scholarly journals A Novel Yellow Compound and Furpipate Derivatives Formed from Furfural or 5-Hydroxymethylfurfural in the Presence of Lysine

2009 ◽  
Vol 15 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Hana TOTSUKA ◽  
Konomi TOKUZEN ◽  
Hiroshi ONO ◽  
Masatsune MURATA
Keyword(s):  
Yellow Compound

ON TESTING INDIGO, WITH NOTES ON A YELLOW COMPOUND FOUND IN JAVA INDIGO

2008 ◽  
Vol 15 (5) ◽  
pp. 128-130
Author(s):  
CHRISTR. RAWSON
Keyword(s):  
Yellow Compound

The Reaction of Amino Acids and Proteins with Diazonium Compounds. I. A Spectrophotometric Study of Azo-Derivatives of Histidine and Tyrosine.

1952 ◽  
Vol 5 (4) ◽  
pp. 736 ◽  
Author(s):  
HG Higgins ◽  
D Fraser
Keyword(s):  
Amino Acids ◽  
Nitrous Acid ◽  
Spectrophotometric Study ◽  
Maximum Absorption ◽  
Direct Reaction ◽  
Quantitative Investigation ◽  
Conjugated Systems ◽  
Azo Derivatives ◽  
Derivatives Of ◽  
Yellow Compound

The coupling in alkaline solution of free histidine and tyrosine with p-diazobenzene-sulphonic acid has been studied as a basis for quantitative investigation of the behaviour of proteins in the presence of diazonium compounds. Both mono- and bisazo- derivatives may be formed with each amino acid, the wavelengths of maximum absorption being 380 and 490 mμ respectively for histidine and 325 and 480 mμ respectively for tyrosine ; the wavelength displacements on accepting a second diazonium group are comparable to effects reported for similarly conjugated systems. When appropriate corrections are made for other absorbing components, the extinctions at 490 mμ and the initial histidine concentrations up to the (bis) equivalent of diazonium compound conform to Beer's law, showing that bis(azobenzenesu1phonic acid)histidine is formed exclusively under these conditions. At higher histidine concentrations mono(azobenzenesulphonic acid)histidine is formed in increasing proportions. Even at low initial tyrosine concentrations both mono- and bis(azobenzenesulphonic acid)-tyrosine are formed, although mono-coupling is again favoured more as the concentration increases. No direct reaction between histidine and the nitrous acid used in the formation of the diazonium compound could be detected spectrophotometrically, but diazotization of tyrosine appears to reduce the propensity for bis-coupling to some extent. If urea is incorporated in the system to destroy excess nitrous acid, a yellow compound having maximum absorption at 430 mμ is formed between p-diazo-benzenesulphonic acid and the urea.

scholarly journals Solvothermal Synthesis, Crystal Structure, and Characterization of a Heterometallic Iodoplumbate

Crystals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 305
Author(s):  
Le-Qing Fan ◽  
Xiao-Tong Zhu
Keyword(s):  
Crystal Structure ◽  
Thermogravimetric Analysis ◽  
Solvothermal Synthesis ◽  
Solvothermal Reaction ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Design And Synthesis ◽  
Yellow Compound

The design and synthesis of heterometallic iodoplumbates have attracted much interest due to the diverse structures and significant physical properties. A Pb/CuI/I heterometallic iodoplumbate, [PbCu2I4(bipy)]n (1) (bipy = 2,2′-bipyridine), has been synthesized by solvothermal reaction of PbI2, Cu(NO3)2, bipy, and HI, and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, and thermogravimetric analysis. This compound exhibits one-dimensional neutral structure, which is built upon the linkages of Pb/I chains, Cu/I chains, and Cu(bipy) units. The yellow compound has an optical bandgap of 2.32 eV and shows fluorescent emission at 610 nm which is assigned to iodide-to-copper charge transfer.

scholarly journals Browning of Furfural and Amino Acids, and a Novel Yellow Compound, Furpipate, Formed from Lysine and Furfural

2007 ◽  
Vol 71 (7) ◽  
pp. 1717-1723 ◽  
Author(s):  
Masatsune MURATA ◽  
Hana TOTSUKA ◽  
Hiroshi ONO
Keyword(s):  
Amino Acids ◽  
Yellow Compound

Kaliumlithiumsulfid, KLiS: Das erste Interalkalimetallsulfid / Potassium Lithium Sulphide, KLiS: The First Inter Alkaline Metal Sulphide

1985 ◽  
Vol 40 (6) ◽  
pp. 733-735 ◽  
Author(s):  
Horst Sabrowsky ◽  
Alfred Thimm ◽  
Petra Mertens
Keyword(s):  
Crystal Structure ◽  
Least Squares ◽  
Alkaline Metal ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Metal Sulphide ◽  
Cell Parameters ◽  
Yellow Compound

Abstract The compound KLiS has been prepared and its crystal structure is determined by X-ray diffraction techniques. The hygroscopic, yellow compound crystallizes in the tetragonal space group P4/nmm (Z = 2) with the cell parameters a - 431.79(4), c = 696.20(9) pm. The structure was solved from 2100 counter reflections (356 symmetry independent reflections) through a Patterson synthesis and refinement by Fourier syntheses to a least squares residue of 0.026. The structure is characterized by c-centered squares of lithium layers interspersed by anti-parallel ordered K-S-pairs forming an anti-PbFCl-type geometry.

Copper, Thioamide Complexes. Syntheses and Structures of Di-m-chloro-bis[N-(pyridin-2-yl)benzenecarbothioamide-S,N']dicopper(I) and of Bis[N-(pyridin-2-yl)benzenecarbothioamide-S,N']copper(I) Chloride, Complxes Containing Tetrahedrally Coordinated Copper Centres

1985 ◽  
Vol 38 (6) ◽  
pp. 865 ◽  
Author(s):  
MW Fuller ◽  
V Costanzo ◽  
KS Murray ◽  
DSC Black ◽  
TW Hambly ◽  
...  
Keyword(s):  
Single Crystal ◽  
X Ray Diffraction ◽  
Binuclear Copper ◽  
Chlorine Atoms ◽  
Space Group ◽  
X Ray ◽  
Thioamide Group ◽  
Excess Copper ◽  
Pyridine Nitrogen ◽  
Yellow Compound

The mononuclear copper(I) complex Cu(PhCSNHC5H4N)2Cl (Cu( pbctaH )2Cl) and the binuclear copper(I) complex [Cu(PhCSNHC5H4N) Cl ]2 ([Cu( pbctaH ) Cl ]2) have been prepared from copper(II) chloride and N-(pyridin-2- yl ) benzenecarbothioamide ( pbctaH ) and their structures detertnined by single-crystal X-ray diffraction studies. Cu(PhCSNHC5H4)2Cl crystallizes in the space group C2/c with the parameters a 28.042(3) Ǻ, b 6.385(a) Ǻ, c 14.158(12) Ǻ, β 117.01(1)°. The stereochemistry about the copper is essentially tetrahedral, with coordination occurring through the pyridine nitrogen and the sulfur of the thioamide group, and an NCuS angle of 95.7(1)°. [Cu(PhCSNHC5H4N)2Cl]2 crystallizes in the space group C2/c with the parameters a 16.538(6) Ǻ, b 9.135(4) Ǻ, c 16.470(6) Ǻ, β 93.925(15)°. The crystal is made up of binuclear chloro -bridged units, the essentially tetrahedral stereochemistry about the copper atoms being completed by coordination from the pyridine nitrogen and the sulfur of the thioamide group, with an NCuS angle of 99.5(1)°. The Cu2Cl2 group is non-planar, with the copper atoms 0.133 Ǻ above and the chlorine atoms 0.133 Ǻ below the average plane. Other complexes can be isolated from reactions of excess copper(II) chloride with ligand although their structures have not been characterized. A diamagnetic orange compound and a paramagnetic yellow compound apparently derived from copper(n) oxidation of the thioamide were also obtained. Other products, prepared under more basic conditions, are also described. No stable copper(II) complexes of the parent thioamide could be isolated. Use of a 4-nitro substituted benzenecarbothioamide ligand did, however, produce a bis-chelated copper(II) complex.

Synthese und Kristallstruktur von 7-Azaindolato-Silber, einem dimeren Ag(I)-Komplex mit kurzem Ag-Ag-Abstand

1997 ◽  
Vol 52 (5) ◽  
pp. 604-608 ◽  
Author(s):  
J. Beck ◽  
M. Reitz
Keyword(s):  
Short Distance ◽  
Monoclinic Space Group ◽  
Space Group ◽  
Lattice Constants ◽  
Dimeric Unit ◽  
Dimeric Complexes ◽  
Yellow Compound

Abstract [Ag(C7H5N2)]2 is obtained by the slow addition of a tetrahydrofuran (thf) solution of AgClO4 to a solution of Na(C7H5N2) in thf. The slightly yellow compound crystallizes in the monoclinic space group P21/n with the lattice constants a = 554.5(1) pm, b = 954.6(2) pm, c = 1196.5(3) pm, β = 99.67(2)°. The structure consists of centrosymmetric, planar, dimeric complexes with ligand disorder in the crystal. The N atoms coordinate the Ag+ ions nearly linearly (N-Ag-N = 168°, Ag-N = 213 pm). The Ag+ ions in the dimeric unit have a short distance of 284 pm. The complexes are linked by weak intermolecular η2-Ag-C interactions to chains.

Partial characterization of the mode of action of benzoic acid on aflatoxin biosynthesis

1977 ◽  
Vol 23 (11) ◽  
pp. 1580-1584 ◽  
Author(s):  
Nduka Uraih ◽  
Timothy R. Cassity ◽  
John R. Chipley
Keyword(s):  
Benzoic Acid ◽  
Sodium Benzoate ◽  
Nicotinamide Adenine Dinucleotide Phosphate ◽  
Aflatoxin Production ◽  
Acetyl Derivative ◽  
Cell Free Extract ◽  
Synthetic Media ◽  
Aflatoxin B ◽  
Reduced Nicotinamide Adenine Dinucleotide ◽  
Yellow Compound

Aflatoxin production by a toxigenic strain of Aspergillus flavus was greatly reduced by benzoic acid and sodium benzoate in synthetic media. The reduction was accompanied by the appearance of a yellow pigment. Spectral analyses partially characterized this pigment as closely related to an acetyl derivative of a versiconal-type compound. A cell-free extract prepared from A. flavus grown in synthetic media was active in converting this yellow compound into aflatoxin B1 in the presence of reduced nicotinamide adenine dinucleotide phosphate at 25 °C (pH 7.4). In the presence of benzoic acid and its salt or autoclaved cell-free extract, conversion of yellow compound to aflatoxin B1 was prevented. These results suggest that the yellow compound is an intermediate in the secondary metabolic cycle involved in aflatoxin B1 production. Benzoic acid, sodium benzoate, or autoclaving the cell-free extract appear to have respectively blocked or denatured an enzymatic step late in the biosynthetic pathway of aflatoxin B1.

Molecular and crystal structure of a mixed-phosphine ligand Tc(II) complex, Tc(PMe2Ph)2(DMPE)Cl2

1994 ◽  
Vol 72 (10) ◽  
pp. 2183-2187 ◽  
Author(s):  
Fernande D. Rochon ◽  
Robert Melanson ◽  
Pi-Chang Kong
Keyword(s):  
Crystal Structure ◽  
Oxidation State ◽  
Ethanol Solution ◽  
Mixed Ligand ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bond Lengths ◽  
Multiple Bonding ◽  
In Cis ◽  
Yellow Compound

The reaction of Tc(PMe2Ph)3Cl3 with an excess of bis(dimethylphosphino)ethane (DMPE) in ethanol solution produced a yellow compound, which was identified by X-ray diffraction methods as a mixed-ligand Tc(II) complex, Tc(PMe2Ph)2(DMPE)Cl2. The compound crystallizes in the P21/c space group with a = 12.899(6), b = 13.142(8), c = 19.088(9) Å, β = 121.13(3)°, V = 2770(2) Å3, Z = 4, R = 0.061, and Rw = 0.051. The geometry around the Tc atom is octahedral with the chloro ligands trans to each other, while the two PMe2Ph ligands are in cis positions. The Tc—Cl bond distances are 2.431 (5) and 2.431 (5) Å while the Tc—P bond lengths are 2.434(4) and 2.435(4) Å for PMe2Ph and 2.400(4) and 2.398(4) Å for the bidentate DMPE ligand. An increase of multiple bonding of the Tc—P bond, as the oxidation state of Tc decreases, is suggested.

Eco-friend Synthesis of Isoindoline Yellow Compound and its Properties

2015 ◽  
Vol 26 (1) ◽  
pp. 74-79
Author(s):  
Song Hyuk Kim ◽  
Jae Hwan Kim ◽  
Seok Won Yang ◽  
Won-Ki Lee ◽  
Gun-Dae Lee ◽  
...  
Keyword(s):  
Yellow Compound
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