Effect of ester side chains and solvent polarity on the electronic spectra and coordination chemistry of aquacyanocobyrinic acid heptamethylester

1998 ◽  
Vol 69 (4) ◽  
pp. 269-274 ◽  
Author(s):  
M.S.A Hamza
Keyword(s):  
Coordination Chemistry ◽  
Electronic Spectra ◽  
Solvent Polarity ◽  
Side Chains

scholarly journals Synthesis and Characterization of Some Complexes of Azo-Chalcone Ligand and Assessment of their Biological Activity

2021 ◽  
Vol 58 (3) ◽  
pp. 23-31
Author(s):  
Hasan Shamran Mohammed
Keyword(s):  
Electronic Spectra ◽  
Spectral Properties ◽  
Ph Sensor ◽  
Solvent Polarity ◽  
Conductivity Measurements ◽  
H Nmr ◽  
Antibacterial And Antifungal Activities ◽  
Antibacterial And Antifungal ◽  
Solid Complexes

The azo-chalcone dye of theophylline namely (E)-1-(4-((E)-(theophyllin-8-yl) diazenyl)phenyl-3-(4-dimethylaminophenyl)prop-2-en-1-one (TDPP) has been prepared and characterized by H-NMR, infrared, and electronic spectra, elemental analysis. Three solid complexes Mn(II), Ni(II) and Cu(II) of TDPP dye have been prepared and characterized by IR, electronic spectra, magnetic and conductivity measurements. The antibacterial and antifungal activities of the TDPP ligand and metal (II) complexes of Ni, and Cu are notable, with the copper(II) complex being more potent than the others. The TDPP ligand has interesting spectral properties as a pH sensor, solvent polarity sensor, and switches.

Photoreduction of methylviologen sensitized by amphiphilic phthalocyanatozinc(II) complexes

2000 ◽  
Vol 04 (01) ◽  
pp. 123-128 ◽  
Author(s):  
MUTSUMI KIMURA ◽  
YUJI YAMAGUCHI ◽  
TSUYOSHI MUTO ◽  
KENJI HANABUSA ◽  
HIROFUSA SHIRAI
Keyword(s):  
Aqueous Solution ◽  
Organic Solvents ◽  
Solvent Polarity ◽  
Radical Formation ◽  
Light Irradiation ◽  
Side Chains ◽  
Cetyltrimethylammonium Chloride ◽  
Ionic Complex ◽  
Solubility In Water ◽  
Chloroform Methanol

Non-ionic amphiphilic zinc(II) phthalocyanine 4 with eight oxyethylene side chains exhibits excellent solubility in water and organic solvents such as benzene, chloroform, methanol, THF and DMF. The monomer–aggregate equilibrium of 4 was affected by the solvent polarity. Photoreduction of methylviologen (MV2+) in the presence of triethanolamine was also studied with the use of non-ionic complex 4 under light irradiation. The yield for the radical formation of MV2+ was greatly increased by the addition of dimethylsulfoxide (DMSO) and cetyltrimethylammonium chloride (CTAC) in aqueous solution.

The electronic spectra of nickel(II) bis(dithiocarbamate) chelates

1980 ◽  
Vol 45 (3) ◽  
pp. 791-799 ◽  
Author(s):  
Drahomír Oktavec ◽  
Bohumil Síleš ◽  
Jozef Štefanec ◽  
Elena Korgová ◽  
Ján Garaj
Keyword(s):  
Charge Transfer ◽  
Nitrogen Atom ◽  
Electronic Spectra ◽  
Alkyl Chain ◽  
Solvent Polarity ◽  
Blue Shift ◽  
Red Shift ◽  
Band Intensity ◽  
Absorption Bands

The synthesis and electronic spectra of the chelates of nickel(II) dithiocarbamates with ligands derived from dimethyl-, diethyl-, dipropyl-, dibutyl-, dipentyl-, dihexyl-, diheptyl-, dioctyl-, diisopropyl-, methylisopropylamine, piperidine, morpholine and piperazine are discussed. The absorption bands in the chelate spectra around 220 and 245 nm are assigned to absorption localized primarily in the S-C=S and N-C=S ligand groups. The analytically most important band with λmax around 330 nm assigned to M-L charge transfer is affected by alkyl substituents on the nitrogen atom and by the solvent polarity. The lengthening of the alkyl chain causes the increase in the intensity of the band and red-shift of its λmax; the increase of the polarity of the solvent leads to an increase in the band intensity and a blue shift.

scholarly journals The Coordination Chemistry of Some Sulphur-Nitrogen Ligands

2021 ◽  
Author(s):  
◽  
Allen Lee Galyer
Keyword(s):  
Coordination Chemistry ◽  
Electronic Spectra ◽  
Thiol Groups ◽  
Amino Groups ◽  
Nitrogen Ligands ◽  
Tetradentate Ligands ◽  
Nitrogen Donor

<p>Some nickel(II) and copper(II) complexes of 2-(benzylthio)ethylamine have been isolated and characterised with respect to infrared and electronic spectra. With nickel(II) only the bis salts were obtained and they were all paramagnetic. An investigation of the nickel(II) and copper(II) complexes of three tetradentate ligands, each containing two sulphur and two nitrogen donor atoms, has been made. One of these, 1,9-diamino 3,7-dithianonane has been compared to the nitrogen analogue, 1,9-diamino 3,7-diazanonane. Attempts to bridge and cyclise complexes using reactions of acetone with coordinated amino groups and halides with coordinated thiol groups are also reported. Finally a novel S-detritylation reaction is discussed.</p>

The electronic spectra of the bis(dithiocarbamate) chelates of Cu(II) and Zn(II)

1982 ◽  
Vol 47 (11) ◽  
pp. 2867-2875 ◽  
Author(s):  
Drahomír Oktavec ◽  
Jozef Štefanec ◽  
Bohumil Síleš ◽  
Ernest Beinrohr ◽  
Václav Konečný ◽  
...  
Keyword(s):  
Nitrogen Atom ◽  
Absorption Spectra ◽  
Electronic Spectra ◽  
Alkyl Chain ◽  
Solvent Polarity ◽  
Blue Shift ◽  
Red Shift

This work deals with the synthesis of dithiocarbamate chelates of Cu(II) and Zn(II) with ligands derived from dimethyl-, diethyl-, dipropyl-, dibutyl- and methylisopropylamine, piperidine and morpholine and the electronic spectra of these substances in the UV and visible regions. The absorption spectra of the cupric (and zinc(II)) chelates contain a single analytically important band around 270 (260) nm, assigned to the π-π* transition within the ligand, that is affected by the substituent on the nitrogen atom and the solvent polarity. Lengthening of the alkyl chain leads to increased intensity of the bands and a red shift of their λmax; increased solvent polarity leads to increased intensity of the bands and a blue shift.

Oligo(phenylenevinylene)s end-capped with phenothiazine or triphenylamine

2003 ◽  
Vol 771 ◽  
Author(s):  
H. Detert ◽  
O. Sadovski
Keyword(s):  
Optical Properties ◽  
Electrical Properties ◽  
Electronic Spectra ◽  
Oxidation Potential ◽  
Side Chains ◽  
Optical And Electrical Properties ◽  
Conjugation Length ◽  
Electrical And Optical Properties ◽  
End Groups ◽  
Electronic Character

AbstractMonodisperse oligo(phenylenevinylene)s end-capped with arylamines have been prepared via Horner Olefinations from bisphosphonates and arylaminobenzaldehydes. The influences of the conjugation length, different arylamine end groups, and of side chains with various electronic character on the electrical and optical properties of the chromophores are investigated. The elongation of the π-conjugated segment from 3 to 5 rings gives rise to bathochromic shifts of the electronic spectra and a slight increase of the oxidation potential. The same but more pronounced is true when the central electron donating ethers are replaced by the strong acceptor alkylsulfone. The electronic spectra of chromophores with triphenylamine and with N-alkylphenothiazines as end groups are quite similar, but the heterocyclic unit reduces the oxidation potential. The incorporation of a chromophor into a segmented copolymer has only negligible effect on the optical and electrical properties.

scholarly journals The Coordination Chemistry of Some Sulphur-Nitrogen Ligands

2021 ◽  
Author(s):  
◽  
Allen Lee Galyer
Keyword(s):  
Coordination Chemistry ◽  
Electronic Spectra ◽  
Thiol Groups ◽  
Amino Groups ◽  
Nitrogen Ligands ◽  
Tetradentate Ligands ◽  
Nitrogen Donor

<p>Some nickel(II) and copper(II) complexes of 2-(benzylthio)ethylamine have been isolated and characterised with respect to infrared and electronic spectra. With nickel(II) only the bis salts were obtained and they were all paramagnetic. An investigation of the nickel(II) and copper(II) complexes of three tetradentate ligands, each containing two sulphur and two nitrogen donor atoms, has been made. One of these, 1,9-diamino 3,7-dithianonane has been compared to the nitrogen analogue, 1,9-diamino 3,7-diazanonane. Attempts to bridge and cyclise complexes using reactions of acetone with coordinated amino groups and halides with coordinated thiol groups are also reported. Finally a novel S-detritylation reaction is discussed.</p>

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