-tert-butylimidazol-2-ylidene)borate is stronger than those of the analogous isoelectronic bis(pyrazolyl)borate (Bp−) and acetylacetonato (acac−) ligands. The molecular structures of complexes 6–10 have been determined by single-crystal X-ray diffraction, which showed square-plane geometries around the metal centers.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
