Structural and magnetic phase transitions in EuLaFe(BO) (x = 0, 0.18).

The crystal structures and hyperfine magnetic parameters of EuFe(BO) and mixed EuLaFe(BO) were studied over a wide temperature range in order to analyze correlations of the structural and magnetic features and the phase transitions in multiferroic compounds of the rare-earth iron borate family. The chemical compositions of the crystals are reported from X-ray fluorescence analysis. The crystal structures of EuFe(BO) and EuLaFe(BO) were determined using single-crystal X-ray diffraction in the temperature range 25-500 K.

A high-pressure single-crystal X-ray diffraction study of potassium guaninate hydrate, K·CHNO·HO.

The crystal structure of potassium guaninate hydrate, K·CHNO·HO, was studied in the pressure range of 1 atm to 7.3 GPa by single-crystal diffraction using synchrotron radiation and a laboratory X-ray diffraction source. Structural strain was compared to that of the same salt hydrate on cooling, and in 2Na·CHNO·7HO under hydrostatic compression and on cooling.

Crystal structure of bismuth-containing NdFe(BO) in the temperature range 20-500 K.

Neodymium iron borate NdFe(BO) is an intensively studied multiferroic with high electric polarization values controlled by a magnetic field. It is characterized by a large quadratic magnetoelectric effect, rigidity in the base plane and a rather strong piezoelectric effect. In this work, the atomic structure of (NdBi)Fe(BO) was studied by single-crystal X-ray diffraction in the temperature range 20-500 K (space group R32, Z = 3).

Flux growth, structure refinement and Mössbauer studies of FeGaBO single crystals.

High-quality FeGaBO single crystals (0.0 ≤ x ≤ 1.0) in the form of basal plates were synthesized by the flux technique.

Crystal structure and structural phase transition in bismuth-containing HoFe(BO) in the temperature range 11-500 K.

An accurate single-crystal X-ray diffraction study of bismuth-containing HoFe(BO) between 11 and 500 K has revealed structural phase transition at T = 365 K. The Bi atoms enter the composition from BiMoO-based flux during crystal growth and significantly affect T. The content of Bi was estimated by two independent methods, establishing the composition as (HoBi)Fe(BO).

Small Gold(I) and Gold(I)-Silver(I) Clusters by C-Si Auration.

Auration of o-trimethylsilyl arylphosphines leads to the formation of gold and gold-silver clusters with ortho-metalated phosphines displaying 3c-2e Au-C-M bonds (M=Au/Ag). Hexagold clusters [Au L ](X) are obtained by reaction of (L-TMS)AuCl with AgX, whereas reaction with AgX and Ag O leads to gold-silver clusters [Au Ag L ](X) . Oxo-trigold(I) species [Au O] were identified as the intermediates in the formation of the silver-doped clusters.

Gold(I) Carbenoids: On-Demand Access to Gold(I) Carbenes in Solution.

Chloromethylgold(I) complexes of phosphine, phosphite, and N-heterocyclic carbene ligands are easily synthesized by reaction of trimethylsilyldiazomethane with the corresponding gold chloride precursors. Activation of these gold(I) carbenoids with a variety of chloride scavengers promotes reactivity typical of metallocarbenes in solution, namely homocoupling to ethylene, olefin cyclopropanation, and Buchner ring expansion of benzene.

Polynuclear Gold [Au(I) ]4 , [Au(I) ]8 , and Bimetallic [Au(I) 4 Ag(I) ] Complexes: C-H Functionalization of Carbonyl Compounds and Homogeneous Carbonylation of Amines.

The synthesis of tetranuclear gold complexes, a structurally unprecedented octanuclear complex with a planar [Au(I) 8 ] core, and pentanuclear [Au(I) 4 M(I) ] (M=Cu, Ag) complexes is presented. The linear [Au(I) 4 ] complex undergoes C-H functionalization of carbonyl compounds under mild reaction conditions. In addition, [Au(I) 4 Ag(I) ] catalyzes the carbonylation of primary amines to form ureas under homogeneous conditions with efficiencies higher than those achieved by gold nanoparticles.

Emission tuning in dinuclear gold complexes with diphosphanes containing alkyne and/or oligophenylene spacers.

Reaction of the diphosphanes P∼P [PPh(2)(C(6)H(4))(n)PPh(2) (n = 1-5) and PPh(2)C[triple bond, length as m-dash]C(C(6)H(4))C[triple bond, length as m-dash]CPPh(2)] with [AuX(tht)] (X = Cl, C(6)F(5)) in a 1 : 2 molar ratio affords dinuclear luminescent complexes of formula [(AuX)(2)(P∼P)]. The photoemissive properties of these complexes are mainly controlled by the presence of the diphosphane ligand, specifically by the phenylene spacers of the diphosphanes. At room temperature fluorescent (IL) processes dominate the emissions, both in solution and in the solid state.

Synthesis, structural characterization, photophysical properties and theoretical analysis of gold(I) thiolate-phosphine complexes.

A series of luminescent dinuclear neutral complexes of stoichiometry [(AuSPh)(2)(PPh(2)-(C(6)H(4))(n)-PPh(2))] (n = 1, 2, 3) as well as their tetranuclear cationic derivatives [(Au(2)SPh)(2)(PPh(2)-(C(6)H(4))(n)-PPh(2))(2)](PF(6))(2) are reported. Their crystal structures have been elucidated by X-ray studies. These studies indicate that, for the dinuclear species, only when n = 1 the molecules exhibit intermolecular aurophilic interactions.

Synthesis, electrochemical and theoretical studies of the Au(I)-Cu(I) heterometallic clusters bearing ferrocenyl groups.

Treatment of the polymeric alkynyl compounds (AuC2R)n (R = Fc, C6H4Fc; Fc = ferrocenyl) with the diphosphine PPh2C6H4PPh2 gave complexes (RC2Au)PPh2C6H4PPh2(AuC2R) (1, R = Fc; 2, R = C6H4Fc) with end-capped ferrocenyl groups. The reactions of 1 or 2 with Cu(NCMe)4PF6 result in formation of the heterotrimetallic aggregates [{Au3Cu2(C2R)6}Au3(PPh2C6H4PPh2)3](PF6)2 (3, R = Fc; 4, R = C6H4Fc), which consist of the alkynyl clusters [Au3Cu2(C2R)6]- wrapped by the cationic [Au3(PPh2C6H4PPh2)3]3+ belt. The novel compounds were characterized by NMR spectroscopy and ESI-MS measurements.

Crystallochemical formula as a tool for describing metal-ligand complexes - a pyridine-2,6-dicarboxylate example.

Compounds (299) containing 494 symmetrically independent pyridine-2,6-dicarboxylate moieties have been investigated. Among them the structures of Na(3)[Nd(Pydc)(3)].14H(2)O and Na(3)[Er(Pydc)(3)].