V. Ganesh

Bio: V. Ganesh is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Crystal structure & Bromide. The author has an hindex of 2, co-authored 4 publications receiving 5 citations.

A novel mixed valence iodide bridged Te(II)-Te(IV) complex featuring diisopropyldithiocarbamate(L) and iodide: ILTeII(I)TeIVL2I

Abstract: The title compound is a novel mixed ligand and mixed valence complex of tellurium, the crystal structure of which is reported here. The compound crystallizes in the orthorhombic space group, Pca21 with four molecules per unit cell, the dimensions of which area=15.209(1),b=20.159(2),c=12.453(1) A. The structure was solved by the heavy-atom method and refined by fullmatrix least-squares method to a finalR=0.046 andRw=0.046 for 3011 unique reflections. The structure could be considered as 1∶1 adduct of TeIVL2I2 and TeIILI (L=diisopropyldithiocarbamate). The two tellurium atoms, TeII[Te(1)] and TeIV[Te(2)] display entirely different coordinations and are bridged through iodine I(1) in a symmetrical manner. There is a short Te(1)⋯Te(2) contact distance of 3.542(1) A.

2-(2-THIOXO-1,3-THIAZOLIDIN-3-YL)-4,5-DIHYDRO-l,3-THIAZOLIUM BROMIDE. 1HNMR, MASS SPECTRAL, X-PES STUDIES AND

Abstract: The title compound is formed by the rearrangement of 2,2′-dithiobis[4,5-dihydrothiazole] with the extrusion of one sulfur in dilute hydrobromic acid medium. 1HNMR, Mass spectral, X-PES studies and crystal structure determination have been carried out. While the Mass spectrum showed the presence of three sulfurs in the molecule, the presence of four triplets in the 1HNMR spectrum ruled out the symmetrical sulfide isomer. The unit cell is monoclinic, P21/c, with a = 11.236(1), b = 10.138(1), c = 9.571(1)A, β = 111.89°(1), V = 1011.63A3, D m = 1.85 Mg/m3 D c = 1.86 Mg/m3, at 2% K for four molecules per unit cell. From 1498 unique reflections for which I > 3σ (I), R = 0.051, with anisotropic thermal parameters for all non-hydrogen atoms. Both the five membered heterocyclic rings adopt the half chair conformation. Hydrogen bonding occurs involving the dihydrothiazolyl nitrogen, the proton attached to it and the bromide.

Crystal and molecular structure of bis(o-phenylenethiourea)selenium(II)chloride dihydrate, C14H12N4S2Cl2Se·2H2O

Abstract: The synthesis and crystal structure ofbis(o-phenylenethiourea)selenium(II)-chloride dihydrate, Se(C7H6N2S)2Cl2·2H2O are reported. The compound crystallizes in the monoclinic space group, P21/n, with four molecules per unit cell, the dimensions of which area=10.243(3),b=13.341(4),c=14.273(4) A,β=93.00(3)°,U=1947.76 A3. The structure was solved by direct methods and refined by full-matrix least-squares toR=0.039 andR w =0.040 for 3314 unique reflections. Selenium displays two strong coordinations arising from the two sulfurs, Se-S(1)=2.191(1), Se-S(2)=2.206(1) A, and S(1)-Se-S(2)=101.0(1)°, and four secondary interactions involving three chlorines and one sulfur. The complex occurs as a dimer with two sets of very weakly interacting bridging pairs S(2), S(2)a; and Cl(2), Cl(2)a, where “a” denotes the inversion related atom. Lattice stabilization is ensured by the extensive network of hydrogen bonds involving chlorines, water oxygens, and nitrogens of phenylenethiourea ligands.

Mass spectra of new heterocycles: XIII. Fragmentation of 2-(prop-1-en-1-yl)-4,5-dihydro-1,3-thiazoles under electron impact and chemical ionization

Abstract: Fragmentation of 2-(prop-1-en-1-yl)-4,5-dihydro-1,3-thiazoles synthesized from alkoxyallenes or propargylbenzene, isothiocyanates, and benzyl, allyl, or propargyl bromide has been studied under electron impact (70 eV) and chemical ionization (with methane as reactant gas). All compounds under electron impact give rise to stable molecular ions whose decomposition involves concurrent dihydrothiazole ring cleavage and elimination of substituents. The fragmentation pattern is largely determined by the nature of the substituent on C5. Chemical ionization of 4,5-dihydro-1,3-thiazole derivatives is typically accompanied by protonation and electrophilic addition with subsequent elimination of nitrile molecule. No substituent effect on the fragmentation pattern under chemical ionization has been revealed. Unlike electron impact and chemical ionization, the most abundant ion in the MALDI mass spectrum of 2-[(Z)-1-butoxyprop-1-en-1-yl]-4,4-dimethyl-5-phenyl-4,5-dihydro-1,3-thiazole is [M — H]+.

Synthesis and structure of bisiodobis(diisopropyldithiocarbamato)tellurium(IV)

Abstract: The title mixed ligand complex was synthesized by the controlled oxidative displacement reaction of TeL 4 ″ by iodine (L″ is diisopropyldithiocarbamate ion). Its crystals are monoclinic, space group P21 withZ=2 in a unit cell of dimensionsa=8.344(4),b=14.113(8),c=10.647(5) A,β=99.884(2)°, andV=1235.15 A3, finalR=0.043 andR w =0.047 for 3553 unique reflections. The central tellurium atom shows a S4I2 six coordination with the two dithiocarbamate groups almost isobidentate, the average Te-S and the Te-I distances being 2.571(3) and 3.011(1) A, respectively. The structure is monomeric in the solid state. No intermolecular short contacts are observed.

SYNTHESIS AND STRUCTURE OF THE FIRST MIXED HALIDE-DITHIOCARBAMATE COMPLEX OF SE(II), BROMODIETHYLDITHIO-CARBAMATOSELENIUM(II), [Se{(C2H5)2NCS2}Br]

Abstract: The title compound, SeLBr [L− = diethyldithiocarbamate, (C2H5)2NCS2 −] is the first example of Se(II) complex featuring a dithiocarbamate and a halide. It was obtained by the reaction of Se(IV)bromide with tetraethylthiuram disulfide in a methanol solution containing hydrobromic acid. The structure determination of the compound shows it to be polymeric with bromine being the bridging ligand. The crystals of SeLBr are monoclinic with a = 10.391(3), b = 8.434(4), c = 12.030(2) A, β = 108.10(2)°, V = 1002.15 A3, Z = 4 and space group, P21/n; R = 0.073, Rw = 0.074.