Synthesis and Characterization of Binuclear and Trinuclear Cobalt(III) Complexes With Imidazolate Bridges

1986 ◽  
Vol 39 (8) ◽  
pp. 1213 ◽  
Author(s):  
CJ Hawkins ◽  
E Horn ◽  
J Martin ◽  
JAL Palmer ◽  
MR Snow
Keyword(s):  
Crystal Structure ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
The Other ◽  
Synthesis And Characterization ◽  
Ammine Complexes

Two cobalt(III) ammine complexes are described which have an imidazolate ( Im ) ligand bridging cobalt(III) centres . Their electronic absorption spectra, 1H, 13C and 59Co n.m.r . spectra, and electrochemical data are presented. One complex is a bis [ pentaamminecobalt (III)] complex, [(H3N)5Co( Im )Co(NH3)5]5+, and the other has two pentaammineimidazolatocobalt (III) units coordinated in the cis arrangement to tetraamminecobalt (III). The crystal structure of cis - [(NH3)4Co{( Im )Co(NH3)5}2]Cl2(S2O6)2(OH).3.5H2O is reported. The crystals in the form of orange needles are monoclinic: Cc, a 20.18(1), b 17.089(9), c 15.395(7) Ǻ, β 123.76(4)°, Z 4. The structure was refined to R 0.079.

Spectroscopic characterization of C7H3+ and C7H3˙: electronic absorption and fluorescence in 6 K neon matrices

2014 ◽  
Vol 16 (15) ◽  
pp. 7023-7030 ◽  
Author(s):  
Arghya Chakraborty ◽  
Jan Fulara ◽  
Rainer Dietsche ◽  
John P. Maier
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Spectroscopic Characterization ◽  
First Time

Electronic absorption spectra of mass-selected C7H3+ and C7H3˙ isomers in a neon matrix have been identified for the first time.

Complexes moléculaires d'hétérocycles soufrés et oxygénés. Étude spectrophotométrique de bandes de transfert de charge multiples

1982 ◽  
Vol 60 (7) ◽  
pp. 862-871 ◽  
Author(s):  
Jean-Paul Canselier ◽  
Serge Domenech ◽  
Štefan Stankovsky ◽  
Sabine Gautier
Keyword(s):  
Charge Transfer ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Molecular Complexes ◽  
The Other ◽  
Ionization Potentials ◽  
Nonpolar Solvents ◽  
Other Hand ◽  
The One

As with benzenoid donors, the electronic absorption spectra of the molecular complexes of simple or condensed sulfur or oxygen-containing five-membered heterocycles with TCNE (or DDQ) often show two charge-transfer bands. In many cases, the knowledge of the actual frequencies requires a technique of resolution. The results so obtained are correlated with the ionization potentials of donors on the one hand, and the refractivity of nonpolar solvents on the other hand.

Toward understanding tautomeric switching in hydroxynaphthaldehydes: Characterization of electronic absorption spectra

2015 ◽  
Vol 14 (05) ◽  
pp. 1550033 ◽  
Author(s):  
Aeshah El-Amry ◽  
Shaaban A. Elroby ◽  
Oliver Kühn ◽  
Rifaat H. Hilal
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Density Functional ◽  
Electronic Absorption Spectra ◽  
Functional Theory ◽  
Long Wavelength ◽  
Dependent Absorption ◽  
Experimental Findings ◽  
Potential Use

Long-wavelength electronic absorption spectra of 4-hydroxy-1-naphthaldehyde, its dimer complexes, and 4-hydroxy-3-(piperidine-1-ylmethyl)-1-naphthaldehyde are investigated using time-dependent density functional theory with the TPSSh functional within a continuum solvation model. The results are correlated to recent experimental findings on solvent-, pH- and concentration-dependent absorption. It is confirmed that with decreasing wavelength the spectrum is dominated by the deprotonated (360 nm–400 nm), the dimer (340 nm–370 nm) and the monomer (< 280 nm) species. The potential use of hydroxynaphthaldehydes for the design of tautomeric switches is discussed.

Synthesis and characterization of durene-capped porphyrins and the crystal structure of a hemin derivative

1986 ◽  
Vol 64 (1) ◽  
pp. 208-212 ◽  
Author(s):  
Shantha David ◽  
David Dolphin ◽  
Brian R. James ◽  
John B. Paine III ◽  
Tilak P. Wijesekera ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phenyl Group ◽  
The Other ◽  
Synthesis And Characterization ◽  
X Ray ◽  
Hydrophobic Cavity ◽  
Pyramidal Geometry ◽  
Porphyrin Core ◽  
Square Pyramidal Geometry

Sterically hindered porphyrins having a fully hydrophobic cavity have been prepared. The cavity is capped with a 2,3,5,6-tetramethylbenzene moiety containing at the 1,4-positions methylene —(CH2)n— chains (n = 4, 5, 7) bonded at trans pyrrole rings of a porphyrin that is alkylated with methyl or ethyl groups at the other β-pyrrolic positions. The iron(III) chloride derivative of the 4,4-durene-capped base has been obtained as single crystals, and subjected to X-ray structural analysis. The typical high spin, square pyramidal geometry of five-coordinate hemin chlorides is maintained; the porphyrin core is strongly distorted and there is no interaction between the phenyl group of the strap and the iron.

Preparation and Characterization of a Novel Optical Material Based on Zinc-Tetraphenylporphyrin

2012 ◽  
Vol 476-478 ◽  
pp. 1254-1257
Author(s):  
Xiao Kang Li ◽  
Xiao Hui He ◽  
Yi Wang Chen ◽  
Xiao Lin Fan ◽  
Qing Dao Zeng
Keyword(s):  
Single Crystal ◽  
Absorption Spectra ◽  
Blue Light ◽  
Electronic Absorption ◽  
Fluorescence Spectra ◽  
Electronic Absorption Spectra ◽  
Supramolecular Complex ◽  
Optical Material ◽  
X Ray

Supramolecular complex，Zinc-tetraphenylporphyrin, 4,4’-azopyridine, Luminescence. Abstract. A new supramolecular complex(C44H28N4Zn)2•(C10H8N4)•(C7H8)(1) has been prepared by Zinc-tetraphenylporphyrin(ZnTPP) coordinated with 4,4’-azopyridine, which has been characterized by X-ray single-crystal diffraction.The electronic absorption spectra and fluorescence spectra reveal that the complex displays strong blue light and fluorescence, which is a good optical material.

Electronic Absorption Spectra of Benzylchloride Vapor

1969 ◽  
Vol 23 (6) ◽  
pp. 616-617 ◽  
Author(s):  
R. Ammini Amma ◽  
K. P. R. Nair ◽  
D. K. Rai
Keyword(s):  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Ultraviolet Absorption ◽  
The Other ◽  
Electronic Transitions ◽  
Near Ultraviolet ◽  
Two Systems ◽  
Quartz Spectrograph

The near-ultraviolet absorption spectra of benzylchloride vapor have been photographed on a medium quartz spectrograph. Two systems of bands have been observed, one at 37 115 cm−1 and the other at 41 748 cm−1, which correspond to B2 ↓ A1 and A1 ↓ A1 electronic transitions. The observed spectra have been analysed in terms of fundamentals and overtones.

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