SVIBOR - Papers quoted in CC - project code: 1-07-043

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Papers quoted in Current Contents on project 1-07-043


Quoted papers: 8
Other papers: 37
Total: 45


Title: Charecterization of Mn(II) complexes with 2-(2-pyridilmethyleneamino)phenol and their dyeing properties

Authors:
Grabarić, Zorana
Koprivanac, Natalija
Mešinović, Azra
Parac-Osterman, Đurđa
Grabarić, Božidar (14042)
Journal: Journal of the Society of Dyers and Colourists
Volume: 109
Year: 1993
Pages: from 199 to 201
Number of references: 11
Language: engleski
Summary: The complexing of the azomethine dye 2-(2-pyridylmethyleneamino)phenol (PMAP) with Mn(II) in solution has been investigated. The synthesis of an Mn(II)-PMAP complex is described, together with its characerization by UV/VIS (using a self-interfaced computerized system) spectrometry. Dyeing properties of Mn(II)-PMAP complex for wool and nylon 6.6 fabrics have been investigated, together with the possible use of PMAP as a spectrophotometric reagent for sensoring of Mn(II) ion.
Keywords: 2-(2-pyridulmethyleneamino)phenol, manganese(II) complex of, spectrometric investigation, wool dyeing, nylon dyeing

Title: Computerized potentiometric determination of stability constants of metal ion-crown complexes by the method of corresponding solutions

Authors:
Grabarić, Božidar (14042)
Tkalčec, Mihael (49616)
Merzel, Vlado
Filipović, Ivan
Journal: Electroanalysis
ISSN: 1040-0397
Volume: 3
Year: 1991
Pages: from 647 to 653
Number of references: 16
Language: engleski
Summary: By computerized potentiometric method of corresponding solutions it was shown that potassium ion with 18-crown-6 ligand is forming consecutive complexes (ML and sanwich type ML2) which was so far known only for smaller-ring crown ligands. Complexes of sodium and amonium ions with the same ligand are of simple 1:1 stoichiometry. It is outlined that one should be very cautious taking single species model as the only possible one into account because erroneous results and conclusion can in some instances be obtained.
Keywords: computerized potentiometric measurement, mehod of corresponding solutions, potassium ion, sodium ion, amonium ion, 18-crown-6 complexes of, sandwich complexes

Title: Complexing properties of Schiff bases with copper and nickel ions

Authors:
Koprivanac, Natalija
Grabarić, Zorana
Papić, Sanja
Grabarić, Božidar (14042)
Aćamović-Đoković, Gordana
Journal: Monatshefte fur Chemie
ISSN: 0026-9247
Volume: 126
Year: 1995
Pages: from 230 to 34
Number of references: 27
Language: engleski
Summary: The solution properties of 4-(2-pyridylmethylene)-amino-1-phenyl-2,3-dimethyl-5-pyrazolone (PPP) and 4-(2-quinolylmethyleneamino)-1-phenyl-dimethyl-5-pyrazolone (QPP) and their complexes with copper and nickel were investigated. The composition and stability of the complexes have been determined using the spectrophotometric method at 25 +- 1 oC, constant ionic strength (0.5 M adjusted with KNO3) and a volume ratio of methanol/water of 10 and 16 % for PPP and QPP, respectively, due to lower water solubility of QPP. The experimental results have been fitted to the theoretical equations using the computerized iterative method of successive approximations. The influence of pH and addition of anothe benzene ring to the ligand molecule has been studied. The structure of isolated solid metal complexes with QPP were investigated by IR and mass spectrometry. The use of PPP and QPP as analytical reagents for spectrophotometric sensoring of copper and nickel is discussed.
Keywords: 4-(2-pyridylmethylene)-amino-1-phenyl-2,3-dimethyl-5-pyrazolone, 4-(2-quinolylmethylenamino)-1-phenyl-dimethyl-5-pyrazolone, Schiff bases, coper(II) ion, nickel(II) ion, spectrometric investigations

Title: Signals ratio method for resolution enhacement in differential pulse polarography and related techniques

Authors:
Grabarić, Zorana
Grabarić, Božidar (14042)
Esteban, Miquel
Casassas, Enric
Journal: Analytica Chimica Acta
ISSN: 0003-2670
Volume: 312
Year: 1995
Pages: from 27 to 34
Number of references: 24
Language: engleski
Summary: An efficient and simple resolution method based on signals ratio in time domain is proposed for differential pulse polarography (DPP) and related techniques. The ratio pseudo-DPP are obtained dividing the multianalyte DP polarogram with individual DPP of a single analyte. Using the same procedure for DPP recorded for calibration diagrams and for DPP of unknown binarz mixtures, well resolved ratio pseudo-DPP are obtained. The method is applied to the binary system of lead and thallium, having approximately 70 mV of DPP peaks separation showing considerable overlapping depending of the medium used and on concentratio ratio od the two components. The method proposed is able to resolve lead from at least 40-fold excess of thallium, and thallium from at least 20-fold excess of lead at micromolar concentration range with reproducibility better than 5%.
Keywords: differential pulse polarography, resolution of global signals, lead, thallium, signals ratio method

Title: Optode membrane for continuous measurement of silver ions

Authors:
Murković, Ivana (178963)
Oehme, Ines
Mohr, G.J.
Ferber, Tomislav
Wolfbeis, Otto S.
Journal: Mikrochimica Acta
ISSN: 0026-3672
Volume: 11
Year: 1995
Number of references: 27
Language: engleski
Summary: A lipophilic dye is used as a silver-sensitive chromo-ionophore within plasticized PVC membrane. The sensing scheme is based on a cation-exchange mechanism; silver ions from the aqueous phase are extracted into the organic phase and complexed by the acridine dye. As a result of complexation, a proton of the dye molecule is released from the membrane into the aqueous phase, in order to maintain electroneutrality. The protonated form of the dye and the silver complex show different absorbance maxima which are at 680 and 520 nm, respectively. The signal is detected as a change in absorbance at 680 nm. The response is fully reversible and, due to high lipophilicity of the dye, very stable. The measured absorbance response shows a good correlation with theoretically derived model based on an ion-exchange mechanism. Dynamic range, detection limits, selectivity, response time, short-term repeatability, as well as liftime, are presented in details.
Keywords: optical sensor for silver ions, acridine dye, PVC membrane

Title: LED-compatible copper(II)-selective optrode membrane based on lipophilized Zincon

Authors:
Oehme, Ines
Prokes, Borivoj
Murković, Ivana (178963)
Werner, Tobias
Klimant, Ingo
Wolfbeis, Otto S.
Journal: Fresenius' Journal of Analytical Chemistry
ISSN: 0937-0633
Volume: 350
Year: 1994
Pages: from 563 to 567
Number of references: 26
Language: engleski
Summary: An optical single shot test for Cu(II) ions is presented. The membrane consists of a polyester support and an active layer composed of hydrogel, a hydrolytic plasticizer and Zincon. The latter has been made lipophilic bz ion-pairing with tetraoctyl-ammonium bromide. The membrane responds to Cu(II) ions in giving a color change from pink to blue. Because the lazer irreversibly extracts copper from the solution, a kinetic approach has been used for quantitation which consisted in measuring the slope od the absorbace with time after the membrane has been exposed for 2 min to the analzsed solution. A linear calibration graph has been obtained for the 63.5 ppm - 6.35 promil of copper. The complexed form of the dye exhibits an absorbance maximum at 620 nm, which matches with the emission band of the orange LED. Measurements have been performed at pH=6, because no complexation of zinc occurs in this range. The long term stabilitz of the membrane exceeds 6 month when stored drz and in the dark. The strong binding of Cu(II) ions along with the fairly high selectivity of the membrane also suggests its use as a preconcentration phase.
Keywords: optrode for copper quantitation, Zincon

Title: Application of multivariate curve resolution to voltammetric data. Part 1. Study of Zn(II) complexation with some polyelectrolyte

Authors:
Diaz-Cruz, Jose Manuel
Tauler, Roma
Grabarić, Božidar (14042)
Esteban, Miquel
Casassas, Enric
Journal: Journal of Electroanalytical Chemistry
ISSN: 0022-0728
Volume: 393
Year: 1995
Pages: from 7 to 16
Number of references: 35
Language: engleski
Summary: Multivariate curve resolution is applied to the study of Zn(II) complexation with anions of polymethacrylic and polyacrylic acids in aqueous solution containing 0.01 M KNO3. Data matrices obtained by differrent electrochemical techniques (normal pulse polarography, reverse pulse polarography, differential pulse polarography and differential pulse anodic stripping voltammetry) and for different ligand deprotonation degrees have been analysed individually and simultaneously by a procedure which consists of using several chemometrical techniques based on factor analysis: principal component analysis, evolving factor analysis and multivariate curve resolution with alternating least-squares optimization. These techniques were used to investigate the number of species present in the system, their concentration profiles at increasing ligand concentration and their individual voltammograms together with the global (apparent) stability constants and the ratio od diffusion coefficients of the individual species. The comparison of the results obtained by soft (model free) and hard (model postulated a priori) modelling for the system investigated is discussed.
Keywords: voltammetry, zinc complexes, principal component analysis, polyelectrolytes

Title: Monitoring of pyrocatechol indoor air pollution

Authors:
Eškinja, Ivan
Grabarić, Zorana
Grabarić, Božidar (14042)
Journal: Atmospheric Environment
Number: 10
ISSN: 1352-2310
Volume: 29
Year: 1995
Pages: from 1165 to 1170
Number of references: 24
Language: engleski
Summary: Two spectrophotometric and two electrochemical methods for monitoring of pyrocatechol indoor air pollution have been developed. Spectrophotometrically pyrocatechol was monitored by the methods of Fe(III) and iodine, while electrochemically differential pulse voltammetry on carbon paste electrode was used together with chronoamperometrical monitoring in flow injection mode. The efficiency of pyrocatechol collection during sampling was investigated in water and 0.1 M solution of NaOH and 0,1 M solution of HCl. The later solution has showed the best collection efficiency (between 95.5 and 98.5 %). The methods have been tested for pyrocatechol monitoring in the air of working premises where the meteorological charts have been mapped on a paper impregnated with pyrocatechol. It was found that in the air of these premises the concentration of pyrocatechol is 1.8 mg/m3, which is for an order of magnitude below the hygienic standard of permissible exposure.
Keywords: pyrocatechol, sampling, spectrophotometric determination, electrochemical determination, carbon paste electrode, flow injection analysis, differential pulse voltammetry, chronoamperometry


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