Tuning the Au–Au interactions by varying the degree of polymerisation in linear polymeric Au(i) N-heterocyclic carbene complexes

Abstract

Gold(I) N-heterocyclic carbene (Au(I) NHC) polymers were successfully synthesised with alkyl and alkoxy spacers, wherein polymers with different degrees of polymerisation were isolated for the first time by varying the...

Auranofin Targeting the NDM-1 Beta-Lactamase: Computational Insights into the Electronic Configuration and Quasi-Tetrahedral Coordination of Gold Ions

“…In one case, two oxygens are bound to the Au1–Au2 scaffold; one oxygen is bound at a short distance (1.95 Å) with Au1, thus presumably being a hydroxyl group, whereas another oxygen is coordinated at Au2 at a longer distance (2.43 Å), thus more likely corresponding to a water ligand. The distance between the two Au centers is 3.76 Å ( Figure 3 b), which is longer than those detected in various crystallographic studies in the range 2.47–3.49 Å ( Table S1 ) [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. These data suggest that gold metal ions are not bound and held in place by the surrounding protein residues.…”

Luminescent Behavior of Liquid–Crystalline Gold(I) Complexes Bearing a Carbazole Moiety: Effects of Substituent Bulkiness

“…The UV-vis absorption spectra of compounds Cbz-H, Cbz-Br, and Cbz-t-Bu were recorded in dilute CH 2 Cl 2 solution. Cbz-H (2.1 × 10 −5 mol L −1 ), Cbz-Br (4.3 × 10 −5 mol L −1 ), and Cbz-t-Bu (3.3 × 10 −5 mol L −1 ) exhibited absorption bands at 293, 310, and 297 nm, respectively (Figure 4a), which may be attributable to a metal-to-ligand charge transfer (MLCT) transition or a ligand-based π-π* transition [5,27,28]. All complexes also showed smaller absorption peaks with a vibronic structure at 340-360 nm.…”

“…However, the generation of white light commonly requires the simultaneous emission of the three primary RGB colors (red, green, and blue) or at least two complementary colors [4]. Moreover, achieving white room temperature phosphorescence (RTP) from a single molecule is highly challenging because the different radiation pathways involved in the emission process can affect each other [5].…”

“…This phenomenon, known as aggregation-caused quenching (ACQ), is common in organometallic molecules with π-electron systems and prevents their practical use. Owing to the essential contribution of molecular aggregation to luminescence properties, aggregated structures play an important role in luminescence behavior [5][6][7][8][9][10]. Liquid crystals (LCs) are a unique class of soft materials that flow like liquids and possess a long-range orientational order similar to that of crystals [7,[11][12][13][14].…”

“…The emission observed in Au(I) complexes results from an interatomic Au-Au interaction; thus, Au(I) complexes exhibit the luminescence mainly from their aggregates and have been known as the AIE-active material. The Au-Au interaction as well as the luminescence behavior can be tuned via not only modification of the chemical structure around Au atoms but also by controlling the aggregated structures [5]. For instance, previously synthesized Au(I) complexes with isocyanides and phenylacetylene ligands exhibited interesting AIE properties [16].…”