Ligand-based control of nuclearity in (NHC)gold(I) sulfides

N-Heterocyclic carbene (NHC) ligands support gold(I) sulfide complexes of varying nuclearity and charge. For sterically undemanding ligands, gold(I) chlorides react with sulfide to form trigold μ₃-sulfido cations as the first observed products. The ligand IMes [1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene] supports a monomeric cation, whereas the ICy-(1,3-dicyclohexylimidazol-2-ylidene-) supported cation crystallises as a dimer linked through an aurophilic interaction. The more sterically demanding IDipp [1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene] supports a terminal hydrosulfide, a (μ-hydrosulfido)digold cation, and a μ₃-sulfido cation. Use of the expanded-ring NHC 7Dipp [1,3-bis(2,6-diisopropylphenyl)-4,5,6,7-tetrahydro-1,3-diazepin-2-ylidene] allows the isolation of a neutral digold sulfide.

The coordination behavior of 2,3-bis(diphenylphosphino)maleic-N-phenylimide towards copper, silver, gold and palladium

In the coordination sphere of copper, silver and palladium 2,3-bis(diphenylphosphino)maleic-N-phenylimide can act as a radical, non-innocent ligand.

Hydrogenase biomimics containing redox-active ligands: Fe2(CO)4(μ-edt)(κ2-bpcd) with electron-acceptor 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) as a potential [Fe4–S4]H surrogate

The diiron centre and redox-active diphosphine are reduced in separate steps but there is little evidence of intramolecular electron transfer between the two.

[Au12(PPh2)2S4(L2)4]2+ (L2 = 3,4-bis(diphenylphosphino)-2,5-bis(trimethylsilyloxy)furan): an Au12 unit protected by modified maleic anhydride phosphine ligands

The reaction of the bis(dichlorogold) complex of 2,3-bis(diphenylphosphino)maleic anhydride (L1) with S(SiMe₃)₂ in the presence of NaBPh₄ yields the ionic dodecanuclear cluster compound [Au₁₂(PPh₂)₂S₄(L2)₄](BPh₄)₂ (1). During the formation of 1, the initial ligand L1 is transformed into the doubly sylilated derivative, 3,4-bis(diphenylphosphino)-2,5-bis(trimethylsilyloxy)-furan (L2). The presence of bridging PPh₂ groups is a result of the transformation of L1 in the coordination sphere of Au(i). Compound 1 was characterized by single crystal X-ray diffraction and electrospray-ionization (ESI) mass spectrometry.

Polynuclear cage-like Au(i) phosphane complexes based on a S2− template: observation of multiple luminescence in coordinated polyaromatic systems

Sulfido-phosphane Au(i) complexes display multiple emissions, the nature of which is determined by the distance between Au(i) and the chromophoric center.

Au108 S24 (PPh3 )16 : A Highly Symmetric Nanoscale Gold Cluster Confirms the General Concept of Metalloid Clusters

The reduction of (Ph₃ P)AuCl with NaBH₄ in the presence of HSC(SiMe₃ )₃ , leads to one of the largest metalloid gold clusters: Au₁₀₈ S₂₄ (PPh₃ )₁₆ (1). Within 1 an octahedral Au₄₄ core of gold atoms arranged as in Au metal is surrounded by 48 oxidized Au atoms of an Au₄₈ S₂₄ shell, a novel building block in gold chemistry. The protecting Au₄₈ S₂₄ shell is completed by additional 16 Au(PPh₃ ) units, leading to a complete protection of the gold core. Within 1 the Au-Au distances get more molecular on going from the center to the ligand shell. Cluster 1 represents novel structural motives in the field of metalloid gold clusters which also are partly typical for metal atoms in metalloid clusters: M_n R_m (n>m).