摘要:

AbstractSome newtris(2‐pyridylimine) complexes of iron(II) such as FeL3X2(L = substituted imine ligand, 2‐py‐CR1=NR2, where R1or R2=H, CH3(Me) and C4H5(Ph), X=ClO4−or NCS−, have been synthesized and their electronic structures in the solid state examined by magnetic measurement and57Fe Mössbauer spectroscopic studies. All the perchlorate complexes FeL3(ClO4)2are low‐spin electronic ground state of Fe(II). The dithiocyanato‐complexes, FeL3(NCS)2; the spin states of Fe(II) are dependent on substituent R1and R2. The two complexes Fe(2‐py‐CH=NH)3(NCS)2and Fe(2‐py‐CPh=NH)3(NCS)2are spin‐intermediate (S=1) and Fe(2‐py‐CH=NPh)3(NCS)2shows a thermally inducing spin transition of5T⇄1A1, whereas the other derivatives remain a low‐spin (S=0,1A1) ground state of Fe(II) at three

ISSN:0009-4536    

DOI:10.1002/jccs.198100013

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractStarting from copolymerization of acrylonitrile and divinylbenzene by emulsion polymerization technique, a macroporous, crosslinked polyacrylonitrile copolymer was synthesized. The nitrile groups on the copolymer resin were converted into carboxylic acid groups by hydrolysis with strong alkaline solution of sodium hydroxide to obtain the resin matrix with carboxylic acid groups. A new chelating ion exchange resin containing alkylthioglycolate was prepared by esterification of carboxylic acid groups on the resin matrix and thioglycolic acid with 1,6‐hexanediol as binding part. After studies of the basic characters, ion exchange ability, exchange rate and acidity of the medium, it was found that the new resin obtaind was highly selective for silver(I), mercury(II), gold(III) and bismuth(III) in acidic‐aqueous solution. Separation of these metal ions from each other and concentration of these metal ions from very dilute solution were studied by liquid chromatography using a short column of this new resin. The analytical applications of this new resin are repor

ISSN:0009-4536    

DOI:10.1002/jccs.198100014

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe interaction of diglycollic acid ligand with iron(III), cobalt(II), nickel(II) and copper(II) salts was investigated potentiometrically and spectrophotometrically. Only 1:1 complexes were formed in solution and solid. ThepK's of the ligand and its complexes were computed. The electronic absorption spectra of the complexes depict the octahedral geometry. The infra‐red spectra of the ligand and its complexes were discusse

ISSN:0009-4536    

DOI:10.1002/jccs.198100015

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractIsobutanol in phosphoric acid was detected by gas chromatography with a flame ionization detector. Samples with high content (>100μg/ml) of isobutanol were diluted with an‐pentanol aqueous solution and the diluted solutions were directly injected into the GC column for the determination of isobutanol. For lower content samples, isobutanol was preconcentrated by vacuum distillation or CCl4extraction followed by activated alumina adsorption. In whole GC measurements,n‐pentanol was used as an internal standard.The flame ionization detector is capable of detecting quantities of isobutanol as small as 5×10−8g. With preconcentration, isobutanol at the concentration of 0.4μg/mlor lower can be de

ISSN:0009-4536    

DOI:10.1002/jccs.198100016

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe alcoholic extract ofGymnosporia trilocularisHay. (Celastraceae) was found to exhibit antitumor activities against P388 lymphocytic leukemia and KB cell culture systems. From this extract β‐amyrin (1), β‐sitosterol (2) and its monoglucoside (6), stigmasterol (3) and its monoglucoside (7), campesterol (4) and its monoglucoside (8), maniladiol (5), dulcitol (9) and six yet unidentified principles (10–15) were isolated. The stereochemistry of C‐16‐OH of maniladiol (5) was confirmed spectroscopically by1H nmr to be equatorial. Of all the isolated compounds, the mixture of three steroid monoglucosides (6:7:8=28:1.1:1) exhibited cytotoxicity (ED50=2.6×100mcg/ml) and5showed only marginal effect (ED50=2.1×101mcg/ml) in K

ISSN:0009-4536    

DOI:10.1002/jccs.198100017

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractThe spectral properties ofo‐aminophenol, catechol,o‐nitrophenol, pyrogallol, salicylic acid and gallic acid were investigated in different solvents. The behaviour of hydrogen bonding demonstrated in these systems was discus

ISSN:0009-4536    

DOI:10.1002/jccs.198100018

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

ISSN:0009-4536    

DOI:10.1002/jccs.198100019

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

摘要:

AbstractSome cyclopentadienyl and indenyl niobium(V) phenoxides are reported in this communication. The effect of different types of groups in the phenoxide ring is related with the stability of the compounds. It has been established that only those phenols which have two hydroxyl groups in the ortho position are able to form chelates. The cyclopentadienyl and the indenyl rings are π‐bonded to niobium atom. The complexes have been characterised by elemental analysis and i.r. spect

ISSN:0009-4536    

DOI:10.1002/jccs.198100020

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY

ISSN:0009-4536    

DOI:10.1002/jccs.198100021

出版商:WILEY‐VCH Verlag    

年代:1981

数据来源: WILEY