Synthesis of Tricarbonyl Re(I) Complexes of N and P Donor Ligands

Abstract

Reaction of 1,10-phenanthroline-5,6-dione V with 1,3-diphenyl propan-2-one afforded the keto-alcohol VI. Treatment of VI with alkynes, di(3-thienyl) acetylene and di(4-tert-butylphenyl) acetylene yielded 5,8-diphenyl-6,7-di(3-thienyl)-1,12-diaza-triphenylene L 1 and 6,7-di(4-tert-butylphenyl)-5,8-diphenyl-1,12-diazatriphenylene L 2 , respectively. [ReCl(CO) 5 ] reacted with N^N-donor ligands L 1 -L 6 to produce fac-tricarbonylrhenium(I) complexes ( 20)-( 25) in good yields as coloured solids. Treatment of [ReCl(CO) 5 ] with the bulky P^N ligand L 7 formed the neutral complex fac-[ReCl(CO) 3 (L 7 )] ( 26) whilst with the azine diphosphine Z,Z-L 8 afforded the cationic complex fac-[Re(CO) 3 (E,Z-L 8 )]Cl (27a), where L 8 is a tridentate ligand. The chloride anion of the complex (27a) was replaced by treating it with NH4PF6 into fac-[Re(CO) 3 (E,Z-L 8 )]PF 6 (27b). Above complexes were characterized by a combination of elemental analysis, IR, Mass and NMR spectroscopy.

Syntheses of Au(III) and Au(I) Complexes of 3,4,5,6-Tetraphenyl-2,2´-bipyridine

“…Some of the basic ligand types (I-VII) are depicted in Figure 4. Facile synthetic routes to cyclometallated Rh(III), Pd(II) and Pt(II) complexes (Ollangnier et al, 2008;Perera, 2018;2020a) of 3,4,5,6-tetraphenyl-2,2´-bipyridine (LH) VIII and noncyclometallated complexes of it with Cu(I), Ag(I) and Re(I) were reported (Perera, 2020b;2021;2022). Thus, it is interesting to explore the chemistry of gold with this bulky bipyridine ligand VIII (Scheme 1).…”