Bis(pyrazolylethyl)thioether ligation to zinc and cadmium: structural characterization of [S(CH2CH2pzMe2)2]ZnCl2, [S(CH2CH2pzMe2)2]CdI2 and [S(CH2CH2pzMe2)2]Cd(NO3)2

Structural characterization of [S(CH₂CH₂pz^Me₂)₂]ZnCl₂ by X-ray diffraction demonstrates that the potentially tridentate [NNS] donor ligand S(CH₂CH₂pz^Me₂)₂ does not coordinate via sulfur, but only binds through the pyrazolyl groups. Furthermore, the ligand does not chelate, but preferentially bridges two zinc centers, thereby resulting in a polymeric, helical, structure. In contrast to the zinc system, the thioether functionality does bind to cadmium in related derivatives, [S(CH₂CH₂pz^Me₂)₂]CdI₂ and [S(CH₂CH₂pz^Me₂)₂]Cd(NO₃)₂.     

Interpretation der Schwingungsspektren von (CH3)2SO2, (CH3)2SO(NH) und (CH3)2S(NH)2 unter Verwendung eines Kopplungsstufenverfahrens

Normal Coordinate Analysis of (CH₃)₂SO₂, (CH₃)₂SO(NH), and (CH₃)₂S(NH)₂ using the Method of Stepwise Coupling The qualitative assignment of the vibrational spectra of (CH₃)₂SO₂ ( 1 ), (CH₃)₂SO(NH) ( 2 a ), and (CH₃)₂S(NH)₂ ( 3 a ) and of the C and N deuterated derivatives of 2 a and 3 a is used in a normal coordinate analysis by the method of stepwise coupling. The force constants and the energy distributions are calculated in symmetry coordinates using a generalized valence force field.     

Synthesis of (CH3C(CH2PPh2)3)CoL complexes (L = O2CO,S2CO,O2SO) through metal-assisted CO2, CS2, SO2 oxidation. Crystal structure of (CH3C(CH2PPh2)3)CO(O2SO)

The solution obtained by reduction of [(triphos)CO(μ-Cl)₂Co(triphos)]⁺² (triphos = CH₃C(CH₂PPh₂)₃) with Na/Hg reacts with CO₂, CS₂ and SO₂ to give (triphos)Co(O₂CO), (triphos)Co(S₂CO), and (triphos)Co(O₂SO), respectively. The molecular structure of the last has been established by X-ray difraction.     

Thermal decomposition of di-t-butyl peroxide in the presence of (CH3)2CCH2: Reactions of CH3, (CH3)2ĊCH2CH3, and (CH3)2ĊCH2C(CH3)2CH2CH3 radicals

A study of the reaction initiated by the thermal decomposition of di-t-butyl peroxide (DTBP) in the presence of (CH₃)₂C?CH₂ (B) at 391–444 K has yielded kinetic data on a number of reactions involving CH₃ (M·), (CH₃)₂CCH₂CH₃ (MB·) and (CH₃)₂?CH₂C(CH₃)₂CH₂CH₃ (MBB·) radicals. The cross-combination ratio for M· and MB· radicals, rate constants for the addition to B of M· and MB· radicals relative to those for their recombination reactions, and rate constants for the decomposition of DTBP, have been determined. The values are, respectively, where θ = RT ln 10 and the units are dm^3/2 mol^?1/2 s^?1/2 for k₂/k and k₉/k, s^?1 for k₀, and kJ mol^?1 for E. Various disproportionation-combination ratios involving M·, MB·, and MBB· radicals have been evaluated. The values obtained are: Δ₁(M·, MB·) = 0.79 ± 0.35, Δ₁(MB·, MB·) = 3.0 ± 1.0, Δ₁(MBB·, MB·) = 0.7 ± 0.4, Δ₁(M·, MBB·) = 4.1 ± 1.0, Δ₁(MB·, MBB·) = 6.2 ± 1.4, and Δ₁(MBB·, MBB·) = 3.9 ± 2.3, where Δ₁ refers to H-abstraction from the CH₃ group adjacent to the center of the second radical, yielding a 1-olefin. © 1994 John Wiley & Sons, Inc.     

The relationship between transannular secondary bonding strength and conformation in diphenyldithiophosphinate stibocanes X(CH2CH2S)2SbS2PPh2 (X = O,S)

The two stibocanes 1-oxa-4,6-dithia-5-stibocane diphenyldithiophosphinate O(CH₂CH₂S)₂SbS₂PPh₂ 1 and 1,3,6-trithia-2-stibocane diphenyldithiophosphinate S(CH₂CH₂S)₂ · SbS₂PPh₂ 2 were prepared from the corresponding chloro oxa- and thia-stibocanes 3 and 6 , and the ammonium salt of diphenyldithiophosphinic acid in CH₂Cl₂. 1 and 2 were characterized by IR, EI-MS and multinuclear NMR (¹H, ¹³C, ³¹P{¹H}). The crystalline state of 1 features two Sb1 ? S1 intermolecular interactions [3.987(2) Å] that results in a dimer. Alongside 1 displays both an endocyclic, transannular Sb1 ? O1 interaction [2.555(6) Å] and an exocyclic Sb1 ? S4 secondary interaction [3.327(2) Å]. The coordination geometry at the antimony could be described as AX₄YE ψ-trigonal bipyramid geometry with A = Sb, X = S1, S2, S3,O1; Y = S4; S1, S2 and the lone pair lays on the equatorial plane with O1 and S4 in axial positions. The Sb1 ? S4 secondary bonding is face capping one of the planes form by the lone pair, S2 and S3 of the trigonal bipyramid. 2 also displays both an endocyclic, transannular Sb1 ? S2 interaction [2.949(3) Å] and an exocyclic Sb1 ? S5 secondary interaction [3.216(3) Å]. The antimony becomes five-coordinate, giving the AX₄YE ψ-trigonal bipyramid geometry with S1, S3 and the lone pair laying on the equatorial plane with S2 and S4 in axial positions. The Sb1 ? S5 also here is face capping the plane form by the lone pair, S3 and S4 of the trigonal bipyramid. The conformation of the eight membered ring in 2 is boat-chair. In 1 the main conformation is chair-planar. Die Konformation des Achtringes in 2 ist Wanne-Sessel. In 1 ist die Konformation des Achtringes Sessel-planar.     

Methylenverbrückte Antimon(III)-dithiocarbamate, -xanthogenate und -dithiophosphate: [SbL2]2CH2 (L = S2CNR2, S2COR,S2P(OR)2)

Methylene-bridged Antimony(III)-dithiocarbamates, -xanthogenates, and -dithiophosphates: [SbL₂]₂CH₂(L = S₂CNR₂, S₂COR, S₂P(OR)₂) 1 :4-reaction of [Cl₂Sb]₂CH₂ with sodium dithiocarbamates, -xanthogenates or -dithiophoshates lead to the replacement of the chlorine atoms by the respective 1,1-dithio ligands. The products of the type [SbL₂]₂CH₂ (L = S₂CNR₂, S₂COR, S₂P(OR)₂) are studied by IR, ¹H-NMR- and ¹³C-NMR-spectroscopy. Both spectral data and thermal stability of the compounds are compared with those of the corresponding monomethylstibanes MeSbL₂.     

Dimethylarsenazid (CH3)2AsN3, Dimethylwismutazid (CH3)2BiN3 und Dimethylthalliumzid (CH3)2TiN3

The reaction of (CH₃)₂AsJ and AgN₃ yields (CH₃)₂AsN₃; a colourless liquid (b. p. 136°C) which dissolves as a monomeric in benzene. (CH₃)₂BiN₃ is precipitated in form of colourless needles (dec. temp. 150°C) from an etherical solution of Bi(CH₃)₃ and HN₃. According to its vibrational and mass spectra the molecules are not associated although the (CH₃)₂BiN₃ is not soluble; dipole association of this polar molecules is assumed for the crystal structure. (CH₃)₂TlN₃ can be obtained from TI(CH₃)₃ and ClN₃ as well as from (CH₃)₂TlOH and HN₃ in form of colourless needles and leaves (dec. temp. 245°C). According to its vibrational spectra it has an ionic structure, (CH₃? Tl? CH₃)⁺N^?₃.     

Reactions of S4N4 with diphosphines,Ph2P(X)PPh2 (X = NC4H8N,CH2CH2)

Reactions of S₄N₄ with diphosphines, Ph₂P(X)PPh₂ (X = NC₄H₈N, CH₂CH₂) have resulted in the isolation of N₃S₃? NPPh₂(X)Ph₂PN? S₃N₃ (X = NC₄H₈N, CH₂CH₂), (S)PPh₂(CH₂CH₂)Ph₂PN? S₃N₃, and (S)PPh₂NC₄H₈NPh₂P(S) as new compounds. These heterocycles have been characterized by analytical and spectroscopic (IR, UV-VIS, ¹H and ³¹P-NMR, and MS) techniques.     

Synthesis and spectral studies of diorganotin heterocyclic dithiocarbamate complexes and crystal structures of (2‐F‐Bz)2Sn(Cl) S2CN(CH2CH2)2NEt and (3‐Cl‐Bz)2Sn [S2CN(CH2CH2)2NEt]2 ⋅ 0.5HN(CH2CH2)2NH

Some new diorganotin(IV) complexes of heterocyclic dithiocarbamate having general formula R₂Sn(Cl)S₂CNR'₂ and R₂Sn(S₂CNR'₂)₂ [R = 2‐F‐Bz, 3‐Cl‐Bz; NR'₂ = N(CH₂CH₂)₂NMe, N(CH₂CH₂)₂NEt, and N(CH₂CH₂)₂NBz] have been prepared, respectively. Elemental analyses, IR, and NMR spectral data characterized all compounds. The crystal structures of (2‐F‐Bz)₂Sn(Cl)S₂CN(CH₂CH₂)₂NEt 2 and (3‐Cl‐Bz)₂Sn[S₂CN(CH₂CH₂)₂NEt]₂ ⋅ 0.5 HN(CH₂CH₂)₂NH 5 were determined by single crystal X‐ray diffractometer. In the crystal of complex 2 , the tin atom is rendered five‐coordination in a trigonal bipyramidal configuration by coordinating with S atoms of dithiocarbamate groups. For complex 5 , the central Sn atom exists in a skew‐trapezoidal planar geometry defined by two asymmetrically coordinated dithiocarbamate ligands and two 3‐chlorobenzyl groups. © 2005 Wiley Periodicals, Inc. 16:271–277, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/hc.20096     

Beiträge zur Chemie des Schwefels. 114. Kristall- und Molekülstrukturen vom Hexathiepan (S6CH2), Pentathian (S5CH2) und Dibenzylpentathian (S5C(CH2C6H5)2)

Contributions to the Chemistry of Sulfur. 114. Crystal and Molecular Structures of Hexathiepane (S₆CH₂), Pentathiane (S₅CH₂), and Dibenzylpentathiane (S₅C (CH₂C₆H₅)₂) The crystal and molecular structures of hexathiepane 1 , pentathiane 2 and dibenzylpentathiane 3 were determined by single crystal X-ray structure analyses. 1 : Monoclinic space group P2₁/c; a = 7.694(4), b = 7.668(4), c = 12.367(6) Å, β = 108.9(1)°; Z = 4, d_calc. = 1.986 g/cm₃. The seven-membered heterocycle exists in twist-conformation. 2 : Monoclinic space group C2/c; a = 10.990(5), b = 6.872(4), c = 15.507(6) Å, β = 94.1(1)°; Z = 8, d_calc. = 1.982 g/cm₃. The six-membered heterocycle exists in chair-conformation. 3 : Monoclinic space group P2₁/c; a = 12.907(8), b = 13.611(8), c = 9.408(6) Å, β = 98.9(1)°; Z = 4, d_calc. = 1.442 g/cm₃. 3 is analogous to 2 a six-membered heterocycle with chair-conformation. The benzylic groups are distorted to each other. Bond lengths, bond angles, and dihedral angles of the heterocyclic sulfur rings arc discussed, especially with regard to a comparison with cyclohexasulfur, cycloheptasulfur. and cyclooctasulfur.     

Adduct formation of cadmium(II) N,N-cyclo-hexamethylenedithiocarbamate, [Cd2{S2CN(CH2)6}4], with morpholine: Synthesis, molecular structure, and thermal behavior of a crystalline adduct cis-[Cd{NH(CH2)4O}2{S2CN(CH2)6}2]

The reaction of [Cd₂{S₂CN(CH₂)₆}₄] (I) with morpholine gives a crystalline adduct of cadmium N,N-cyclo-hexamethylenedithiocarbamate [Cd{NH(CH₂)₄O}₂{S₂CN(CH₂)₆}₂] (II), whose coordination sphere includes two molecules of the donor base. The structural organization and thermal behavior of II is studied by X-ray diffraction analysis and simultaneous thermal analysis in comparison with the original binuclear cadmium complex I. The central cadmium atom (coordination number 6) coordinates two morpholine molecules and two structurally equivalent S,S’-anisobidentate ligands HmDtc to form a chromophore [CdN₂S₄] with the structure of a distorted octahedron. The thermal destruction of II proceeds in two stages and includes consecutive steps of dissociation of the Cd-N bonds followed by the desorption of morpholine and thermolysis of the dithiocarbamate moiety of the adduct to form CdS as the final product. The structure of binuclear [Cd₂{S₂CN(CH₂)₆}₄] is refined for a correct refinement of the geometric characteristics of compounds I and II.     

4-Methyl-1,2,3,5-dithiadiazoliumsalze Die Kristallstrukturen von (CH3CN2S2)5[CoCl4]Cl3 und (CH3CN2S2)Cl

4-Methyl-1,2,3,5-dithiadiazolium Salts. Crystal Structures of(CH₃CN₂S₂)₅[CoCl₄]Cl₃ and (CH₃CN₂S₂)Cl 4-Methyl-1,2,3,5-dithiadiazolium tetrachlorocobaltate trichloride, (CH₃CN₂S₂)₅[CoCl₄]Cl₃, was obtained by reaction of trithiazyl chloride, (NSCl)₃, with CoCl₂ in acetonitrile; it forms brown, moisture sensitive crystals. With tetraphenylarsonium chloride in CH₂Cl₂ it yields yellow crystalline (CH₃CN₂S₂)Cl and (AsPh₄)₂CoCl₄. The IR spectra of the title compounds are reported and assigned. Theit crystal structures were determined by X-ray diffraction. Crystal data: (CH₃CN₂S₂)₅[CoCl₄]Cl₃, orthorhombic, P2₁2₁2₁, Z = 4, a = 830, b = 1603, c = 2443 pm at 180 K (structure determination with 1787 observed independent reflexions, R = 0.070); (CH₃CN₂S₂)Cl, triclinic, P2₁2₁2₁, Z = 4, a = 749, b = 819, c = 1015 pm, α = 84.9, β = 67.4, γ = 84.6° at 296 K (2653 reflexions, R = 0.040). Both compounds are ionic, having chloride and distorted tetrahedral CoCl₄^2? anions and planar 4-methyl-1,2,3,5-dithiadiazolium cations which nearly fulfill C_2v symmetry. The (CH₃CN₂S₂)₅[CoCl₄]Cl₃ structure contains five symmetry independent cations, (CH₃CN₂Cl has two symmetry independent cations, all being nearly equal. No nitrogen atom but all sulfur atoms of the cations have contact with three to five chlorine atoms, and as a rule there is one chloride ion which is coplanar with the cation and exhibits rather short distances to both S atoms (288 to 309 pm); therefore, the positive charge of the cations must be concentrated on the sulfur atoms.     

Syntheses,characterizations and crystal structures of two new complexes, [Co2(CH2 =C(CH3)CO2)4(phen)2(H2O)2] and [Pb2(CH2 =C(CH3)CO2)4(phen)2]

Two new complexes, [Co₂(CH₂=C(CH₃)CO₂)₄(phen)₂(H₂O)₂] (1) and [Pb₂(CH₂=C(CH₃)CO₂)₄(phen)₂] (phen = 1,10-phenanthroline) (2), have been synthesized and structurally characterized by single crystal X-ray diffraction methods. There are two cocrystallized conformers of [Co(CH₂=C(CH₃)CO₂)₂(phen)(H₂O)] in the asymmetric unit of 1 with the Co atoms displaying similar coordination modes. In the asymmetric unit of 2, there exist two crystallographically independent [Pb(CH₂=C(CH₃)CO₂)₂(phen)] molecules with the Pb atoms showing completely different coordination geometries. Weak intermolecular interactions such as hydrogen bonding and π–π stacking are responsible for the supramolecular assembly and stabilization of the crystal structures of 1 and 2. The complexes are characterized by elemental analysis, IR spectra, and UV–Vis spectra. The fluorescent properties of 2 are also discussed.     

Kristall- und MolekülStruktur von Tetramethyl(dimethylthiophosphinato)-stiboran (CH3)4SbOP(S) (CH3)2

Crystal and Molecular Structure of Tetramethyl(dimethylthiophosphinato)stiborane (CH₃)₄SbOP (S) (CH₃)₂ (CH₃)₄SbOP(S)(CH₃)₂ crystallizes in the triclinic space-group P1 with a = 7.125, b = 9.297, c = 18.861 Å, α = 77.44°, ß = 83.86°, γ = 79.91° and four formula units per cell. Stibonium is distorted trigonal-bipyramidal and phosphorous distorted tetrahedral surrounded. The mean values of bondlengths are: Sb? C_eq = 2.108, Sb? C_ax = 2.147, Sb? O = 2.641, P? C = 1.819, P? O = 1.514, and P? S = 1.987 Å.     

Computational investigation of the CH3XC=S...S (X = H, HO, HS, PH2, CH3) bonding type

The CH₃XC=S...S (X = H, HO, HS, PH₂, CH₃) bonding types are investigated using the second order Møller-Plesset perturbation approximation with the cc-pVDZ basis set. Electrostatic density potential maps of CH₃XC=S (X = H, HO, HS, PH₂, CH₃) are generated at the MP2/cc-pVDZ level of theory. The interaction energy and topological property are theoretically encompassed for the five complexes. Electrostatic density potential maps of five monomers are generated for the determination of attractive interaction sites. There are different misshaped electron clouds. The red-shifting character is obtained for the CH₃XC=S...S (X = H, HO, HS, PH₂) interaction. For all complexes the S...S bonds are typical closedshell interactions, and the topological properties of the S...S bond fall short of three criteria for the existence of the hydrogen bond. Theoretical values are in very good agreement with the experimental results.     

Über die Darstellung der Dimercapto(methyl)sulfonium-Salze[CH3S(SH)2]+AsF−6 und [CH3S(SH)2]+SbCl−6 und der Bis(chlorthio)Methylsulfonium-Salze [CH3S(SCI)2]+ AsF6−und [CH3S(SCL)2]+SbCl−6

On the Preparation of Dimercapto(methyl)Sulfonium Salts [CH₃S(SH)₂]⁺ AsF₆^? and [CH₃S(SH)₂]⁺SbCl₆^? and the Bis(chlorothio)methylsulfonium Salts [CH₃S(SCI)₂]⁺ AsF₆^? and [CH₃S(SCI)₂]⁺ SbCl₆^? The preparation of the dimercapto(methyl)sulfonium salts [CH₃S(SH)₂]⁺ AsF₆^? and [CH₃S(SH)₂]⁺SbCl₆^? from [CH₃SCl₂]⁺ salts and H₂S at 195 K is reported. The salts are stable below 210 K. They are characterized by additional Raman spektroscopic measurements of the isotopic labelled cations [CH₃S(SD)₂]⁺, [CH₃S(³⁴SH)₂]⁺ and [CH₃S(₃₄SD)₂]⁺. The dimercapto(methyl)sulfonium salts are transfered into bis(chlorthio)methylsulfonium salts by reaction with Cl₂ at 195 K.     

Synthesis and Reaction Chemistry of Sb(ECH2CH2NMe2)3 (E = O,S)

The antimony aminoalkoxide and aminothiolates Sb(ECH₂CH₂NMe₂)₃ [E = O ( 1 ), S ( 2 )] were synthesized and their ability to form adducts with other metal moieties investigated. Compound 1 forms 1:1 adducts with NiI₂ ( 3 ) and M(acac)₂ [M = Cd ( 4 ), Ni ( 5 )], while 2 undergoes ligand exchange with AlMe₃ to afford Me₂AlSCH₂CH₂NMe₂ ( 6 ). The structures of 2 – 4 and 6 were determined. Compound 2 incorporates three S, N‐chelating ligands though the interaction with nitrogen is weaker than in analogous alkoxide complexes. Product 3 reveals one iodine has migrated from nickel to antimony, and all three alkoxide ligands bridge the two metals through μ₂‐O atoms. In contrast, in 4 , only one alkoxide links the antimony and cadmium. Compound 6 adopts the same structure, a chelating S,N ligand generating a tetrahedral center at aluminum, as known tBu₂AlSCH₂CH₂NR₂ species (R = Me, Et).     

Synthesis and spectral characterization of stannocanes of the type [O(CH2CH2S)2SnR2](R=Me1,Bun2,Ph3)

The stannocanes of the type [O(CH₂CH₂S)₂SnR₂](R=Me1,Buⁿ 2,Ph3) have been synthesized in an improved method by the reaction of R₂SnCl₂ with 2, 2′-oxydiethanethiol O(CH₂CH₂SH)₂ in molar ratio of 1:1 at the presence of sodium ethoxide in anhydrous ethanol. The reactions are carried out under inert atmosphere. These compounds have been extensively characterized by FT-IR, UV-Vis spectrophotometry, multi-nuclear (¹H, ¹³C, ¹¹⁹Sn) NMR, elemental analysis and mass spectrometry. The obtained data clearly indicates that, there is a strong interaction between oxygen atom of the ligand as a donor and Sn atom of the organotin species as a Lewis acid acceptor. Therefore, the resulted dithiostannocanes possess a transannular secondary bonding and hypervalency at the central Sn atom which leads to an increase in the coordination number of tin from four to five-coordinated tin.      

Bildung und Eigenschaften von Li2P7R (R = Si(CH3)3, CH3, C(CH3)3)

Formation and Properties of Li₂P₇R (R = Si(CH₃)₃, CH₃, C(CH₃)₃) The reaction of P₇(Sime₃)₃ with Li₃P₇ in the molar ratio of 2:1 yields LiP₇(Sime₃)₂, and in the molar ratio of 1:2 Li₂P₇Sime₃ is formed. Li₂P₇me and Li₂P₇Cme₃ (me = CH₃) are obtained by reaction of white phosphorus with Lime, or LiCme₃, respectively [2]. The compounds Li₂P₇R (R = Sime₃, Cme₃, me) show typical valence tautomerism, as established by ³¹P-n.m.r. spectroscopy at various temperatures. Also LiP(Sime₃)₂ transforms P₇(Sime₃)₃ to yield Li₂P₇Sime₃ but in this reaction considerable cleavage of P? P bonds occurs, too.     

铋(Ⅲ)配合物Bi(1,10-phen)[S2CN(CH3)2]2(NO3),

Three bismuth（Ⅲ） complexes Bi（1,10-phen）[S2CN（CH3）2]2（NO3） （1）, {Bi（S2COCH3）[S2CNC6Hs（CH3）]2}2 （2） and [Bi（S2CNBu2）2（CH3OH）（NO3）]∞ （3） were synthesized and characterized by elemental analysis and IR spectra. Their crystal structures were determined by X-ray single crystal diffraction analysis. Studies show that complex 1 has a monomeric structure with the central bismuth atom eight-coordinated in a capped distorted pentagonal bipyramidal geometry. The complex 2 takes centrosymmetric dimeric structure and the bismuth atoms are seven-coordinated in distorted pentagonal bipyramidal geometry.In complex 3, the bismuth atoms are seven-coordinated in distorted pentagonal bipyramidal geometry by bridging nitrate O atoms and the resulting structure is onedimensional infinite chain polymer.