Mononuclear and binuclear chelates derived from potassium benzenesulfonyldithiocarbazate

Benzenesulfonyldithiocarbazate (PhSO2NHNHCSS−) (HBDC−) complexes of CoII, NiII, ZnII, CdII, PdII, PbII, CuI and AgI have been prepared and characterized by elemental analyses, molar conductivities, spectral (vis., i.r, n.m.r.), thermal (t.g.a., d.t.a.) and magnetic moment measurements. The molar conductivities for the complexes lie in the non-electrolyte range. The i.r. spectral data indicate that KHBDC behaves either as monoanionic bidentate or dianionic tridentate ligand. The O=S=O group participates in bonding via bridge formation in dimeric (1:1) complexes. Different stereochemistries are proposed for the CoII, NiII and PdII complexes on the basis of the spectral and magnetic studies. T.g.a. and d.t.a. data suggest a mechanism for degradation of the complexes as a function of temperature. This revised version was published online in June 2006 with corrections to the Cover Date.     

Thiazolidinone arylhydrazones. Ring cleavage and alkylation of the 5-arylhydrazone derivatives of rhodanine and isorhodanine

The 5-aryihydrazone derivatives of rhodanine and isorhodanine were subjected to the action of hydrazine hydrate to afford the arylhydrazonomercaptomethyltriazolinthione and -triazolinone derivatives 3 and 4 , respectively. Treatment of 1 with benzylamine afforded thioxalic acid dibenzylamide 5 . On the other hand, treatment of 2 with the same reagent afforded the corresponding benzylamino derivatives 6 . Alkylation of 1 and 2 with ethyl bromoacetate and chloroacetamide yielded the corresponding S-alkyl derivatives 7 and 8 , respectively.     

The APCVD of tungsten oxide thin films from reaction of WCl6 with ethanol and results on their gas-sensing properties

The APCVD reaction of WCl₆ with ethanol was examined to deposit tungsten oxide on gas sensor substrates. Deposited films, which were WO_3−x, displayed a different morphology than those seen previously for CVD tungsten oxide. The gas-sensing properties of the deposited films were examined.     

Ligational,thermal, corrosion inhibition and antimicrobial properties of salicylidinebenzenesulphonylhydrazone

Summary Complexes of Cu^II, Co^II, Ni^II, Cd^II, Zn^II and Hg^II with salicylidinebenzenesulphonylhydrazone (HSBS) have been prepared and characterized by elemental analyses, molar conductivities, magnetic moments, spectral (visible, i.r., n.m.r.) and thermal (d.t.a., t.g., d.t.g.) measurements. The magnetic and spectral studies confirm that the Ni^II complex is square, whereas the Co^II complex is tetrahedral. The molar conductivities for the complexes lie in the non-electrolyte range. The corrosion inhibition of aluminium using HSBS was studied by chemical and electrochemical methods. Also, the antimicrobial activities of HSBS and its complexes have been investigated.     

Synthesis and spectra of new 3-carbethoxypyrazole sulfonylurea derivatives

The reaction of 1-benzenesulfonyl-3-ethoxycarbonyl-5-[α-substituted-styryl]pyrazoles (1) with isocyanate and thioisocyanate derivatives yield the corresponding benzenesulfonylurea derivatives ( 2 and 3 ). Bromination of 1 afforded the 4-bromopyrazoles 4 which react with isocyanate derivatives giving 5 that were also obtained by bromination of 2 . Alkaline hydrolysis of the benzensulfonylurea derivatives 2 yield the corresponding pyrazole-3-carboxylic acids 7 .     

Volume expansion and vapour–liquid equilibrium of toluene and ethanol with carbon dioxide at high pressures for the selection of optimum operational condition in the GAS process

High-pressure equilibrium data (vapour–liquid equilibria) were measured for CO₂ + toluene and CO₂ + ethanol systems between 298.15K and 318.15K and pressures up to 7.8 MPa. Based on reported relative volume expansion of solvents, the optimum operational condition for production of fine particles in Gas Anti-Solvent process has been suggested. Moreover, thermodynamic modelling of phase equilibria has been done using Peng-Robinson and Soave-Redlich-Kwong (SRK) equations of state along with van der Waals and Huron Vidal (HV) mixing rules. The results showed that the SRK–HV combination has the best accuracy between studied models and is capable of simulating the binary systems investigated in current research.     

A Review Featuring Fabrication,Properties and Applications of Carbon Nanotubes (CNTs) Reinforced Polymer and Epoxy Nanocomposites

Carbon nanotubes (CNTs) have long been recognized as the stiffest and strongest man-made material known to date.In addition,their high electrical conductivity has roused interest in the areas of electrical appliances and communication related applications.However,due to their miniature size,the excellent properties of these nanostructures can only be exploited if they are homogeneously embedded into light-weight matrices as those offered by a whole series of engineering polymers.In order to enhance their chemical affinity to engineering polymer matrices,chemical modification of the graphitic sidewalls and tips is necessary.The mechanical and electrical properties to date of a whole range of nanocomposites of various carbon nanotube contents are also reviewed in this attempt to facilitate progress in this emerging area.Recently,carbonaceous nano-fillers such as graphene and carbon nanotubes (CNTs) play a promising role due to their better structural and functional properties and broad range of applications in every field.Since CNTs usually form stabilized bundles due to van der Waals interactions,they are extremely difficult to disperse and align in a polymer matrix.The biggest issues in the preparation of CNTs reinforced composites reside in efficient dispersion of CNTs into a polymer matrix,the assessment of the dispersion,and the alignment and control of the CNTs in the matrix.An overview of various CNT functionalization methods is given.In particular,CNT functionalization using click chemistry and the preparation of CNT composites employing hyperbranched polymers are stressed as potential techniques to achieve good CNT dispersion.In addition,discussions on mechanical,thermal,electrical,electrochemical and applications ofpolymer/CNT composites are also included.     

Synthesis and structure determination of a 2D open-framework zincophosphate templated by cyclohexylamine molecules

The synthesis and crystal structure of a new bidimensional zincophosphate (ZnPO) are reported. Zn₂(HPO₄)₂Cl₂·2NC₆H₁₄ crystallizes in the monoclinic space group P2₁/a (n°14) with a = 8.830(3) Å, b = 9.278(3) Å, c = 26.950(9) Å, = 90.74(3)°, V = 2207.7(1) ų and Z = 4. This new material consists of a 2D open-framework of corner sharing ZnO₃Cl and PO₃OH tetrahedra alternating with planes of protonated cyclohexylamine molecules (NC₆H₁₄)⁺. The organic molecules are interconnected to the framework through hydrogen bonds.     

Homogeneous time-resolved FRET assay for the detection of Salmonella typhimurium using aptamer-modified NaYF4:Ce/Tb nanoparticles and a fluorescent DNA label

Microchimica Acta - The authors describe an aptasensor based on time-resolved fluorescence resonance energy transfer (TR-FRET) for the identification of Salmonella typhimurium (S. typhimurium)....     

NMR study of O and N,O‐substituted 8‐quinolinol derivatives

The ¹H and ¹³C NMR spectral study of several biologically active derivatives of 8‐quinolinol have been made through extensive NMR studies including homodecoupling and 2D‐NMR experiments such as COSY‐45°, NOESY, and HeteroCOSY. Electron donating resonance and electron withdrawing inductive effect of several groups showed marked changes in chemical shifts of nuclei at the seventh positions of O‐substituted quinolinols (2–15). Although in N‐alkyl, 8‐alkoxyquinolinium halides (16–21), ring A rightly showed low frequency chemical shift values. Copyright © 2013 John Wiley & Sons, Ltd.