Spectrophotometric Studies of Dithizone and Some Dithizonates. Molecular Extinction Coefficient of Dithizone In Carbon Tetrachloride

Spectrophotometric measurements on solutions of stannic iodide were found to provide evidence for complex formation with aromatic hydrocarbons. Calculations, based on spectra for mixed solutions of benzene and stannic iodide in carbon tetrachloride, yield values of 0.26 for the equilibrium constant (mole fraction), 28 400 1/mole cm for the molar extinction coefficient of the benzene – stannic iodide complex. Kinetic evidence indicates that the order of decreasing complex stabilities is from xylene to toluene to benzene. The formation of stannic iodide – aromatic hydrocarbon complexes provides an explanation for the discrepancy between measured solubilities of stannic iodide in benzene, toluene, and xylene, and the solubilities predicted by the Hildebrand theory of regular solutions.

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Disubstituted hydroxamic acids and the determination of vanadium

Canadian Journal of Chemistry ◽

10.1139/v68-049 ◽

1968 ◽

Vol 46 (2) ◽

pp. 327-330 ◽

Cited By ~ 12

Author(s):

R. M. Cassidy ◽

D. E. Ryan

Keyword(s):

Extinction Coefficient ◽

Metal Chelate ◽

Visible Region ◽

Hydroxamic Acids ◽

Molecular Extinction Coefficient ◽

Sensitivity Increase ◽

Chelate Rings

A number of disubstituted hydroxamic acids were investigated as possible replacements for benzoylphenylhydroxylamine in the determination of vanadium; none is superior. At 378 mμ., p-phenylazobenzoylphenylhydroxylamine shows a marked sensitivity increase but selectivity is poor. In the visible region, there is an increase in molecular extinction coefficient as the reagent π system is extended; how ever, complete coplanarity of the aromatic and metal chelate rings is not possible and the increase is not large enough to be of much practical value.

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Calculation of the molecular extinction coefficient for Hb and HbO2 between 650 and 450 nm

Documenta Ophthalmologica ◽

10.1007/bf00265537 ◽

1974 ◽

Vol 38 (2) ◽

pp. 344-347 ◽

Cited By ~ 4

Keyword(s):

Extinction Coefficient ◽

Molecular Extinction Coefficient

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New values of molecular extinction coefficient and specific rotation for cyanobacterial toxin cylindrospermopsin

Toxicon ◽

10.1016/j.toxicon.2007.11.007 ◽

2008 ◽

Vol 51 (4) ◽

pp. 717-719 ◽

Cited By ~ 14

Author(s):

Tomoharu Sano ◽

Sachiko Kikuchi ◽

Takuya Kubo ◽

Hiroo Takagi ◽

Ken Hosoya ◽

...

Keyword(s):

Extinction Coefficient ◽

Specific Rotation ◽

Cyanobacterial Toxin ◽

Molecular Extinction Coefficient

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Etude comparée des spectres d'absorption dans le proche infrarouge des complexes 1–1 entre l'eau et les bases, en mélanges ternaires'

Canadian Journal of Chemistry ◽

10.1139/v74-148 ◽

1974 ◽

Vol 52 (6) ◽

pp. 915-923 ◽

Cited By ~ 8

Author(s):

André Burneau ◽

Jacques Corset

Keyword(s):

Carbon Tetrachloride ◽

Water Molecule ◽

Extinction Coefficient ◽

Ternary Mixtures ◽

Proton Acceptor ◽

Acceptor Molecule ◽

Vibrational Assignment ◽

Weak Bases ◽

Intense Absorption ◽

Water Base

The spectra of the complexes involving a water molecule and a proton acceptor molecule are obtained by using ternary mixtures water – base – carbon tetrachloride. The vibrational assignment of these spectra is performed through a prior calculation and by examining the shape of the absorptions and their frequencies according to the base. With the complexes HOH … B, it is observed that the bands related to the v(011) combinations, which involve the free OH group, are narrower than v(110) and have always a larger extinction coefficient. In the 7000–7300 cm−1 region, the most intense absorption is the v(101) combination with the weak bases, but the &([a-z]+);(002) overtone with the strong ones.

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Polyethyleneoxide-capped phthalocyanines: limiting phthalocyanine aggregation to dimer formation

Journal of Porphyrins and Phthalocyanines ◽

10.1002/jpp.365 ◽

2001 ◽

Vol 05 (07) ◽

pp. 582-592 ◽

Cited By ~ 91

Author(s):

D. D. DOMINGUEZ ◽

A. W. SNOW ◽

J. S. SHIRK ◽

R. G. S. PONG

Keyword(s):

Absorption Coefficient ◽

Extinction Coefficient ◽

Synthesis And Characterization ◽

Lead Compound ◽

Dimer Formation ◽

Metal Free ◽

Optical Limiter ◽

532 Nm ◽

Molecular Extinction Coefficient

The synthesis and characterization of a soluble metal-free polyethyleneoxide-capped phthalocyanine and the corresponding lead compound are described. This phthalocyanine was designed to allow the formation of dimers but to inhibit formation of higher aggregates. The monomer/dimer equilibrium constant in chloroform solutions is 750 ± 20 l mol -1. No evidence for higher aggregates was found. The molecular extinction coefficient of the metal-free polyethyleneoxide-capped phthalocyanine in chloroform is one of the lowest known (2.5 × 104 l mol -1 cm -1). The lead-substituted material was demonstrated to be a reverse saturable absorber from 532 nm to about 610 nm. It possesses a large nonlinear absorption coefficient in the visible and is a promising optical limiter material.

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DICHLORINE HEXOXIDE

Canadian Journal of Research ◽

10.1139/cjr38b-048 ◽

1938 ◽

Vol 16b (11) ◽

pp. 382-389 ◽

Cited By ~ 2

Author(s):

M. H. Kalina ◽

J. W. T. Spinks

Keyword(s):

Molecular Weight ◽

Carbon Tetrachloride ◽

Quantum Yield ◽

Physical Properties ◽

Extinction Coefficient ◽

Quantitative Estimation ◽

Wave Length ◽

Colorimetric Method ◽

Green Light ◽

Carbon Tetrachloride Solution

Some chemical and physical properties of dichlorine hexoxide are described and attention is drawn to its dangerous property of exploding violently on contact with organic substances.The extinction coefficient of solutions of dichlorine hexoxide in carbon tetrachloride solution for a wave-length of 5460 Å has been measured and found to be 2.4, which is very much less than that of liquid dichlorine hexoxide for the same wave-length. A colorimetric method is described for the quantitative estimation of dichlorine hexoxide in solutions. The molecular weight of dichlorine hexoxide in carbon tetrachloride solution has been redetermined, and it confirms the formula Cl2O6.Solutions of dichlorine hexoxide in carbon tetrachloride are decomposed photochemically by green light. Gaseous chlorine trioxide (ClO3) is decomposed photochemically by λ3650. Its decomposition is photosensitized by chlorine and bromine, the quantum yield in the chlorine sensitized reaction being about 1.

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XXXVI.—The Absorption of Light by Inorganic Salts. No. I.: Aqueous Solutions of Cobalt Salts in the Infra-Red

Proceedings of the Royal Society of Edinburgh ◽

10.1017/s0370164600025335 ◽

1912 ◽

Vol 31 ◽

pp. 521-529 ◽

Cited By ~ 3

Author(s):

R. A. Houstoun

Keyword(s):

Aqueous Solutions ◽

Present Article ◽

Extinction Coefficient ◽

Accurate Determination ◽

Visible Spectrum ◽

Inorganic Salts ◽

Absorption Of Light ◽

Infra Red ◽

Molecular Extinction Coefficient

The present article is intended to be the first of a series on the absorption of light by solutions of inorganic salts of different elements. With a few scattered exceptions all the work hitherto done on the absorption spectra of inorganic salts has been merely qualitative and has been confined to the visible spectrum. Kayser in his Spectroscopie, vol. iii. p. 45, states that in this field there is work for years and for numerous observers. E. C. C. Baly states in his Spectroscopy, p. 407, that not much is known about the absorption of light in inorganic salts. Merely for its own sake, then, an accurate determination of the molecular extinction coefficient for as many salts under as many different conditions of temperature and concentration, and for as many wave-lengths as possible, would be very valuable.

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