摘要:

AbstractA study has been made of the effect of additives to the fuel of a turbulent diffusion flame on the formation of soot and polycyclic aromatic hydrocarbons (PAHs). Fuels containing a polystyrene thickener doped with benzene proved to have many advantages over unthickened fuels. Most significant were an increase in the burning time and the flash point. Nevertheless, polystyrene and benzene additives to a considerable extent increased the formation of soot and PAHs. The analysis of PAHs in this study was made by capillary gas chromatography (GC) and capillary gas chromatography/mass spectrometry (GC/MS). A total of 42 individual compounds were characterized by their retention indices and mass spectra.

ISSN:0009-4536    

DOI:10.1002/jccs.198800001

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThis paper presents a trisolvent ultrasonic extraction and HPLC analysis method for the determination of 11 polycyclic aromatic hydrocarbons in air particulate collected on an air filter by a commercial high volume air sampler. A reverse phase column, Vydac 201 TP, and a gradient mobile phase, acetonitrile/water, were used. The 11 PAHs, fluoranthene, pyrene, benz[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenz[a, h]anthracene, benzo[ghi]perylene, indeno[1,2,3‐cd]pyrene, and coronene were completely resolved under experimental conditions. All the PAHs except coronene were monitored by fluorescence with λex=270nm, λem>389nm. Coronene was monitored by UV with λ=300nm. The methodology was evaluated by spiking SRM 1649 with a PAH standard and then going through different extraction procedures and analyzing the PAH concentrations without clean‐up. An external standard method was used for quantitation. The recovery yields for fluoranthene, benz[a]anthracene, benzo[a]pyrene, benzo[ghi]perylene and indeno[l,2,3‐cd]pyrene were above 90%. The detection limits of PAH with fluorescence at λex=270nm, λem>389nmranged from 5.7p

ISSN:0009-4536    

DOI:10.1002/jccs.198800002

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractHomo Cu(II) and Co(II) binuclear complexes H[MLClMCl2] formed by using the donor properties of thecistwo oxygen atoms of the tridentateN‐(2‐carboxyphenyl)‐salicylaldimine Schiff base derived from salicylaldehyde and anthranilic acid have been synthesized. It was found that the Cu(II) “complexed ligand” readily reacts with CoCl2to form mononuclear Co(II) and binuclear oxygen bridged Co(II) complex [Co2‐L2](H2O)2. The structure of the so prepared complexes was investigated using microchemical analysis, molar conductance measurements as well as electronic and vibrational spectral studies. It was concluded that in the Cu(II) binuclear complex, the Cu(II) ion inside the “complexed ligand” has a planar structure while the other Cu(II) ion is distorted away from planarity. In the Co(II) binuclear complex, the Co atom of the “complexed ligand” is distorted from tetrahedral structure when it coordinates to

ISSN:0009-4536    

DOI:10.1002/jccs.198800003

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe preparation and characterization of a series of new coordination compounds of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) containingo‐methyl‐ oro‐chlorobenzoyl‐4‐phenyl‐3‐thiosemicarbazide (HMBPT, HCBPT=HL) are reported. The reaction products were investigated by analyses, electrolytic conductance, magnetic susceptibility, reflectance and IR spectral studies. The IR spectra show that HMBPT and HCBPT coordinate with the metal ions via different coordination sites (NS and/or NO). The spectral data support the suggestion that the ligands form his‐chelates with Ni(II) and Cu(II) of square planar stereochemistry and of general formulae ML2·H2O, where L is the uninegatively charged bidentate ligand. The Co(II) ion forms octahedral and tetrahedral structures with HMBPT and HCBPT, respectively. The ligand field parameters (D4,Band β) for the Co(II) chelates were calculated using the averaged‐ligand‐field approximation. The influence of the benzene ring substituents (o‐chloro oro‐methyl) on the stereochemistry are discussed. Also, the formation of the complexes in solution was test

ISSN:0009-4536    

DOI:10.1002/jccs.198800004

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe Tridentate chelating, system present in Salicylidineo‐amino benzoic acid was used for complexation with Cu (11), Ni (11), Co (11) and Pd (11). The thin‐layer chromatographic (TLC) detection and separation of these complexes on Silica gel (G) layers was studied. The coloured spots of the complexes were quite visible without any visualizing agent. A maximum of four complexes could be resolved and identified. The coloured zones were eluted with solvent and characterise by elemental analysis and spectral studies. Colour of the complexes at λmaxwas meas

ISSN:0009-4536    

DOI:10.1002/jccs.198800005

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe UV and visible spectra of six model compounds were studied. These compounds can be considered as models of polyaniline in the reduced, cation radical, partially oxidized and oxidized forms. After treatment of a mixture of equal molar quantities of the reduced form (DPPD) and the oxidized form (QDIM) with acid, the following reaction was observed:DPPD(I)+QDIM(III)+2H+=2DPPD+(II)After similar treatment of the partially oxidized form (V) with acid, the radical cation salt formed.The UV and visible spectra of polyaniline in the reduced form, oxidized form and conductive form are similar to the spectra of DPPD,QDIM and DPPD+or radical cation salt of V respectively. We propose that the polyaniline synthesized by chemical oxidation of aniline consists of oxidized and reduced repeat units. Upon protonation a redox reaction (or electron rearrangement) occurs and forms delocalized radical cations (polarons) in the polymer chain which are highly conductive.

ISSN:0009-4536    

DOI:10.1002/jccs.198800006

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe polarographic behaviour of bromate ions in buffered and unbuffered solutions has been studied in the absence and presence of cationic, anionic and nonionic surfactants. The mechanism for the reduction in acid media is discussed. The adsorption effects of electrochemically inactive surfactants on the polarographic waves of BrO3−has been investigated. The values of the kinetic parameters for the electrode reaction at differentpH values have been compute

ISSN:0009-4536    

DOI:10.1002/jccs.198800007

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractNew asymmetrical dimethine cyanines (Va–f) and their bases (VIa,b), incorporating pyrazolo(3,4‐d)‐8‐amino‐1‐azaquinoxaline moiety or its ethiodide, have been prepared and tested for their antibacterial and fungicidal

ISSN:0009-4536    

DOI:10.1002/jccs.198800008

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractA novel series of 1,3,5‐trisubstituted pyrazoles was synthesized. Thus, ethyl 2,4‐dioxo‐6‐phenylhex‐5‐enoate (I) was condensed with phenylhydrazine to afford 3‐ethoxycarbonyl‐1‐phenyl‐5‐styrylpyrazole (II) which on fusion with hydrazine hydrate gave the corresponding acid hydrazide (III). Reaction of III with the appropriate isothiocyanate yielded the disubstituted thiosemicarbazides (IVa‐e) which were cyclized into thiotriazoles (Va‐e), thiadiazoles (Vla‐e) and oxadiazoles (VIIa‐). The structure of the newly synthesized compounds was elucidated by elemental a

ISSN:0009-4536    

DOI:10.1002/jccs.198800009

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractCyclization were occurred via the coupling reactions of some mercuric chloride derivatives of sydnone with LiPdCl3‐CuCl2.A unique six‐membered ring, 3,3′‐ethylene‐4,4′‐bissydnone, was obtained by the cyclization reation of 1,2‐di[3‐(4‐chloromercuric)sydnonyl]ethane. However, the seven‐membered 3,3′‐trimethylene‐4,4′‐bissydnone and 1,3‐di[3‐(4‐chloro)sydnonyl]‐propane were obtained from the corresponding mercuric chlroide of sydnone. Onyl substitution reaction took place when 4,4′‐di[3‐(4‐chloromercuric)sydnonyl]biphenyl, 4,4′‐di[3‐(4‐chloromercuric)sydnonyl]benzene, di(p‐[3‐(4‐chloromercuric)sydnonyl]‐phenyl}methane and, di(p‐[3‐(4‐chl

ISSN:0009-4536    

DOI:10.1002/jccs.198800010

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY