scholarly journals Water-soluble β-aminobisulfonate building blocks for pH and Cu2+ indicators

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 84712-84721 ◽  
Author(s):  
Maria A. Cardona ◽  
Marina Kveder ◽  
Ulrich Baisch ◽  
Michael R. Probert ◽  
David C. Magri
Keyword(s):  
Nmr Spectroscopy ◽  
Building Blocks ◽  
Water Soluble ◽  
Visible Absorption ◽  
H Nmr ◽  
Uv Visible

Two phenyl β-aminobisulfonate ligands characterised by UV-visible absorption, EPR and 1H NMR spectroscopy exhibit evidence for binding with Cu2+ in water and methanol.

Pyridone substituted phthalocyanines: Photophysico-chemical properties and TD-DFT calculations

2018 ◽  
Vol 22 (01n03) ◽  
pp. 25-31 ◽  
Author(s):  
Şaziye Abdurrahmanoğlu ◽  
Mevlüde Canlıca ◽  
John Mack ◽  
Tebello Nyokong
Keyword(s):  
Electronic Structure ◽  
Nmr Spectroscopy ◽  
Dft Calculations ◽  
Chemical Properties ◽  
Quantum Yields ◽  
Visible Absorption ◽  
H Nmr ◽  
Td Dft ◽  
Ft Ir ◽  
Uv Visible

4-(6-methyl-3-nitro-2-oxo-1,2-dihydropyridin-4-yloxy)phthalonitrile has been used to prepare a novel Zn(II) phthalocyanines with four peripheral pyridone substituents. The compound has been characterized by UV-visible absorption, FT-IR and [Formula: see text]H-NMR spectroscopy, elemental analysis and MALDI-TOF mass spectroscopy. The fluorescence, triplet quantum and singlet oxygen quantum yields have been determined and TD-DFT calculations have been used to identify trends in the electronic structure.

Synthesis of perialkynylated tetrapyrazinoporphyrazines and its Optical Properties

2009 ◽  
Vol 2009 (5) ◽  
pp. 312-316 ◽  
Author(s):  
Chun Keun Jang ◽  
Jae Yun Jaung
Keyword(s):  
Optical Properties ◽  
Nmr Spectroscopy ◽  
Laser Desorption ◽  
Diels Alder ◽  
Visible Spectroscopy ◽  
H Nmr ◽  
Uv Visible ◽  
Tof Ms ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

Some phthalocyanines soluble in organic solvents have been developed by peripheral introduction of substituent groups. We report a new method for preparation of the polyphenyl-substituted dicyanopyrazines based on the [2 + 4] Diels-Alder cycloaddition of the tetraphenylcyclopentadienone to an ethynyl compound. The synthesised tetrapyrazinoporphyrazinato metal complexes were characterised by UV-visible spectroscopy, MALDI-TOF-Ms (matrix-assisted laser desorption ionisation time-of-flight mass) spectroscopy, and 1H NMR spectroscopy.

Meso-aryl-ß-pyrrolic positions interactions in meso-tetraarylporphyrins: Flat arylporphyrins and building blocks for oligoporphyrins

2004 ◽  
Vol 08 (02) ◽  
pp. 111-119 ◽  
Author(s):  
Henry J. Callot ◽  
Romain Ruppert ◽  
Christophe Jeandon ◽  
Sébastien Richeter
Keyword(s):  
Building Blocks ◽  
Absorption Bands ◽  
Visible Absorption ◽  
Aryl Ring ◽  
Porphyrin Macrocycle ◽  
Uv Visible

Aryl groups bound to the meso positions of porphyrins often react with neighboring groups, in particular ß-acyl groups to give highly diversified monomeric and dimeric new functionalized porphyrins. The products, whose meso-aryl ring approaches coplanarity with the porphyrin macrocycle, show large shifts of UV-visible absorption bands and various potentialities for building external chelating moieties and assembling oligoporphyrins.

scholarly journals Novel acridine-based thiosemicarbazones as ‘turn-on' chemosensors for selective recognition of fluoride anion: a spectroscopic and theoretical study

2018 ◽  
Vol 5 (7) ◽  
pp. 180646 ◽  
Author(s):  
Ibanga Okon Isaac ◽  
Iqra Munir ◽  
Mariya al-Rashida ◽  
Syed Abid Ali ◽  
Zahid Shafiq ◽  
...  
Keyword(s):  
Density Functional ◽  
Theoretical Study ◽  
Fluoride Anion ◽  
Metal Fluoride ◽  
Visible Absorption ◽  
Functional Theory ◽  
H Nmr ◽  
Tetrabutylammonium Fluoride ◽  
Uv Visible ◽  
Nickel Fluoride

New thiosemicarbazide-linked acridines 3a–c were prepared and investigated as chemosensors for the detection of biologically and environmentally important anions. The compounds 3a–c were found selective for fluoride (F − ) with no affinity for other anions, i.e. − OAc, Br − , I − , HSO 4 − , SO 4 2− , PO 4 3− , ClO 3 − , ClO 4 − , CN − and SCN − . Further, upon the gradual addition of a fluoride anion (F − ) source (tetrabutylammonium fluoride), a well-defined change in colour of the solution of probes 3a–c was observed. The anion-sensing process was studied in detail via UV–visible absorption, fluorescence and 1 H-NMR experiments. Moreover, during the synthesis of acridine probes 3a–c nickel fluoride (NiF 2 ), a rarely explored transition metal fluoride salt, was used as the catalyst. Theoretical studies via density functional theory were also carried out to further investigate the sensing and anion (F − ) selectivity pattern of these probes.

scholarly journals Synthesis and Visible Spectral Behaviour of Some New Photosensitizers: Monomethine, Dimethine, Trimethine, Styryl and Mixed Cyanine Dyes

1999 ◽  
Vol 23 (12) ◽  
pp. 700-701
Author(s):  
Hassan A. Shindy
Keyword(s):  
Nmr Spectroscopy ◽  
Absorption Spectra ◽  
Elemental Analysis ◽  
Cyanine Dyes ◽  
Visible Absorption ◽  
H Nmr ◽  
Spectral Behaviour

The new photosensitizers, monomethine, dimethine, trimethine, styryl and mixed cyanine dyes incorporating pyrazolo/oxazole(thiazole) nuclei are prepared; the visible absorption spectra for all the synthesized cyanines were examined in 95% ethanol; structural confirmation is carried out by elemental analysis, IR and 1H NMR spectroscopy.

scholarly journals Synthesis and Evaluation of a Water-Soluble Hyperbranched Polymer as Enhanced Oil Recovery Chemical

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Nanjun Lai ◽  
Xiaoping Qin ◽  
Zhongbin Ye ◽  
Qin Peng ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Hyperbranched Polymer ◽  
Raw Materials ◽  
Retention Rate ◽  
Water Soluble ◽  
Core Flooding ◽  
H Nmr ◽  
Initiation System

A novel hyperbranched polymer was synthesized using acrylamide (AM), acrylic acid (AA),N-vinyl-2-pyrrolidone (NVP), and dendrite functional monomer as raw materials by redox initiation system in an aqueous medium. The hyperbranched polymer was characterized by infrared (IR) spectroscopy,1H NMR spectroscopy,13C NMR spectroscopy, elemental analysis, and scanning electron microscope (SEM). The viscosity retention rate of the hyperbranched polymer was 22.89% higher than that of the AM/AA copolymer (HPAM) at 95°C, and the viscosity retention rate was 8.17%, 12.49%, and 13.68% higher than that of HPAM in 18000 mg/L NaCl, 1800 mg/L CaCl2, and 1800 mg/L MgCl2·6H2O brine, respectively. The hyperbranched polymer exhibited higher apparent viscosity (25.2 mPa·s versus 8.1 mPa·s) under 500 s−1shear rate at 80°C. Furthermore, the enhanced oil recovery (EOR) of 1500 mg/L hyperbranched polymer solutions was up to 23.51% by the core flooding test at 80°C.

Tetra-2,3-pyrazinoporphyrazines with externally appended pyridine rings. 18. Physicochemical properties and photochemical behavior of new uncharged water soluble low-symmetry macrocycles [{Pd(OAc)2}3(PtCl2)LM] (M = MgII(H2O), ZNII, PdII)

2017 ◽  
Vol 21 (04-06) ◽  
pp. 334-344 ◽  
Author(s):  
Maria Pia Donzello ◽  
Fabio Gigante ◽  
Fabiola Sciscione ◽  
Elisa Viola ◽  
Karl M. Kadish
Keyword(s):  
Physicochemical Characterization ◽  
Water Soluble ◽  
Experimental Conditions ◽  
Visible Absorption ◽  
New Class ◽  
Enhanced Solubility ◽  
Uv Visible ◽  
Low Symmetry ◽  
Visible Absorption Spectroscopy

The synthesis and physicochemical characterization of a new class of low-symmetry water soluble heteropentanuclear porphyrazine complexes are described. The investigated compounds, represented as [{Pd(OAc)[Formula: see text]}[Formula: see text](PtCl[Formula: see text]LM] •xH[Formula: see text]O where L [Formula: see text] tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazinato dianion, M [Formula: see text] Mg[Formula: see text](H[Formula: see text]O), Zn[Formula: see text] or Pd[Formula: see text] and [Formula: see text] 3–8, were prepared under mild experimental conditions from the previously described heterobimetallic compounds [(PtCl[Formula: see text]LM]. Peripheral binding of one PtCl[Formula: see text]and three Pd(OAc)[Formula: see text]units in the new series of compounds occurs at the vicinal pyridine N atoms of each dipyridinopyrazine fragment via a “py–py” coordination. The newly synthesized porphyrazines were characterized by IR measurements in the solid state and UV-visible absorption spectroscopy in the polar nonaqueous solvents pyridine, dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) as well as in water, the enhanced solubility in this medium being due to the presence of the external Pd(OAc)[Formula: see text] moieties. Data on the photosensitizing activity of the compounds for the generation of singlet oxygen, [Formula: see text]O[Formula: see text] were also obtained in DMF and should be of interest to researchers in the area of photodynamic therapy.

scholarly journals CuAAC-based assembly and characterization of a ruthenium–copper dyad containing a diimine–dioxime ligand framework

2017 ◽  
Vol 198 ◽  
pp. 251-261 ◽  
Author(s):  
Nicolas Queyriaux ◽  
Eugen S. Andreiadis ◽  
Stéphane Torelli ◽  
Jacques Pecaut ◽  
Brad S. Veldkamp ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Light Activation ◽  
Visible Absorption ◽  
H Nmr ◽  
Steady State Fluorescence ◽  
Molecular Dyads ◽  
Uv Visible ◽  
Photocatalytic Applications ◽  
Copper Centre

The design of molecular dyads combining a light-harvesting unit with an electroactive centre is highly demanded in the field of artificial photosynthesis. The versatile Copper-catalyzed Azide–Alkyne Cycloaddition (CuAAC) procedure was employed to assemble a ruthenium tris-diimine unit to an unprecedented azide-substituted copper diimine–dioxime moiety. The resulting RuIICuII dyad 4 was characterized by electrochemistry, 1H NMR, EPR, UV-visible absorption, steady-state fluorescence and transient absorption spectroscopies. Photoinduced electron transfer from the ruthenium to the copper centre upon light-activation in the presence of a sacrificial electron donor was established thanks to EPR-monitored photolysis experiments, opening interesting perspectives for photocatalytic applications.

scholarly journals Assessment of Dyeing Properties of Novel Bisazo-Bisazomethine Disperse Dyes on Polyester Fabric

2011 ◽  
Vol 8 (3) ◽  
pp. 1218-1225 ◽  
Author(s):  
B. C. Dixit ◽  
D. M. Patel
Keyword(s):  
Aromatic Amines ◽  
Polyester Fabric ◽  
Spectral Studies ◽  
Disperse Dyes ◽  
Fastness Properties ◽  
Visible Absorption ◽  
Polyester Fabrics ◽  
H Nmr ◽  
Dyeing Performance ◽  
Uv Visible

Novel bisazo-bisazomethine disperse dyes were prepared by the coupling of diazotized solutions of various aromatic amines with 2,2'-{sulfonylbis [4,1-phenylene nitrilomethylylidene]} diphenol (SB). Above Schiff base was prepared by the condensation of 2-hydroxybenzaldehyde with 4,4’-sulphonyl- dianiline (Dapson). The resultant dyes were characterized by elemental analysis, IR and1H NMR spectral studies. The UV Visible absorption spectral data were investigated in dimethylformamide (DMF) and are discussed in terms of structural property relationship. Their dyeing performance as disperse dyes has been assessed on polyester fabrics. The results show that a better hue was obtained on polyester fabrics and have mild to moderate fastness properties.

Synthesis of metal-chelates of amino sugars: Schiff's base complexes

1982 ◽  
Vol 60 (17) ◽  
pp. 2229-2237 ◽  
Author(s):  
Michael J. Adam ◽  
Laurance D. Hall
Keyword(s):  
Esr Spectroscopy ◽  
Water Soluble ◽  
Amino Sugars ◽  
Hydroxybenzoic Acid ◽  
Binuclear Copper ◽  
Soluble Complex ◽  
Schiff’S Base ◽  
Visible Absorption ◽  
H Nmr ◽  
Water Soluble Complex

Metal-complexing, salicylaldimine ligands 4, 7, 8, and 9 have been synthesized from 2-amino-2-deoxy-D-glucopyranose and some of its derivatives with salicylaldehyde and 3-formyl-2-hydroxybenzoic acid. Copper(II), zinc, and cobalt(II) complexes were formed from ligand 7, whereas only copper(II) would complex with ligand 8. The sugar ligand 4 forms a water-soluble complex with copper(II) and ligand 9 forms a binuclear copper(II) complex. These products have been studied by 1H nmr, visible absorption, and esr spectroscopy, mass spectrometry, and by their magnetic moment data.

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