1,721,046 research outputs found
Ahmed Hussein, F. A. Devillanova, F. Isaia, G. Verani Copper(I) complexes with N-methylbenzothiazole-2-thione and -2-selone. Transit. Metal Chem., 1985, 10, 368.
No full textN-methylbenzothiazole-2-thione (bttme) and -2-selone (btseme) form complexes with CuX 2 (X=Cl, Br, NO 3, 1/2SO 4 or BF 4). The reaction, carried out in MeOH, produces complexes of copper(I), whose stoichiometry mainly depends on the ligand. Infrared evidence shows that the coordination occurs through the exo-sulphur and selenium atoms
1,1,3,3-Tetramethylindan-2-selone−Benzyne Adduct: An Isolable 2<i>H</i>-Benzoselenete
No full text1,1,3,3-Tetramethylindan-2-selone−Benzyne Adduct:
An Isolable 2H-Benzoselenet
Reaction of Imidazoline-2-Selone with Acids and Its Use for Selective Coordination of Platinum Ions on Silica Surface
No full textReaction of Imidazoline-2-Selone with Acids and Its Use for Selective Coordination of Platinum Ions on Silica Surfac
Reaction of Imidazoline-2-Selone with Acids and Its Use for Selective Coordination of Platinum Ions on Silica Surface
No full textReaction of Imidazoline-2-Selone with Acids and Its Use for Selective Coordination of Platinum Ions on Silica Surfac
Synthesis of a new chiral auxiliary — Non-cross-linked polystyrene-supported oxazolidine-2-selone
No full text A new chiral auxiliary, non-cross-linked polystyrene-supported oxazolidine-2-selone was synthesized using N-Boc-l-tyrosine ethyl ester as starting material. The structure of the target product was detected by IR, NMR, elemental analysis, and the spectrum result was consistent with the molecular structure. </jats:p
Role of the Solvent in the Reactivity of Bis-4-imidazoline-2-selone Derivatives toward I<sub>2</sub>: An Experimental and Theoretical Approach
No full textThe reactivity of 1,1′-bis(3-methyl-4-imidazolin-2-selone)methane
(L1) and 1,2-bis(3-methyl-4-imidazolin-2-selone)ethane
(L2) toward I2 has been explored in MeCN under
different experimental conditions and compared with that in CH2Cl2. The compounds [L1′](I)2 (I), [L1I]n(I)n (II), [L1(μ-Se)](I)2·1/2H2O (III), [L1I](I3)·2I2 (IV), and [L2](I)2·MeCN
(V) were obtained and characterized. X-ray diffraction
analyses point out an ionic nature for these compounds, which is presumably
favored by the polarity of the solvent used. In particular, [L1I]n(I)n (II) represents the first example of an iodonium
complex of imidazoline-2-selone derivatives, while [L1(μ-Se)](I)2·1/2H2O (III) represents a unique example of a dicationic [RSeSeSeR] triselane.
Density functional theory calculations have allowed us to better understand
the nature of the obtained compounds and to justify their formations
in polarizing reaction conditions rather than in low polar solvents
Role of the Solvent in the Reactivity of Bis-4-imidazoline-2-selone Derivatives toward I2: An Experimental and Theoretical Approach
Full text linkThe reactivity of 1,1 '-bis(3-methyl-4-imidazolin-2-selone)methane (L1) and 1,2-bis(3-methyl-4-imidazolin-2-selone)ethane (L2) toward I2 has been explored in MeCN under different experimental conditions and compared with that in CH2Cl2. The compounds [L1 '](I)2 (I), [L1I]n(I)n (II), [L1(mu-Se)](I)2 center dot 1/2H2O (III), [L1I](I3)center dot 2I2 (IV), and [L2](I)2 center dot MeCN (V) were obtained and characterized. X-ray diffraction analyses point out an ionic nature for these compounds, which is presumably favored by the polarity of the solvent used. In particular, [L1I]n(I)n (II) represents the first example of an iodonium complex of imidazoline-2-selone derivatives, while [L1(mu-Se)](I)2 center dot 1/2H2O (III) represents a unique example of a dicationic [RSeSeSeR] triselane. Density functional theory calculations have allowed us to better understand the nature of the obtained compounds and to justify their formations in polarizing reaction conditions rather than in low polar solvents
Reaction of imidazoline-2-selone derivatives with mesityltellurenyl iodide: a unique example of a 3c-4e Se→Te←Se three-body system embedding a tellurenyl cation
No full textThe reactions of 1,1'-bis(3-methyl-4-imidazolin-2-selone)methane (L-1) and 1,2-bis(3-methyl-4-imidazolin-2-selone)ethane (L-2) with mesityltellurenyl iodide (MesTeI) [Mes = 2,4,6-Me3C6H2] yielded the neutral [L-1 center dot 2MesTeI]center dot 2CH(2)Cl(2) and the ionic [L-2 center dot MesTe](2)(MesTeI(2))(2) compounds, respectively, which were characterized by X-ray diffraction analysis. DFT (mPW1PW//LANL08d/def2-SVP) and NBO calculations, supported by structural and FT-Raman measurements, show that the latter compound represents the first example of an authentic mesityltellurenyl cation, [MesTe](+), stabilized within a [MesTe(B)(2)](+) (B = Lewis base) charge transfer adduct featuring a 3c-4e Se -> Te <- Se three-body system
Reaction of N,N'-dimethylimidazolidine-2-selone (4) with TCNQ. Characterisation and X-ray crystal structure of the mixed-valence compound 4.(TCNQ)(1.167)
No full textThe reaction of 1,3-dimethyl-2-imidazolidineselone (I) with TCNQ affords lustrous dark crystals with elemental anal. corresponding to the formula I·(TCNQ)1.167. X-Ray crystal structure detn. shows that this compd. is formed by discrete [I2]2+ dications, in which two oxidized imidazolidine mols. are bonded through an -Se-Se- bridge [2.5187(7) Å]. These dications interact on one side with a third disordered mol. of I (occupancy factor 0.5) via Se···Se soft interactions of 2.715(4) and 2.899(4) Å to give almost linear -Se-Se···Se- arrangements [Se(2)-Se(1)···Se(3), 177.64(6)° and Se(2)-Se(1)···Se(3a), 167.89(5)°]. The unit cell contains six imidazolidine mols. bearing a total of four pos. charges, balanced by four neg. charges distributed on seven TCNQ mols., stacked in two dimers and a trimer. Structural data suggest that the neg. charges are unevenly distributed on the TCNQ mols. Single crystal IR spectra also suggest the presence of at least three differently charged TCNQ's, and in addn. indicate a room temp. optical gap of ∼0.3 eV, placing this compd. among wide bandgap semiconductors (σ = 3.45 × 10-3 S cm-1). Cyclic voltammetry of I is discussed in comparison with those of previously studied 2-imidazolineselone derivs. [i.e., 1,3-dihydro-1,3-dimethyl-2H-imidazole-2-selone, 1,1'-methylenebis[1,3-dihydro-3-methyl-2H-imidazole-2-selone], 1,1'-(1,2-ethanediyl)bis[1,3-dihydro-3-methyl-2H-imidazole-2-selone]], and shows that for this donor the achievement of a mixed valence compd. with TCNQ is possible in MeCN
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