Robustness of carboxylic acid–pyridine supramolecular heterosynthon was examined in three 1:2 binary co-crystals of 4,4′-bipyridine with monocarboxylic acids, (4,4′-bipyridine)·(dl-hydroxyphenylacetic acid)2, 1; (4,4′-bipyridine)0.5·(4-bromonaphthalene-1-carboxylic acid), 2 and (4,4′-bipy...
The α, α′-annelation of the enamine of 1,3-dihydro-2-phenalenone with methyl α-(bromomethyl)acrylate affords an aromatic bicyclic framework, methyl 8,9,10,11-tetrahydro-7,11-methano-12-keto-7H-cycloocta(de)-naphthalene-9-endo-carboxylate having the ester function positioned over the aromatic...
A novel bromination of α,β-unsaturated carboxylic acids was developed via a decarboxylation by virtue of a direct anodic electro-oxidation. In this method, ammonium bromide was employed as a bromine source and the reaction features transition-metal-free, short time, and no additional supportin...
Decarboxylative sulfonylation of arylpropiolic acids has been achieved by simply employing Na2CO3 as a promoter and arenesulfinic acids as sulfonylating reagents. This simple and environmentally benign transformation offers an alternative approach and allows for easy and rapid synthesis of (E)-v...
The bacterial degradation of three thiomethyl-substituted veratrylglycerol-ß-arylethers, model compounds for soil-bound pesticide residues was investigated. Two of the model compounds were transformed to the corresponding sulfoxides.
Bis(phenylthio)methane, PhSCH2SPh, reacts with Na2[PdX4] or K2[PtX4] (X = Cl, Br, I) to form planar trans-[ML2X2] (M = Pd, Pt) containing dithioether ligands bonding in a monodentate manner. An insoluble polymer [Pd(PhSCH2SPh)Cl2]n with trans ligand bridges was also prepared. Bis(methylthio)meth...
The i.r. and Raman spectra (3500-100 cm−1) of trichloro-2,4,6(methylthio)-5 pyrimidine and of tetrachloro and tetrabromopyrimidine have been measured. The coupling of the vibrations νC-X (X = substituent) with the nuclear vibrations have been studied and the characteristics of these couplings h...
One the products isolated from the reaction of 3,3-dimethyl-4-methyl thio-1-butyne with dichlorobis(benzonitrile)palladium is chloro(2,4-bis(1′,1′-dimethyl-2′-(methylthio)ethyl)-3-furyl-C,S,Spalladium(II).
Various novel 10-alkyl-2-deoxo-2-methylthio-5-deazaflavins have been synthesized by reaction of 6-(N-alkylanilino)-2-methylthiopyrimidin-4(3H)-ones with Vilsmeier reagent. The similar 2-(N-substituted amino) derivatives were prepared by nucleophilic replacement reaction of the 2-methylthio moiet...
The FT-IR and FT-Raman vibrational spectra of 2,4-dichloro-5-nitropyrimidine (DCNP) and 4-methyl-2-(methylthio)pyrimidine (MTP) have been recorded in the range 4000–400 and 3600–50 cm−1, respectively. A detailed vibrational spectral analysis has been carried out and assignments of the observed...
In this work, a series of biodegradable polyurethanes (PURs) based on cholic acid (CA) and l-lysine diisocyanate ethyl ester (L-LDI) that are renewable difunctional building blocks is synthesized by step-growth polymerization. Step-growth polymerizations between CA and L-LDI are conducted at dif...
Study of glasses with a high content of rare earth elements has a particular interest due to their use in nuclear waste storage. New glass matrices are required to immobilize even higher concentrations of high-level waste in comparison to borosilicate glasses already used. We study the effect of...
The local structure and crystallization behavior of the stoichiometric La2O3⋅3B2O3 (LaMB) metaborate glass doped with Nd3+ or Eu3+ ions are studied using differential thermal analysis (DTA), X-ray diffraction (XRD), Raman scattering and 11B magic-angle spinning nuclear magnetic resonance (MAS NM...
Besides their interesting optical properties, Rare Earths (RE) can be found abundantly as fission products at the end of the nuclear fuel cycle. After reprocessing, they are stored by dissolution in a borosilicate glassy matrix. RE are also used to simulate actinides when studying nuclear waste ...
The normal mode frequencies and corresponding vibrational assignments of trifluoroboroxine in D3h symmetry are examined theoretically using the gaussian 98 set of quantum chemistry codes. All normal modes were successfully assigned to one of assigned to one of five types of motion (B–F stretch,...
Er3+-doped strontium borate glasses 10SrCO3–2SrF2–3Li2CO3–85H3BO3:xEr3+ (x=0.5, 1.0, 2.0 and 3.0) were synthesized via conventional melt quenching technique. The emission spectra, the luminescence decay curves and upconversion emission spectra were measured. Under the excitation of a 980 nm l...
Terbium doped strontium-lanthanum borate, Sr3La2(BO3)4:Tb (SLB), was studied by semi-empirical computational approaches using PM6 parametrization and the SPARKLE model for lanthanide(III) (Ln(III)) cations. The focus of interest was on structural aspects, e.g. the cell parameters and distributio...
In the present work physical, optical and thermoluminescence studies of Dy3 + ion doped sodium strontium borate glasses have been reported. XRD study confirms the amorphous nature of glass and the increasing concentration of Dy2O3 results in broadening and shifting of the XRD peak. FTIR shows no...
We report the modified thermoluminescence (TL) response of a new melt-quench synthesized strontium (Sr) doped lithium borate (LBSr) glass system co-doped with copper (Cu). Both Sr (0.5–2.5 mol%) and Cu (0.005–0.1 mol%) concentrations are varied to determine the optimum TL properties by exposin...
Present work reports the synthesis of Europium doped strontium borate (Eu2+: SrB4O7) using solution combustion route with urea as fuel. Also the thermo-luminescence properties of the as prepared phosphor are investigated. Phase analysis of the prepared compound was carried out using X-ray diffra...
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