The quality of diffraction data obtained using silver and molybdenum microsources has been compared for six model compounds with a wide range absorption factors. experiments were performed on two 30 W air-cooled Incoatec IµS microfocus sources multilayer optics mounted Bruker D8 goniometer SMART APEX II CCD detector. All analysed, processed refined standard software. results show that Ag

The cooling of a crystal in combination with the use protecting oil facilitates handling and transfer to diffractometer even very sensitive material. method is explained required device described this work. Basic advantages technique are simplicity freedom access sample without need for sophisticated glassware. Therefore, technique, suitable manipulation temperature range between room 193 K, much more efficient than those involving capillaries.

A guiding light is sufficient to switch back and forth between the flexible stretched, rigid form of a self-assembled coordination cage based on two square-planar-coordinated PdII ions four ligands with photochromic dithienylethene (DTE) backbone. The light-driven interconversion clean reversible allows control encapsulation release guest [B12F12]2−. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or...

Stable? You can bottle it! The base-stabilized dichlorosilylene L1SiCl2 (see picture; L1=1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) is stable at room temperature. undergo a reaction with diphenylacetylene to form trisilacyclopentene derivative. These compounds have been characterized by X-ray crystallography and computational studies.

Two new approaches for synthesizing RSiCl, (R = PhC(NtBu)2) are reported by the reaction of RSiHCl2 with bis-trimethyl silyl lithium amide and N-heterocyclic carbene respectively. In former method silylene is produced in 90% yield. The was treated biphenyl alkyne to afford disilacyclobutene system. This a rare example two five-coordinate silicon centers arranged adjacent each other four-membered ring. Furthermore, we fluorinated ring trimethyltin fluoride obtain fluoro substituted disilacyclobutene.

A trapped silicon atom: The compound (L:)2Si with low-valent was synthesized from its dichloride biradical precursor (L:)2SiCl2 by reduction KC8. Theoretical analysis suggest that there are two donor–acceptor σ bonds L:→Si←:L. There is one lone-pair orbital at Si and π which features significant π-back-donation L:←Si→:L giving short SiC bonds.

Aerobic oxidative CH functionalizations of weakly coordinating benzoic acids have been accomplished with versatile ruthenium(II) biscarboxylates under ambient oxygen or air. Mechanistic studies identified the key factors controlling elementary step oxidation ruthenium(0) complex.

Packed in like sardines: Three BF4− ions are packed into the three cavities of an interpenetrated dimer a coordination cage (see scheme). While inner ion is tightly bound inside central position, loosely outer anions can be replaced with halide by allosteric binding mechanism and concerted structural change. In particular, Cl− great affinity.

We describe a novel development of MW-determination by using an external calibration curve approach with normalized diffusion coefficients.

Abstract Ruthenium(II)‐catalyzed meta ‐selective C−H (di)fluoromethylation was accomplished by phosphine and carboxylate cooperation. The remote functionalization characterized ample substrate scope, thereby setting the stage for ‐(di)fluoromethylation through facile cleavage.

A detailed study on bromination and subsequent imidization of perylene bisanhydride with cyclohexylamine is reported. The present results reveal that previously reported 1,7-difunctionalized bisimides are presumably contaminated the respective 1,6 regioisomers. N,N'-Dicyclohexyl-1,7-dibromoperylene bisimide 1,7-3 obtained for first time in isomerically pure form, its structure unequivocally confirmed by X-ray analysis. By using regioisomerically 1,7-dibromoperylene 1,7-3,...

The reaction of silver thiolates with Se(SiMe3)2 or S(SiMe3)2 in the presence bidentate phosphanes leads to formation very large cluster molecules distorted spherical metal–chalcogenide cores diameters 2–4 nm. surfaces these are protected by thiolate and phosphane ligands. Structural analyses show a higher degree disorder increasing number Ag atoms. compound highest content (see figure) has an idealized formulation [Ag490S188(StC5H11)114].

Crystalline nBuLi is also hexameric; this same degree of oligomerization was determined years ago in solutions hydrocarbons. Six Li atoms form a distorted octahedron, six whose triangular faces are capped by nBu groups (see structure depicted). The unusual arrangement the β-C indicates interactions with atoms. In contrast, tBuLi forms Td-symmetric tetramer solid state.

Experiments are described in which a direct comparison was made between conventional 2 kW water-cooled sealed-tube X-ray source and 30 W air-cooled microfocus with focusing multilayer optics, using the same goniometer, detector, radiation (Mo K α), crystals software. The beam characteristics of two sources were analyzed quality resulting data sets compared. Incoatec Microfocus Source (IµS) gave narrow approximately Gaussian-shaped primary profile, whereas Bruker AXS source, equipped graphite...

Al4Se4 and Al4Te4 cubes are the central structural units of heterocubanes [(Cp*AlSe)4] [(Cp*AlTe)4] 1 (structure shown on right). These compounds were formed by reaction tetrameric AlI compound [(Cp*Al)4] with elemental selenium tellurium, respectively. The driving force this smooth is conversion from to AlIII. Cp* = η5-C5Me5

The cyclic alkyl(amino) carbene (cAAC:)-stabilized acyclic germylones (Me2-cAAC:)2Ge (1) and (Cy2-cAAC:)2Ge (2) were prepared utilizing a one-pot synthesis of GeCl2(dioxane), cAAC:, KC8 in 1:2:2.1 molar ratio. Dark green crystals compounds 1 2 produced 75 70% yields, respectively. reported methods for the preparation corresponding silicon turned out to be not applicable case germanium. single-crystal X-ray structures feature C-Ge-C bent backbone, which possesses three-center two-electron...

We have previously shown that the self-assembly of dibenzosuberone-based bis-monodentate pyridyl ligands L(1) with Pd(II) cations leads to quantitative formation interpenetrated coordination cages [BF4@Pd4L(1)8]. The BF4(-) anion inside central cavity serves as a template, causing outer two pockets show tremendous affinity for allosteric binding small chloride anions. Here we derivatization ligand backbone bulky aryl substituent allows us control dimerization and hence guest-binding ability...

Molecular encapsulation processes under the control of an external trigger play a major role in biological signal transduction and enzyme catalysis. Here, we present artificial mimic controllable host system that forms via self-assembly from simple bis-monodentate ligand Pd(II) cations. The resulting interpenetrated double cage features three consecutive pockets which initially contain one tetrafluoroborate anion, each. Activation this with two halide anions triggers conformational change...

Silicon becomes colored: Stable biradicals were prepared from an N-heterocyclic carbene stabilized SiCl2 and a cyclic alkyl(amino)carbene, characterized as two polymorphs. The deep-blue crystals of one polymorph are stable upon exposure to air for about week, while the solution in THF decomposes rapidly when exposed air. In side reaction, different species react with each other under CH activation CC bond formation presence biradical. As service our authors readers, this journal provides...

Herein we report on the reactivity of stable germanium(II) hydride LGeH (L = CH{(CMe)(2,6-iPr(2)C(6)H(3)N)}(2)) (2), which contains a low-valent germanium atom. 2 is prepared from corresponding chloride LGeCl (1) using H(3)Al x NMe(3) or K[HB(iBu)(3)] in toluene. The reaction with carbon dioxide toluene at room temperature affords ester formic acid, LGe-O-C(O)H (3), formed by insertion into germylene hydrogen bond. also reacts alkynes to give first germanium(II)-substituted alkenes (4, 5,...

This paper provides a short introduction to the basics of electron density investigations. The two predominant approaches for modelling and various interpretations distributions are presented. Their potential translations into chemical concepts explained. focus article lies on deduction properties from charge studies in some selected main group compounds. relationship between obtained numerical data commonly accepted simple unfortunately is not always straightforward, often chemist relies...

Cyclic alkyl(amino) carbene stabilized two- and three-coordinate Fe(I) complexes, (cAAC)2FeCl (2) [(cAAC)2Fe][B(C6F5)4] (3), respectively, were prepared thoroughly studied by a bouquet of analytical techniques as well theoretical calculations. Magnetic susceptibility Mössbauer spectroscopy reveal the +1 oxidation state S = 3/2 spin ground iron in both compounds. 2 3 show slow magnetic relaxation typical for single molecule magnets under an applied direct current field. The high-frequency EPR...