2,945 research outputs found
Polarographic Study of Some Nitrosonaphthols at d.m.e. in Aqueous Solutions & Water-Ethanol Mixtures of Varying pH
19-2
Polarographic Study of Some Nitrosonaphthols at d.m.e. in Aqueous Solutions & Water-Ethanol Mixtures of Varying pH
19-2
Spectral studies of some hydroxy-derivatives of anthraquinones
The u.v., visible, and i.r. spectra of several hydroxy-anthraquinones are discussed and the bands are assigned. These bands are compared with those of anthracene and anthraquinone. The band at 207 nm. is assigned to a n-sigma* transition; the bands at 252, 272, and 326 nm. are assigned by measuring spectra in solvents of various polarities. The stability constant for the 12-dihydroxyanthraquinone-ethanol complex is obtained
Donor-Acceptor Complexes of N-Substituted Anilines with Aromatic Nitro Compounds Preparation & Infrared Spectroscopic Investigation
615-61
Ultraviolet and Infrared Spectra of Some p-Nitrobenzyl Phenyl Ethers
The UV-spectra of substituted p-nitrobenzyl phenyl ethers in
ethanol and carbon tetrachloride were recorded. The effect of
substitution on band position and intensity is correlated with the
electronic nature of the group. The IR-spectra are analysed and the
position of certain bands ii;; dis.cussed in terms of molecular structure
Synthesis and spectral studies of 5-[3-(1,2,4-triazolyl-azo]-2,4-dihydroxybenzaldehyde(TA)and its Schiff bases with 1,3-diaminopropane(TAAP)and 1,6-diaminohexane(TAAH).Their analytical application for spectrophotometric microdetermination of cobalt(II).
Cataloged from PDF version of article.The new azo compound 5-[3-(1,2,4-triazolyl-azo]-2,4-dihydroxy-benzaldehyde (TA) and its Schiff bases with 1,3-diaminopropane
(TAAP) and 1,6-diaminohexane (TAAH) have been synthesized. The bands of diagnostic importance in the IR and the main signals
in 1
H NMR spectra are assigned. The electronic absorption spectra in pure organic solvents of different polarity and in buffer
solutions of varying pH are investigated. The quantitative description of the solvent effect on the electronic absorption spectra is
studied and their acid ionization constants are determined. Also, a new simple and sensitive method for the spectrophotometric
microdetermination of Co(II) using these compounds (TA, TAAP and TAAH) as new chromogenic reagents is established. The
developed method is successfully used for the determination of trace amounts of cobalt in authentic samples and calculation of the
distribution ratio of cobalt adsorbed on bentonite and kaolinite clay minerals.
2004 Elsevier Ltd. All rights reserved
Uptake of divalent metal ions (Cu2+, Zn2+, and Cd2+) by polysiloxane immobilized diamine ligand system
Porous solid siloxane polymers carrying diamine functional group of formula P–(CH2)3NH–CH2CH2NH2 (where P–represents a silica-like siloxane framework) have been prepared by replacement of the iodine in iodopolysiloxane with ethylenediamine. The iodofunctionalized polysiloxane was prepared by polycondensation of Si(OEt)4 and (MeO)3Si(CH2)I. The polysiloxane diamine ligand system exhibits high potential for preconcentration of divalent metal ions (Cu2+, Zn2+, and Cd2+). The tendency to chemisorb these divalent metal ions by the diamine ligand system at the optimum conditions was found in the order: Cu2+ > Zn2+ > Cd2+. Diamine ligand system suffers from leaching of ligand containing groups upon treatment with acidic solutions
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