Spectroscopic, Structural and Theoretical Investigation of Alkenyl Ruthenium Complexes Supported by Sulfur–Nitrogen Mixed‐Donor Ligands

Alkenyl complexes of platinum group metals: a platform for diverse reactivity patterns

“…In all the cases complexation occurs to form four‐membered nitrogen–sulfur chelates with the pendant amino or hydroxy functionality playing no role in coordination, and this observation was further supported by theoretical calculations. These show that a complex displaying the nitrogen–sulfur chelate is of significantly lower energy than one bonded to the ligand through two sulfur donors, despite lone pairs being available in both cases . The Ir(I) adduct Tp Me2 Ir(C 2 H 4 )(DMAD) ( 2 ; DMAD = MeO 2 CC≡CCO 2 Me) was prepared by the low‐temperature reaction of compound 1 with DMAD.…”

“…These show that a complex displaying the nitrogen-sulfur chelate is of significantly lower energy than one bonded to the ligand through two sulfur donors, despite lone pairs being available in both cases. [74] The Ir(I) adduct Tp Me2 Ir(C 2 H 4 )(DMAD) (2; DMAD = MeO 2 CC≡CCO 2 Me) was prepared by the low-temperature reaction of compound 1 with DMAD. It is stable up to 10°C, when it reacts with a second equivalent of the alkyne to give an alkenyl-Ir hydride complex 3, as depicted in Scheme 1.…”

Biologically active 2-thione-4,6-diamino-5-hydroxypyrimidine transition metal complexes

“…The inhibition activity of the silver(I) complexes may be attributed to their inhibition of the replication of the microorganisms DNA by interacting with enzyme prosthetic groups, altering the microbial metabolism and their ability to form hydrogen bonds with the cell wall and cell constituents [42,44]. Also, it is reported that the substituted 2-thiopyrimidines inhibit the synthesis of t-RNA in E. coli [6,13,26]. Thus, it is expected that the high biological activity of [Ag(phen)(HTDAHP)] + is due to the presence of both phen and 2-thiopyrimidine rings (unsaturated nitrogen base) in the complex.…”

“…The coordination chemistry of 4-amino-2-thiopyrimidine has been explored with a number of transition metals [9][10][11][12][13]. In addition, substituted 2-thiopyrimidines have an N-C-S moiety that offers the possibility of forming homo-or hetero-binuclear complexes [14].…”

Non‐innocent Behaviour of Dithiocarboxylate Ligands Based on N‐Heterocyclic Carbenes

“…In summary, the compounds reported herein are some of the first known for the fascinating class of zwitterionic dithiocarboxylate ligands. The three NHC·CS 2 betaines under investigation have been shown to exhibit reliable reactivity as conventional dithio ligands, [21] however the valuable steric tunability of the ligands can also cause them to display noninnocent behaviour. Both these aspects are demonstrated in their coordination chemistry with the ruthenium s-vinyl complexes employed herein.…”