Activity and Osmotic Coefficients from the Emf of Liquid Membrane Cells. VIII. K.3[Co(CN)6], Mg3[Co(CN)6]2, and Ca3[Co(CN)6]2

The activity coefficients of K₃[Co(CN)₆], Mg₃[Co(CN)₆]₂, and Ca₃[Co(CN)₆]₂,are examined. The results highlight close similarity with the correspondinghexacyanoferrate (III) salts. On dilution, K₃[Co(CN)₆], like K₃[Fe(CN)₆], approachesthe limiting law from the upper side, while Mg₃[Co(CN)₆]₂ and Ca₃[Co(CN)₆]₂tend to the limiting law from the opposite side, like Mg₃[Fe(CN)₆]₂,Ca₃[Fe(CN)₆]₂, Sr₃[Fe(CN)₆]₂, and Ba₃[Fe(CN)₆]₂. Both kinds of behavior agreewith theory for a model of hard spheres bearing electric charges +1 and –3 or+2 and –3, respectively. The paramater values of the Pitzer equation for activityand osmotic coefficients are reported.     

Synthesis,Structures, and Properties of Lanthanide Complexes with Pyrimidine‐2‐carboxylic Acid

Six lanthanide complexes [Ln(pmc)₂NO₃]_n [Hpmc = pyrimidine‐2‐carboxylic acid, Ln = La ( 1 ), Pr ( 2 )], [Ln(pmc)₂(H₂O)₃]NO₃ · H₂O [Ln = Eu ( 3 ), Tb ( 4 ) Dy ( 5 ), Er ( 6 )] were synthesized by the reactions of lanthanide nitrate and pyrimidine‐2‐carboxylic acid in water at room temperature. These complexes were characterized by single‐crystal X‐ray diffraction analysis, elemental analysis, IR, circular dichroism (CD) and fluorescence spectra. Structure analysis shows that complexes 1 and 2 are isostructural with P4₃2₁2 space group, whereas isostructural complexes 3 – 6 belong to the P2₁/c space group. In complexes 1 and 2 , the central metal atoms are coordinated by nitrates and pmc^–, which are self‐assembled to construct a 3D porous network with 6₂.6₂.6₂.6₂.6₂.6₂ (6⁶) topology. In complexes 3 – 6 , H₂O and pmc^– ligands are coordinated and the complexes exhibit a one‐dimensional zigzag chain, which is further expanded into a 3D structure by hydrogen bonding. In addition, the circular dichroism of 1 and 2 proves that the two complexes are both chiral with achiral ligand of Hpmc. Luminescent measurements of compounds 3 – 5 indicate that the characteristic fluorescence of Eu³⁺, Tb³⁺, and Dy³⁺ are observed.     

Complex salts with participation of [Rh(NH<Subscript>3</Subscript>)<Subscript>6</Subscript>]<Superscript>3+</Superscript> cations

Four complex salts with the polyatomic [Rh(NH₃)₆]³⁺ cation are synthesized and studied by X-ray diffraction. The crystallographic characteristics of [Rh(NH₃)₆](WO₄)Cl are determined and the structures of [Rh(NH₃)₆]Cl₃, [Rh(NH₃)₆](ReO₄)₃·2H₂O, and [Rh(NH₃)₆](MoO₄)Cl·3H₂O are solved. The features of mutual packing of the fragments are studied.     

Double-ionization energies of fluorinated benzene molecules

Results are reported of an experimental determination by double-charge transfer spectroscopy of the previously unknown double-ionization energies of the fluorinated benzene molecules C₆H₅F, l,2-C₆H₄F₂, 1,3-C₆H₄F₂, 1,4-C₆H₄F₂, 1,2,3-C₆H₃F₃, 1,2,4-C₆H₃F₃, 1,3,5-C₆H₃F₃, 1,2,3,4-C₆H₂F₄, 1,2,3,5-C₆H₂F₄, 1,2,4,5-C₆H₂F₄, and C₆HF₅. The data are remarkably similar; the lowest double-ionization energies for all the molecules are within ±0.5 of 25.7 eV, and the data for higher energies suggest that the distributions of electronic state energies for the dications of the molecules show only small variations.     

Die Reaktionen von Benzoylierungsmitteln mit Phosphoriger Säure

Reactions of Benzoylating Agents with Phosphorous Acid H₃PO₃ reacts with (C₆H₅CO)₂O to yield C₆H₅C(OH)(PO₃H₂)₂ 1 . In contrast, the reaction with C₆H₅COCl proceeds with the formation of C₆H₅CCl(PO₃H₂)₂ 2 and p-ClC₆H₄CH(PO₃H₂)₂ 3 . The best yields of 2 and 3 are obtained, if the reaction are carried out under pressure. 2 is rapidly hydrolysed in alkaline solution at elevated temperatures to 1 .     

Synthesis of 3-alkyl-6-phenyl-4(3H)-pteridinones and their 8-oxides. Potential substrates of xanthine oxidase

Synthetic routes for the preparation of 3-alkyl-6-phenyl-4(3H)-pteridinones 6 and their corresponding 8-oxides 5 (R = CH₃, C₂H₅, (CH₂)₂CH₃, (CH₂)₃CH₃, CH(CH₃)C₂H₅, CH(CH₃)₂ and CH(C₂H₅)CH₂OCH(OC₂H₅)₂ are described and their reactivities towards xanthine oxidase from Arthrobacter M-4 are determined. Only the 3-methyl derivative of 6-phenyl-4(3H)-pteridinone and its 8-oxide i. e. 6a and 5a are found to be substrates although their reactivities are still very low. Oxidation takes place at C-2 of the pteridinone nucleus. All the 3-alkyl derivatives are less tightly bound to the enzyme than 6-phenyl-4(3H)-pteridinone. Introduction of the N-oxide at N-8 considerably lowers the binding of the substrates. Inhibition studies have revealed that 3-methyl-6-phenyl-4(3H)-pteridinone ( 6a ) is a non-competitive inhibitor with a Ki-value of 47 μM and the 3-ethyl derivative ( 6b ) an uncompetitive one with a Ki-value of 19.6 μM.     

Tin-rich Phases RE2Au3Sn6 with RE = La,Ce, Pr,Nd, Sm – Synthesis,Structure, Magnetic Properties,and 119Sn Mössbauer Spectra

The stannides RE₂Au₃Sn₆ (RE = La, Ce, Pr, Nd, Sm) were synthesized from the elements by arc-melting. Small single crystals were grown by annealing samples in sealed tantalum tubes in an induction furnace with a special annealing sequence. The polycrystalline phases were characterized through their X-ray powder diffraction pattern. The structures of Ce₂Au₃Sn₆, Pr₂Au₃Sn₆, and Nd₂Au₃Sn₆ were refined from single-crystal X-ray diffractometer data. The RE₂Au₃Sn₆ stannides crystallize with the orthorhombic La₂Zn₃Ge₆ type, space group Cmcm. The basic structural building units are Au1@Sn₄ tetrahedra and Au2@Sn₅ square pyramids. These units are condensed to layers and the structure can be described by a simple stacking of tetrahedral and pyramidal layers with the rare earth cations in between. Temperature dependent susceptibility studies indicate that all rare earth atoms are in the trivalent oxidation state, as their effective magnetic moments match the expected values of the free RE³⁺ ions. Pr₂Au₃Sn₆ and Nd₂Au₃Sn₆ exhibit antiferromagnetic ordering at T_N = 6.3(1) and 6.7(1) K. Investigations of the electrical resistivity of La₂Au₃Sn₆ and Ce₂Au₃Sn₆ confirmed that these compounds are metallic, for La₂Au₃Sn₆ a lower resistivity was observed, in line with the absence of screening unpaired electrons. ¹¹⁹Sn Mössbauer spectra for La₂Au₃Sn₆, Ce₂Au₃Sn₆, Pr₂Au₃Sn₆ and Nd₂Au₃Sn₆ show a complex superposition of three sub-spectra which can be differentiated through their distinctly different quadrupole splitting parameters. The isomer shifts (1.87 to 2.22 mm · s^–1) indicate significant s electron density at the tin nuclei.     

Untersuchungen an Selen-Verbindungen. LXIV. Darstellung und Eigenschaften von Säurederivaten von Phenylselen(IV) -Verbindungen (C6Hs) 2SeX2, (C6H5) 3SeX

Studies on Selenium Compounds. LXIV. Preparation and Properties of Acid Derivatives of Phenylselenium(IV) Compounds (C₆H₅) ₂SeX₂ and (C₆H₅) ₃SeX. Reactions of (C₆H₅) ₂SeBr₂ and (C₆H₅) ₃SeCl with silver salts of acids are investigated. From (C₆H₅) ₂SeBr₃ and AgY (Y = N0₃, CH₃CO₃, CF₃CO₂, 1/2 SO₄, CH₃SO₃, NCO) the compounds (C₆H₅) ₂Se(NO₃) ₂ (C₆H₅) ₂Se(CH₃CO₂) ₂, (C₆H_s) ₂Se(CF₃CO₂) ₂, (C₆H₅) ₂SeSO₄, (C₆H₅) ₂Se(CH₃SO₃) ₂ and (C₆H₅) ₂Se(NCO) ₂ are prepared. They are characterized by solubility, molecular weight and conductivity. Reaction of (C₆H₅) ₃SeCl and AgX (X = NO₃, CH₃CO₂) yields (C₆H₅) ₃SeNO₃ and (C₆H₅) ₃SeCH₃CO₂.     

Neue Synthesen und Kristallstrukturen von Bis(fluorphenyl)quecksilber,Hg(Rf)2 (Rf = C6F5, 2, 3, 4, 6‐F4C6H, 2, 3, 5, 6‐F4C6H, 2, 4, 6‐F3C6H2, 2, 6‐F2C6H3)

New Syntheses and Crystal Structures of Bis(fluorophenyl) Mercury, Hg(R_f)₂ (R_f = C₆F₅, 2, 3, 4, 6‐F₄C₆H, 2, 3, 5, 6‐F₄C₆H, 2, 4, 6‐F₃C₆H₂, 2, 6‐F₂C₆H₃) Bis(fluorophenyl) mercury compounds, Hg(R_f)₂ (R_f = C₆F₅, C₆HF₄, C₆H₂F₃, C₆H₃F₂), are prepared in good yields by the reactions of HgF₂ with Me₃SiR_f. The crystal structures of Hg(2, 3, 4, 6‐F₄C₆H)₂ (monoclinic, P2₁/n), Hg(2, 3, 5, 6‐F₄C₆H)₂ (monoclinic, C2/m), Hg(2, 4, 6‐F₃C₆H₂)₂ (monoclinic, P2₁/c) and Hg(2, 6‐F₂C₆H₃)₂ (triclinic, P1) are described.     

Synthesen und Eigenschaften neuer Tris(fluorphenyl)antimon- und -bismut-Verbindungen. Kristallstruktur von Tris(2,6-difluorphenyl)bismut

Syntheses and Properties of Some New Tris(fluorophenyl)antimony and -bismuth Compounds. Crystal Structure of Tris(2,6-difluorophenyl)bismuth (2,6-F₂C₆H₃)₃Bi, (2,4,6-F₃C₆H₂)₃Bi, and (2,6-F₂C₆H₃)₃Sb are prepared via Grignard reactions with BiBr₃ and SbBr₃, respectively. The syntheses and properties of the new compounds and the crystal structure of (2,6-F₂C₆H₃)₃Bi are described. From the reaction of BiBr₃ with Ag(OCOC₆H₃F₂) the bismuth benzoate Bi(OCOC₆H₃F₂)₃ is formed in 83% yield. Attempts to prepare (2,6-F₂C₆H₃)₃Bi by decarboxylation of the bismuth benzoate failed.     

New Synthesis of Triphenylbismuth Diaroxides

The reaction of triphenylbismuth, hydrogen peroxide, and phenol (molar ratio 1 : 1 : 2) in ether was used to synthesize triphenylbismuth diaroxides Ph₃Bi(OAr)₂ [Ar = C₆H₃(NO₂)₂-2,4, C₆H₂(NO₂)₃-2,4,6, C₆H₃Cl₂-2,6, C₆H₂Cl₃-2,4,6, C₆H₃Br₂-2,4, C₆H₂Br₃-2,4,6, C₆H₂Br₂-2,4,Me-6, C₆H₂Br₂-2,6, NO₂-4]. At an equimolar reagent ratio, bridged bismuth compounds (Ph₃BiOAr)₂O are formed. The crystal structure of bis-(2,4-dinitrophenoxy)triphenylbismuth Ph₃Bi[OC₆H₃(NO₂)₂-2,4]₂ was studied by X-ray diffraction to show that the bismuth atom has a distorted trigonal bipyramidal coordination and the 2,4-dinitrophenoxyl ligands are axial. The CBiC and OBiO angles are 109.6(5)°, 122.3(5)°, 128.1(5)°, and 175.6(3)°. The Bi-O^1,6 and Bi-C bond lengths are 2.256(10), 2.242(9) and 2.18(1), 2.18(1), 2.19(1) Å, respectively.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 6, 2005, pp. 927–929.Original Russian Text Copyright © 2005 by Sharutin, Egorova, Tsiplukhina, Molokov, Fukin.     

Darstellung,Eigenschaften und Reaktionsverhalten von 2-(Dimethylaminomethyl)phenyl- und 8-(Dimethylamino)naphthylsubstituierten Lithiumhydridosilylamiden – Bildung von Silaniminen durch Lithiumhydrideliminierung

Preparation, Properties, and Reaction Behaviour of 2-(Dimethylaminomethyl)phenyl- and 8-(Dimethylamino)naphthylsubstituted Lithium Hydridosilylamides – Formation of Silanimines by Elimination of Lithium Hydride The hydridosilylamines Ar(R)Si(H)–NHR′ ( 2 a : Ar = 2-Me₂NCH₂C₆H₄, R = Me, R′ = CMe₃; 2 b : Ar = 2-Me₂NCH₂C₆H₄, R = Ph, R′ = CMe₃; 2 c : Ar = 2-Me₂NCH₂C₆H₄, R = Me, R′ = SiMe₃; 2 d : Ar = 8-Me₂NC₁₀H₆, R = Me, R′ = CMe₃; 2 e : Ar = 8-Me₂NC₁₀H₆, R = Ph, R′ = CMe₃; 2 f : Ar = 8-Me₂NC₁₀H₆, R = Me, R′ = SiMe₃) have been synthesized from the appropriate chlorosilanes Ar(R)SiHCl either by reaction with the stoichiometric amount of Me₃CNHLi ( 2 a , 2 b , 2 d , 2 e ) or by coammonolysis in liquid NH₃ with chlorotrimethylsilane in molar ratio 1 : 3 ( 2 c , 2 f ). Treatment of 2 a–2 f with n-butyllithium in equimolar ratio in n-hexane resulted in the lithiumhydridosilylamides Ar(R)Si(H)–N(Li)R′ 3 a–3 f . The frequencies of the Si–H stretching vibration and ²⁹Si–¹H coupling constants in the amides are smaller than in the analogous amines indicating a higher hydride character for the hydrogen atom of the Si–H group in the amides compared to the amines. Results of NMR spectroscopic studies point to the existence of a (Me₂)N → Si coordination bond in the 8-(dimethylamino)naphthyl-substituted amines and amides. The amides 3 a–3 c are stable under refluxing in m-xylene. At the same conditions 3 d and 3 e eliminate LiH and the silanimines 8-Me₂NC₁₀H₆(R)Si=NCMe₃ ( 4 d : R = Me, 4 e : R = Ph) are formed. The amides 3 a–3 d und 3 f react with chlorotrimethylsilane in THF to give the corresponding N-substitution products Ar(R)Si(H)–N(SiMe₃)R′ 6 a–6 d and 6 f in good yields. 4 d is formed as a byproduct in the reaction of 3 d with chlorotrimethylsilane. In n-hexane and m-xylene these amides are little reactive opposite to chlorotrimethylsilane. 6 a–6 d and 6 f are obtained in very small amounts. In the case of 3 d besides the N-substitution product 6 d the silanimine 4 d is obtained. In contrast to chlorotrimethylsilane the amides 3 a and 3 f react well with chlorodimethylsilane in m-xylene producing 2-Me₂NCH₂C₆H₄(H) SiMe–N(SiHMe₂)CMe₃ ( 7 a ) and 8-Me₂NC₁₀H₆(H)SiMe–N(SiHMe₂)SiMe₃ ( 7 f ).     

Bis(2,6-dimethoxyphenyl) sulfide, selenide and telluride, and their derivatives

2,6-Dimethoxyphenyl derivatives of sulfur, selenium, and tellurium, such as ΦEEΦ, Φ₂E, ΦSeH, [MeΦ₂E]X (X=MeSO₄, ClO₄), Φ₂EO · xH₂O, [Φ₂EOR]ClO₄, [Φ₂EOH]ClO₄ (R=Me, Et), Me₂SnCl₂ · 2Φ₂EO (E=S, Se) [Φ=2,6-(MeO)₂C₆H₃; E=S, Se, Te] have been prepared, and their properties compared with common phenyl derivatives. The reaction rates of Φ₂E with dimethyl sulfate and butyl bromide increased in the order E=S<Se<Te, which were compared with those of Ph₃M and Φ₃M, M=P>As>Sb. These reactivities are parallel with the electrochemical oxidation potentials reported for Ph₂E and with the first ionization potentials reported for Ph₃M. The rate of Φ₂Te was faster than that of Ph₃P and slightly faster than that of Φ₃Sb. From the reactivity of [Φ₂E-Me]⁺ salts with nucleophiles, the E⁺–Me bond strengths were estimated to increase in the order E=Se<S<Te. The reaction rates of Φ₂EO with dimethyl sulfate increased in the order E=S<Se<Te, and the respective rate of Φ₂EO was faster than that of Φ₂E. The origins of these reactivities and bond strengths are discussed.     

Über Glasbildung und Eigenschaften von Chalkogenidsystemen. XIII. Über die Verbindungen Na6Ge2S6 · 4 CH3OH und Na6Ge2Se6 · 4 CH3OH

Glass Formation and Properties of Chalcogenide Systems. XIII. On the Compounds Na₆Ge₂S₆ · 4 CH₃OH and Na₆Ge₂Se₆ · 4 CH₃OH The glasses Ge₂S₃ and Ge₂Se₃ are soluble in solutions of Na₂S or Na₂Se in CH₃OH forming Na₆Ge₂S₆ · 4 CH₃OH and Na₆Ge₂Se₆ · 4 CH₃OH. On heating the CH₃OH-free substances are formed. From the i.r. and Raman spectra can de seen that the structure of the ions Ge₂S, Ge₂Se, P₂S₆^4?, and of Si₂Cl₆ is of the same type. The formation of the compounds can be regarded as a chemical proof for the existence of [Ge₂S₆] and [Ge₂Se₆] units as structural groups in the glasses Ge₂S₃ and Ge₂Se₃.     

Kristallstrukturen von Na3TiCl6 und K3TiCl6

Ternary Halides of the Type A₃MX₆. IX Crystal Structures of Na₃TiCl₆ and K₃TiCl₆ Light yellow single crystals of Na₃TiCl₆ and K₃TiCl₆ are obtained from the binary components, TiCl₃ and NaCl and KCl, respectively, in 1 : 3 molar ratios. Na₃TiCl₆ crystallizes with the cryolite type of structure (monoclinic, P2₁/n, Z = 2, a = 668,02(8), b = 709,13(6), c = 981,38(12) pm, β = 90,31(2)°) while K₃TiCl₆ belongs to the K₃MoCl₆ type of structure (monoclinic, P2₁/c, Z = 4, a = 1261,6(2), b = 751,36(8), c = 1210,7(2) pm, β = 108,30(2)°).     

Cluster self-organization of germanate systems: Suprapolyhedral precursor clusters and self-assembly of K2Nd4Ge4O13(OH)4, K2YbGe4O10(OH), K2Sc2Ge2O7(OH)2, and KScGe2O6(PYR)

Geometric and topological analysis of all known types of K,TR germanates (TR = La-Lu, Y, Sc, In) is carried out with the use of computer techniques (the TOPOS 4.0 program package). Framework structures are represented as three-dimensional (3D) K,TR,Ge networks (graphs) with oxygen atoms removed. The following crystal-forming 2D TR,Ge networks are determined: for K₂Nd₄Ge₄O₁₃(OH)₄, this is TR 4 3 3 4 3 3 + T 4 3 4 3; for K₂YbGe₄O₁₀(OH), this is TR 6 6 3 6 + T 1 6 8 6 + T 2 3 6 8; for K₂Sc₂Ge₂O₇(OH)₂, this is TR 6 4 6 4 + T 6 4 6; and for KScGe₂O₆, TR 6 6 3 6 3 4 + T 1 6 3 6 + T 2 6 4 3. The full 3D reconstruction of the self-assembly mechanism of crystal structures is performed as follows: precursor cluster—primary chain—microlayer-microframework (supraprecursor). In K₂Nd₄Ge₄O₁₃(OH)₄, K₂Sc₂Ge₂O₇(OH)₂, and KScGe₂O₆, an invariant type of cyclic six-polyhedral precursor cluster is identified; this precursor clusters is built of TR octahedra, which are stabilized by atoms K. For K₂Nd₄Ge₄O₁₃(OH)₄, the type of cyclic four-polyhedral precursor cluster of tetrahedron-linked TR octatopes is identified. The cluster coordination number in a layer is six (the maximum possible value) only for anhydrous germanate KScGe₂O₆ (an analogue of pyroxene, PYR); in the other OH-containing germanates, this number is four. The mechanism of formation of Ge radicals in the form of groups Ge₂O₇ and Ge₄O₁₃, a chain GeO₃, and a tubular assembly of linked cyclic groups Ge₈O₂₀ is considered.     

Tieftemperatur-flüssigphasefluorierung von pentafluorphenyl-element-Verbindungen. Darstellungen und eigenschaften von (C6F5)3AsF2, (C6F5)3SbF2, (C6F5)2SeF2, (C6F5)2SeO,C6F5TeF3 und Cs[(C6F5)3EF3] (E = As,Sb) [1]

The fluorination reactions of (C₆F₅)₃E (E = As, Sb) with elemental flourine yield (C₆F₅)₃EF₂ in high yields. From the reactions of (C₆F₅)₃EF₂ with CsF the new salts Cs[(C₆F₅)₃EF₃] are obtained. (C₆F₅)₂SeF₂ and C₆F₅TeF₃ are formed for the first time by reacting (C₆F₅)₂SeF and (C₆F₅)₂TeF₂ with elemental flourine and XeF₂, respectively. (C₆F₅)₂SeF₂ rapidly reacts with glass, and the new compound (C₆F₅)₂SeO is isolated. The preparations, properties and ¹⁹F NMR spectra of the new compounds are described.     

Untersuchungen zu Synthese und Reaktionen von Fluorphenylquecksilber-Derivaten mit den Liganden 2-FC6H4, 2,6-F2C6H3 und 2,4,6-F3C6H2

Investigations on Syntheses and Reactions of Fluorophenylmercury Compounds with the Ligands 2-FC₆H₄, 2,6-F₂C₆H₃, and 2,4,6-F₃C₆H₂ 2,6-F₂C₆H₃HgCl and 2,4,6-F₃C₆H₂HgCl are synthesized via the reactions of the corresponding phenylmagnesium compounds and HgCl₂. 2-FC₆H₄HgCl is selectively obtained only in a reaction involving intermediately formed Cd(2-FC₆H₄)₂. The diphenylmercury derivative Hg(2,4,6-F₃C₆H₂)₂ is obtained while stirring a dichloromethane solution of 2,4,6-F₃C₆H₂HgCl for several days. The direct mercuration of 1,3,5-trifluorobenzene with Hg(OCOCF₃)₂ yields, depending on the stoichiometry, 2,4,6-trifluorophenylmercury trifluoroacetate and 1,3-bis(trifluoroacetatomercuri)-2,4,6-trifluorobenzene which is converted into the corresponding chloromercuri derivative by treatment with hydrochloric acid in CH₃CN. As a product of the reaction of 1,3,5-trifluorobenzene and HgO in CH₃COOH only 2,4,6-trifluorophenylmercury acetate is isolated although spectroscopic evidence has been found for double and triple mercurated derivatives. All compounds are characterized by elemental analyses, nmr and mass spectra. The reaction of Hg(2,4,6-F₃C₆H₂)Cl and Cd(CF₃)₂ · 2 CH₃CN gives Hg(2,4,6-F₃C₆H₂)CF₃ which slowly dismutates in CH₂Cl₂ solution into Hg(2,4,6-F₃C₆H₂)₂ and Hg(CF₃)₂. The ligand exchange of Hg(2,4,6-F₃C₆H₂)₂ and TeCl₄ selectively gives Te(2,4,6-F₃C₆H₂)₂Cl₂ and Hg(2,4,6-F₃C₆H₂)Cl. Transmetalations of Hg(2,4,6-F₃C₆H₂)₂ and gallium or tin give NMR spectroscopic evidence for the new derivates Ga(2,4,6-F₃C₆H₂)₃ and Sn(2,4,6-F₃C₆H₂)₄.     

Hydrogen-bond networks of 1,3-imidazolidine-2-thione: synthesis and structures of complexes of silver(I), copper(I), cadmium(II) and zinc(II)

Solution reactions of silver(I), copper(I), cadmium(II) and zinc(II) salts with 1,3-imidazolidine-2-thione (imdt) under diverse conditions yielded four complexes: [Cd(SC₃H₆N₂)₂(Ac)₂] (1), [Zn(SC₃H₆N₂)₂(Ac)₂] (2), [Cu₂(SC₃H₆N₂)₆]SO₄ (3) and [Ag₂(SC₃H₆N₂)₆]SO₄ (4). Complexes 1 and 2 are 1D and 2D hydrogen-bond aggregations. Complexes 3 and 4 are isostructural 3D hydrogen-bond networks. The diverse coordination modes of imdt and different anions are the major factors for three distinct hydrogen-bond structures.     

The luminescence of Cs2NaSbCl6 AND Cs2NaSbBr6: a transition from a localized to a delocalized excited state

The luminescences of Cs₂NaSbCl₆ and Cs₂NaSbBr₆ are reported. For Cs₂NaSbBr₆ the luminescence properties are described in terms of a band model. For Cs₂NaSbCl₆ the luminescence is interpreted in terms of isolated Sb³⁺ centres, comparable with Cs₂NaMCl₆−Sb³⁺ (M = Sc, Y, La). The radius of the Sb³⁺ ion is larger in the chloro- than in the bromo-elpasolite.