The reaction of [Ru10C(CO)24][ppn]2 with carbon monoxide to yield [Ru3(CO)12] and [Ru6C(CO)16]2−

The dianion [Ru₁₀C(CO)₂₄]²⁻ in CH₂Cl₂ reacts with CO under ambient conditions to produce quantitative amounts of the species [Ru₃(CO)₁₂] and [Ru₆C(CO)₁₆]²⁻; the hydrido-anion [HRu₁₀C(CO)₂₄]⁻ reacts similarly to form [Ru₆C(CO)₁₆]⁻.     

The unusual electrochemical behaviour of [Co8(CO)18C]2− compared to [M6(CO)15C]2− (M = Co,Rh) and [Fe6(CO)16C]2− carbido clusters

A variety of electrochemical reactions has been observed for the carbido-carbonyl clusters [Co₈(CO)₁₈C](NMe₃CH₂C₆H₅)₂, [Co₆(CO)₁₅C](NMe₃CH₂C₆H₅)₂, [Rh₆(CO)₁₅C](Et₄N)₂ and [Fe₆(CO)₁₆C](Et₄N)₂. The hexanuclear clusters undergo irreversible electrochemical oxidation and reduction steps, whereas the octacobalt species exhibits three electrochemically reversible one-electron steps. The relation between the redox properties and the structure of these clusters is discussed.     

IR STUDIES OF THE THERMAL DECOMPOSITION OF[Rh_6(CO)_(16) Co_4(CO)_(12)]/SiO_2: EVIDENCE FOR THE FORMATION OF RhCo_3(CO)_(12)/SiO_2

IntroductionThepreparativeapproachofaneffectivebilTldslliccatalystisalwaysasubjectofboortantsignificanceinheterogeneouscatalysis.InourrecentstUdies,wefoundthatthebAnetallitcarbonylclustercoCo3(CO)12favorablygivesthebAnetalliccoCo3clusterontheSiOZsubdueaft…     

EPR STUDY OF THE FORMATION OF[Li~+O~-]ION PAIR ON Li-DOPED ZnO

In this letter the study of Li-doped zinc oxide by electronparamagnetic resonance method is described.A signal observed atg_=2.013,g_=1.955 on the degassed sample at 923K was designated toF_s~+ centers(surface oxygen ion vacancies with a single trappedelectron).When the sample was quenched from 1003K into liquid oxygenat 77K under 24 KPa O_2,[Li~+O~-] ion pairs valued at g_=2.026 andg=2.003 with superhyperfine constant a=2.0G,which resulted from ~7Linucleus,formed at Li~+-substitutional site in ZnO lattice.A probablemechanism of [Li~+O~-]ion pair formation was proposed.     

A NUMERICAL STUDY ON THE MECHANISM OF BLOCKING HIGH FORMATION

Numerical integration is performed of the KDV equation of the forced dissipation with the result that it takes about 10 days to transform a high-index circulation into a blocking pattern, in whose establishment and maintenance the thermal forcing and dissipation, nonlinoear advection, and linear dispersion are equally important and serve as three factors of essentiality.     

THERMAL DECOMPOSITION OF THE[Fe_6C(CO)_(16)]~(2-) ON ALUMINA AND MODIFIED ALUMINA

Thermal decomposition of the supported carbido cluster was investi-gated by in situ FT-IR spectroscopy in a temperature range of 25-300℃. Thesupported clusters on alumina and modified alumina with Me_4NBr or PPNClshow quite different decomposition ways in vacuo and under various atmo-spheres, such as H_2, CO, N_2 and CO + H_2. The different decomposition waysprobably lead to the different metal sites of the final catalyst.     

STEREOSPECIFIC FORMATION OF A 1,2λ3 -AZAPHOSPETANE IN THE THERMOLYSIS OF BIS[BIS(DIISOPROPYLAMINO)PHOSPHANYL] DIAZOMETHANE

Abstract

Heating of bis[bis(diisopropylamino)phosphanyl]diazomethane 7. in refluxing benzene for 48 hours, quantitatively led to the corresponding 1.2λ³-azaphosphetane 9 as only one diastereoisomer. This result is explained in terms of carbene insertion into a methin-CH bond of an isopropyl substituent. The regiospecificity and the stereospecificity of the ring closure is discussed. Treatment of 9 with elemental sulfur afforded the corresponding 1.2.2λ³-azathiophosphetane 10 which has been characterized b X ray crystallo raphy: C₂₅H₅₆N₄P₂S₂, space group P2(l)/n, a = 13.628 (3) Å, 6 = 19.369 (5) Å, c 112.485 (4) Å, V = 3073 (3) ų.     

STUDY ON THE REACTION PERFORMANCE OF CLUSTER COMPOUND——A REACTION OF Cu(+2) CAPTURING LIGANDS FROM MOLYBDENUM CLUSTER AND THE CRYSTAL STRUCTURE OF ITS PRODUCT Cu_8Cl_2[S_2P(OEt)_2]_6

The oxidation-reduction reaction of the molybdenum cluster compound Mo_3(μ_3-S)(μ-S)_2-[μ-SOP(OEt)_2] [S_2P(OEt)_2]_3(O)_2 with CuCl_2·2H_2O has been investigated and the chemical components of its product, Cu_8Cl_2[S_2P(OEt)_2]_6, were confirmed. The crystal belongs to the triclinic system and the space group is P with the following unit cell parameters: a=11.578 (5), b=12.663 (3), c=14.317 (4); α=55.54 (2)°, β=57.35 (3)°, γ=72.23 (3)°; Z=1; D_(calc)=1.926 g·cm~(-3). Final discrepancy factor of R is 0.075 for 3573 unique reflections with I≥3σ(I). The results of investigation show that the crystal structure consists of molecular chains with Cu_8Cl_2[S_2P(OEt)_2]_6 as structural unit, in which eight Cu atoms form a cube-shaped cage. The coordination sphere of each Cu atom is a tetrahedron configuration. The distances between Cu atoms are 3.018-3.437, which indicates that there are no metal-metal bonds between Cu atoms. It is worthwhile to study further the phenomenon how Cu(+2) captures the     

STUDY OF THE CORRELATION BETWEEN THE STRUCTURE OF THE [Ir(сod)Cp] COMPLEX AND ITS THERMAL PROPERTIES

Journal of Structural Chemistry - A volatile iridium(I) complex [Ir(cod)Cp] (cod - 1,5-cyclooctadiene, Cp - cyclopentadienyl) is synthesized and characterized by IR and NMR spectroscopy. The...     

STUDY ON THE TREATMENT AND REUSE OF WASTEWATER FROM THE PRODUCTION OF 2—NAPHTHANOL

Systematic studies on the treatment and reuse of the acid industrial watewater containing sodium 2-Naphthylsulfonate(β-salt)from 2-Naphthanol production process by ND-910 resin (made by self) is reported in this paper.Under the operation conditions of initial β-salt concentration of 10000-25000mg/L and initial CODCr of 20000-40000mg/L,the removal rates of Sodium 2-Naphthylsulfonate and CODCr are over 95% and over 89%,respectively.The effluent can be discharged directly after biological degradation.The working sorption capacity of ND-910 Resin for β-salt is over 230g/kg.An alkali-water wash procedure isutilized to regenerate resin and the reclaiming rate of β-salt is over 98%.     

THE STUDY OF THE REACTION OF THE QUASI-AROMATIC COMPLEX [Ni(PnAO)-6H]~(?)WITH FORMALDEHYDE: KINETICS AND MECHANISM

The kinetics of the reaction of [Ni(PnAO)—6H]° with formaldehyde was studied in H_2O—CH_3OH solution under neutral condition and a complicated mechanism with three steps including competitive, consecutive and reverse reactions was proposed.     

The first decaruthenium hydrido cluster: synthesis and crystal structure of [N(PPh3)2]2[Ru10C(CO)24]·C6H14 and [N(PPh3)2][HRu10C(CO)24]

X-ray structural studies of new thermolysis products from the reaction of Ru₃(CO)₁₂ in heptane in the presence of 1,3,5-trimethylbenzene (mesitylene) confirm that they are the decaruthenium carbido-cluster dianion [Ru₁₀C(CO)₂₄]²⁻ (I) and the hydrido decaruthenium carbido-cluster monoanion [HRu₁₀C(CO)₂₄]⁻ (II). Both anions have the giant tetrahedron Ru₁₀ metal framework, and the monohydride provides the first example of a hydrido ligand in a tetrahedral Ru₄ cavity.     

A diruthenium soft ferromagnet showing T(c) = 3.0 K: Mn4(H2O)16H[Ru2(CO3)4]2[Ru2(CO3)4(H2O)2]·11H2O

A three-dimensional CO(3)(2-)-bridged Mn(II)-Ru(2)(II,III) complex, Mn(4)(H(2)O)(16)H[Ru(2)(CO(3))(4)](2)[Ru(2)(CO(3))(4)(H(2)O)(2)]·11H(2)O (1), was synthesized by self-assembling Ru(2)(CO(3))(4)(3-) paddle-wheel precursors and Mn(2+) cations. It contains an unprecedented layer [Ru(2)(CO(3))(4)](n)(3n-) with (4,4) network. The ferromagnetic coupling between spin centers results in ordering below 3.0 K.     

A MACROKINETIC STUDY OF THE METHANATION OF CO_2 OVER CATALYST CJ_(106)

The macrokinetics of the methanation of CO_2 over the new type catalyst CJ_(105)developed inour laboratory has been investigated and compared with the imported catalyst C_(13-4)using a sradientlessinternal circulated reactor at ordinary pressure.The experimental data were processed by a computerand gave two macrokinetic equations for both catalysts as follows:for CJ_(105)and for C_(13-4)     

HYDROGEN DISPLACEMENT OF CHEMISORBED CO FROM THE Ni(100) SURFACE

We report the first observation of hydrogen induced displacement of chemisorbed CO from the Ni(100) surface. This displacement is unexpected since the heat of adsorption for CO is 126 kJ/mole, about 30 kJ/mole larger than the 96 kJ/mole heat of adsorption for hydrogen, Rates of displacement were measured by Fluorescence Yield Near Edge Spectroscopy (FYNES) and Temperature Programmed Desorption (TPD). Excellent agreement is observed between both methods. Hydrogen pressures in the 10~(-4) to 10~(-1) Torr range cause displacement of chemisorbed CO in the 270 to 330 K temperature range in a matter of minutes. The displacement reaction is clearly positive order in CO coverage. The CO coverage data suggested two first order reaction regions with a decrease in rate with decreasing coverage. Displacement is about half order in hydrogen pressure. The activation energy for the high coverage displacement rate is approximately 29±4 kJ/mole while the activation energy for the low coverage displacement rate about 46     

THE MECHANISM OF COPOLYMERIZATION OF VINYL AND DIVINYL MONOMER Ⅵ: A STUDY ON THE MECHANISM OF THE STRUCTURE FORMATION OF CROSSLINKED POLYSTYRENE

In order to study the mechanism of the formation of maeroporous copolymer, the overall reaction kinetics, phase separation and gelation of the S/EGDM in the presence of inert solvents and the physical properties of the eopolymer were investigated and compared with the corresponding system of S/DVB and S/DVB/MMA. The formation of the network structure of the macroreticular polymer was studied and a model of the mechanism suggested.     

CONTROL OF THE COORDINATION MODE OF NO2 − BY THE NATURE OF THE AMINE LIGAND. CRYSTAL STRUCTURE OF THE NEUTRAL ZIGZAG POLYMERIC COMPOUND [mer-Ni(N-(2-Aminoethyl)-1,3-Propanediamine)-(NO2)2] (I)

Abstract

A polymeric zigzag complex, [mer-Ni(N-(2-aminoethyl)-l,3-propanediamine)(NO₂)₂] (I), containing a bridging u-nitro(N,0), was obtained and its crystal structure was determined. Magnetic studies show the compound is antiferromagnetic. These results contrast to those for [Ni(3,3′-diamino-N-methyldipropylamine)(NO₂)₂] (II), which is a monomer.     

STUDY ON THE BLOOD FAT REGULATION OF THE FUCOIDA-GALACTOSAN SULFATE (FGS) FROM LAMINARIA JAPONICA

1. INTRODUCTION Blood fat primarily contains cholesterol, cholesterol ester, phosphatide, triglyceride and free fatty acid in serum of human being and mammalian. Under physiological conditions, the lipids transport in the form of lipoproteins linked with the proteins. Except for the free fatty acid linked with albumin, the other lipids are linked with the globular proteins into high-density lipoproteins (HDL), low density lipoproteins (LDL), very low density lipoproteins (VLDL) and so…     

A STUDY OF THE REDOX CHARACTERISTICS OF THE TERNARY CLATHRATE COMPOUND {MolS2CN(C2H5)2]4} {FeCl4}-{C6H5CH2SSCH2C6H5}

The redox characteristics of the ternary clathrate compound{C6H5CH2SSCH2C6H5}was studied by electrochemical measurement and quantum-chemical calculations.The cyclic voltammogram of this ternary clathrate compound in 0.1M KC1O4-DMF with a platinum electride had 2.pairs of redox peak.Both the electrochemical parameters derived from the voltammogram and the results of EHMO calculations indicate that the pair of redox peak at relatively positive potentials corresponds to the redox reaction of "Fe(Ⅲ)/Fe(Ⅱ) which is irreversible in nature,while the pair of redox peak at more negative potentials corresponds to the redox reaction of Mo(Ⅴ)/ Mo(Ⅱ) which is semi-reversible.The calculations from experiment measurements are fairly agreement with the theoretical calculations.