Synthesis of Silver(I) Complexes Containing N and P Donor Ligands

Abstract

Treatment of one equivalent of 3,4,5,6-tetraphenyl-2,2′-bipyridine (tpbpy) with AgClO4 afforded [Ag(tpbpy)]ClO4 (1a). Similarly, [Ag(tpbpy)]BF4 (1b) was prepared using AgBF4. Reaction of two equivalents of tpbpy with AgClO4 yielded the homoleptic Ag(I) complex [Ag(tpbpy)2]ClO4 (2). The four-coordinate heteroleptic Ag(I) complex [Ag(tpbpy)(xantphos)]ClO4 (3) containing both N and P donor ligands was prepared by treating AgClO4 with a (1:1) mixture of tpbpy and 4,5-bis(diphenylphosphino)-9,9′-dimethylxanthene (xantphos). [Ag(dmbpy)(xantphos)]ClO4 (4) (dmbpy = 6,6′-dimethyl-2,2′-bipyridine) was prepared in a similar manner. Reaction of one equivalent of xantphos with AgClO4 in acetonitrile produced the labile three-coordinate Ag(I) complex [Ag(xantphos)(MeCN)]ClO4 (5). Treatment of (5) with one equivalent of tpbpy or dmbpy afforded the heteroleptic complexes (3) and (4), respectively. Reaction of (5) with one equivalent of 4′-(4-methylphenyl)-2,2′:6′,2′′-terpyridine

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).…”