scholarly journals The Preparation and Absorption Spectra of the Geometrical Isomers of Carbonatoglycinatodiamminecobalt(III)

1971 ◽  
Vol 44 (9) ◽  
pp. 2424-2427 ◽  
Author(s):  
Shuji Kanazawa ◽  
Muraji Shibata
Keyword(s):  
Absorption Spectra ◽  
Geometrical Isomers

scholarly journals The geometrical isomers of oxalato and malonato-(ethylenediamine-N,N’-di-S,S-2-propionato)-chromate(III) complexes

2005 ◽  
Vol 70 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Verica Glodjovic ◽  
Milan Joksovic ◽  
Srecko Trifunovic
Keyword(s):  
General Formula ◽  
Absorption Spectra ◽  
Malonic Acid ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Geometric Configuration ◽  
Sodium Oxalate ◽  
Geometrical Isomers

Three octahedral chromium(III) complexes of the general formula Na[Cr(S,S-eddp)L].2H2O, where eddp = the tetradentate O-N-N-O-type ligand ethylenediamine-N,N?-di-S,S-2-propionate and L = a bidentate O-O-type ligand, either oxalate or malonate, were prepared. The complexes were synthesized by the reaction of chromium(III) chloride, S,S-eddp and malonic acid or sodium oxalate, at 60?C. The complexes were isolated chromatographically and the geometric configuration of the complexes was proposed on the basis of their infrared and electronic absorption spectra.

The Ultra-violet Absorption Spectra of Geometrical Isomers

1968 ◽  
pp. 174-176
Author(s):  
J.M. WILSON ◽  
R.J. NEWCOMBE ◽  
A.R. DENARO ◽  
R.M.W. RICKETT
Keyword(s):  
Absorption Spectra ◽  
Ultra Violet ◽  
Geometrical Isomers

scholarly journals GEOMETRICAL ISOMERS OF RETINENE

1953 ◽  
Vol 36 (3) ◽  
pp. 415-429 ◽  
Author(s):  
Ruth Hubbard ◽  
Robert I. Gregerman ◽  
George Wald
Keyword(s):  
Absorption Band ◽  
Absorption Spectra ◽  
Present Theory ◽  
Trans Configuration ◽  
Trans Isomers ◽  
Geometrical Isomers ◽  
Main Absorption Band ◽  
Antimony Chloride ◽  
Cis Isomer

Five crystalline retinenes have been isolated, which have every appearance of being cis-trans isomers of one another. They are all-trans retinene; three apparently mono-cis isomers: neoretinenes a and b and isoretinene a; and isoretinene b, an apparently di-cis isomer. The absorption spectra of these substances display the relations expected of cis-trans isomers. The main absorption band is displaced 5.5 to 7 mµ toward shorter wave lengths for each presumptive cis linkage. Some of the presumptive cis isomers also display a cis peak at 255 to 260 mµ. All five substances yield an identical blue product on mixing with antimony chloride. All of them are converted by light to what appears to be an identical mixture of stereoisomers. Heat isomerizes them very slowly; only neoretinene b exhibits large changes on heating at 70°C. for 3 hours. The various isomers have been extensively interconverted by gentle procedures, and all of them have been converted to all-trans retinene. The present theory of cis-trans isomerism in carotenoids predicts the existence of four stable isomers of retinene. Instead we seem to have five—specifically three mono-cis forms where two are expected. There is no doubt that all these substances are closely related isomers of one another. The only point in question is whether they differ in part by something other than cis-trans configuration. One possibility, as yet little supported by evidence, is that isomerization between ß- and α-ionone rings may be involved. If, however, as seems more likely, all these substances are geometrical isomers of one another, some modification is needed in the present theory of configurational relationships in this class of compounds.

scholarly journals Absorption Spectra of Geometrical Isomers of Hexacoordinated Complexes.

1955 ◽  
Vol 9 ◽  
pp. 810-814 ◽  
Author(s):  
Fred Basolo ◽  
C. J. Ballhausen ◽  
Jannik Bjerrum ◽  
Niels Clauson-Kaas
Keyword(s):  
Absorption Spectra ◽  
Geometrical Isomers

Towards chiral 1,2-naphthalocyanines: 2. Synthesis of lutetium bismacrocyclic derivatives

2001 ◽  
Vol 05 (04) ◽  
pp. 423-427 ◽  
Author(s):  
VOLODYA M. NEGRIMOVSKII ◽  
MARCEL BOUVET ◽  
EVGENI A. LUK'YANETS ◽  
JACQUES SIMON
Keyword(s):  
Mass Spectrometry ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Fast Atom Bombardment ◽  
Racemic Mixture ◽  
Optical Absorption Spectra ◽  
Geometrical Isomers ◽  
Fab Mass Spectrometry

Starting from 1,2-naphthalocyanine lutetium acetate (1,2- NcLuOAc ) the unsymmetrical lutetium phthalo(naphthalo)cyanine (1,2- NcLuPc ) has been synthesized and characterized by optical absorption spectra and fast atom bombardment (FAB) mass spectrometry. 1,2-Naphthalocyanine shows several geometrical isomers, both the mixture (noted Nc ∑) and one of them ( Nc Cs ) have been used for forming the corresponding bismacrocycles. As a result the first racemic mixture of a chiral unsubstituted phthalo(naphthalo)cyanine complex has been synthesized and characterized.

Ultraviolet Absorption of Refractory Elements by a Dual Laser Plasma Method

1988 ◽  
Vol 102 ◽  
pp. 243-246
Author(s):  
J.T. Costello ◽  
W.G. Lynam ◽  
P.K. Carroll
Keyword(s):  
Absorption Spectra ◽  
Laser Plasma ◽  
Optical Pulse ◽  
Ionic Species ◽  
Neutral Species ◽  
Plasma Method ◽  
Plasma Technique ◽  
Refractory Elements ◽  
Delay Times ◽  
Dual Laser

AbstractThe dual laser-produced plasma technique for the study of ionic absorption spectra has been developed by the use of two Q-switched ruby lasers to enable independent generation of the absorbing and back-lighting plasmas. Optical pulse handling is used in the coupling cicuits to enable reproducible pulse delays from 250 nsec. to 10 msec, to be achieved. At delay times > 700 nsec. spectra of essentially pure neutral species are observed. The technique is valuable, not only for obtaining the neutral spectra of highly refractory and/or corrosive materials but also for studying behaviour of ionic species as a function of time. Typical spectra are shown in Fig. 1.

XUV Absorption Spectra of Carbon Ions

1988 ◽  
Vol 102 ◽  
pp. 71-73
Author(s):  
E. Jannitti ◽  
P. Nicolosi ◽  
G. Tondello
Keyword(s):  
Absorption Spectra ◽  
Cross Section ◽  
Theoretical Calculations ◽  
Photoionization Cross Section ◽  
Carbon Ions

AbstractThe photoabsorption spectra of the carbon ions have been obtained by using two laser-produced plasmas. The photoionization cross-section of the CV has been absolutely measured and the value at threshold, σ=(4.7±0.5) × 10−19cm2, as well as its behaviour at higher energies agrees quite well with the theoretical calculations.

Surface enhancement of Raman and absorption spectra from cyanine dye D266 adsorbed on ZnO colloids

1996 ◽  
Vol 88 (1) ◽  
pp. 281-290 ◽  
Author(s):  
HAO WEN ◽  
TIANJING HE ◽  
CUNYI XU ◽  
JIAN ZUO ◽  
FAN-CHEN LIU
Keyword(s):  
Absorption Spectra ◽  
Cyanine Dye ◽  
Surface Enhancement ◽  
Zno Colloids
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