Bis{[2-(dimethyl­amino)­phen­yl](trimethyl­sil­yl)meth­yl}cadmium

In the crystal structure of the title compound, [Cd(C12H20NSi)2], the CdII cation is coordinated by two N and two C atoms within an irregular polyhedron. The four Cd—X (X = C, N) bond lengths are in the range 2.166 (4)–2.513 (4) Å

μ-Bis(diphenyl­arsino)methane-κ2 As:As′-bis­[chloridogold(I)]

The title structure, [Au2Cl2(C25H22As2)], consists of discrete mol­ecules disposed about a crystallographic twofold axis. The Au atom exhibits a nearly linear coordination by As and Cl atoms. Au⋯Au inter­actions [3.4285Å(4) Å] and a weak intermolecular C—H⋯Cl hydrogen bond are present

catena-Poly[[diaqua­calcium(II)]-di-μ-2-chloro­nicotinato]

The itle compound, [Ca(C6H3ClNO2)2(H2O)2]n, contains polymeric chains extending along [100] that are generated by inversion centres. The Ca2+ ions are bridged by 2-chloronicotinate groups and exhibit an eight-coordination by six carboxylate O atoms of four different 2-chloronicotinate ligands and two O atoms of water molecules. In the crystal structure, inter­molecular O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds result in the formation of a supra­molecular network structure. The π–π contacts between the 2-chloro­nicotinate rings [centroid–centroid distances = 3.875 (3) and 3.701 (3) Å] may further stabilize the structure

Insights into the mechanism for gold catalysis: behaviour of gold(i) amide complexes in solution

We report the synthesis and activity of new mononuclear and dinuclear gold amide complexes . The dinuclear complexes and were characterised by single crystal X-ray analysis. We also report solution NMR and freezing point depression experiments to rationalise their behaviour in solution and question the de-ligation process invoked in gold catalysis

Gender-Expertise in der beruflichen Praxis: ausgewählte Ergebnisse des europäischen Forschungsprojekts 'Employment and Women's Studies'

Die Verfasserin legt Ergebnisse des Forschungsprojekts 'Employment and Women's Studies. The Impact of Women's Studies Training on Women's Employment in Europe' vor, die auf einer quantitativen und qualitativen Befragung von Studentinnen und Absolventinnen des Studiengangs Gender Studies beruhen. Folgende Themenbereiche werden behandelt: (1) Studium und Erwerbstätigkeit vor und während des Studiums; (2) Beschäftigungserwartungen und Arbeitsfelder; (3) Gender-Expertise in der beruflichen Praxis. Die Berufschancen für Absolventinnen dieses Studiengangs, so wird gezeigt, entsprechen dem in den Geistes- und Sozialwissenschaften allgemein gängigen Muster. (ICE

Designing molecules to bypass the singlet-triplet bottleneck in the electroluminescence of organic light-emitting-diode materials

Electroluminescence in organic light emitting diode (OLED) materials occurs via the recombination of excitonic electrons-hole pairs Only the singlet excitons of commonly used OLED materials, e.g., Aluminum trihydroxyquinoline (AlQ$_3$), decay radiatively, limiting the external quantum efficiency to a maximum 25%. Thus 75% of the energy is lost due to the triplet bottleneck for radiative recombination. We consider molecules derived from AlQ$_3$ which bypass the triplet bottleneck by designing structures which contain strong spin-orbit coupling. As a first stage of this work, groundstate energies and vertical excitation energies of Al-arsenoquinolines and Al-boroarsenoquinolines are calculated. It is found that the substitution of N by As leads to very favourable results, while the boron substitution leads to no advantage.Comment: 4 pages, 4 figue

An element through the looking glass: Exploring the Au-C, Au-H and Au-O energy landscape

Gold, the archetypal “noble metal”, used to be considered of little interest in catalysis. It is now clear that this was a misconception, and a multitude of gold-catalysed transformations has been reported. However, one consequence of the long-held view of gold as inert metal is that its organometallic chemistry contains many “unknowns”, and catalytic cycles devised to explain gold's reactivity draw largely on analogies with other transition metals. How realistic are such mechanistic assumptions? In the last few years a number of key compound classes have been discovered that can provide some answers. This Perspective attempts to summarise these developments, with particular emphasis on recently discovered gold(III) complexes with bonds to hydrogen, oxygen, alkenes and CO ligands

Monomers, dimers, and trimers of [Au(CN)2]− in a Ba(diaza-18-crown-6)2+ coordination polymer

The structure of the title compound, poly[triaquatetra-μ-cyanido-tetracyanidobis­(1,4,10,13-tetra­oxa-7,16-diaza­cyclo­octa­deca­ne)di­barium(II)tetra­gold(I)], [Au4Ba2(CN)8(C12H26N2O4)2(H2O)3]n, displays O—H⋯N hydrogen bonding between water molecules and cyano ligands and an unusual pattern of aurophilic inter­actions that yields a monomer, dimer, and trimer of [Au(CN)2]− within the same crystal structure. In two of the five Au positions, the atom resides on a center of inversion. The overall arrangement is that of a coordination polymer assisted by aurophilic and hydrogen-bonded inter­actions

μ3-Oxido-tris­{dichlorido[1,3-bis­(1,3,5-trimethyl­phen­yl)imidazol-2-yl­idene]gold(III)} bis­(trifluoro­methane­sulfon­yl)imide–[bis­(trifluoro­methane­sulfon­yl)imide]­silver(I) (1/2)

The unusual trinuclear AuIII oxide title complex, [Au3Cl6O(C21H24N2)3](C2F6NO4S2)·2[Ag(C2F6NO4S2)], is the side product of the reaction of [1,3-bis­(1,3,5-trimethyl­phen­yl)imidazol-2-yl­idene]dichloridophenyl­gold(III) with silver bis­(trifluoro­methane­sulfon­yl)imide in the presence of traces of water. In contrast to corresponding AuI complexes, the core structure of the title compound is planar. Two silver(I) bis­(trifluoro­methane­sulfon­yl)imide units are loosely bound to the complex cation. Here the silver atoms, disordered over two positions in a 0.870 (2):0.130 (2) ratio, inter­act either with the lone pairs of three chlorine ligands or two chlorine ligands and one edge of the mesityl π-system. The crystal under investigation was a partial racemic twin

Excimer and Exciplex Formation in Gold(I) Complexes Preconditioned by Aurophilic Interactions

CITATION: Schmidbaur, H. & Raubenheimer, H. G. 2020. Excimer and Exciplex Formation in Gold(I) Complexes Preconditioned by Aurophilic Interactions. Angewandte Chemie International Education, 59(35):14748-14771. doi:10.1002/anie.201916255The original publication is available at https://onlinelibrary.wiley.com/journal/15213773Excimers and exciplexes are defined as assemblies of atoms or molecules A/A’ where interatomic/intermolecular bonding appears only in excited states such as [A2]* (for excimers) and [AA’]* (for exciplexes). Their formation has become widely known because of their role in gas-phase laser technologies, but their significance in general chemistry terms has been given little attention. Recent investigations in gold chemistry have opened up a new field of excimer and exciplex chemistry that relies largely on the preorganization of gold(I) compounds (electronic configuration AuI (5d10)) through aurophilic contacts. In the corresponding excimers, a new type of Au···Au bonding arises, with bond energies and lengths approaching those of ground-state Au@Au bonds between metal atoms in the Au0 (5d106s1) and AuII(5d9) configurations. Excimer formation gives rise to a broad range of photophysical effects, for which some of the relaxation dynamics have recently been clarified. Excimers have also been shown to play an important role in photoredox binuclear gold catalysis.https://onlinelibrary.wiley.com/doi/10.1002/anie.201916255Publishers versio