3449-05-6Relevant articles and documents
Molecular structure and dynamics in the low temperature (orthorhombic) phase of NH3BH3
Cho, Herman,Shaw, Wendy J.,Parvanov, Vencislav,Schenter, Gregory K.,Karkamkar, Abhijeet,Hess, Nancy J.,Mundy, Chris,Kathmann, Shawn,Sears, Jesse,Lipton, Andrew S.,Ellis, Paul D.,Thomas Autrey
, p. 4277 - 4283 (2008)
Variable temperature 2H NMR experiments on the orthorhombic phase of selectively deuterated NH3BH3 spanning the static to fast exchange limits of the borane and amine motions are reported. New values of the electric field gradient (EFG) tensor parameters have been obtained from the static 2H spectra of Vzz = 1.652 (±0.082) × 1021 V/m2 and η = 0.00 ± 0.05 for the borane hydrogens and Vzz = 2.883 (±0.144) × 10 21 V/m2 and η = 0.00 ± 0.05 for the amine hydrogens. The molecular symmetry inferred from the observation of equal EFG tensors for the three borane hydrogens and likewise for the three amine hydrogens is in sharp contrast with the Cs symmetry derived from diffraction studies. The origin of the apparent discrepancy has been investigated using molecular dynamics methods in combination with electronic structure calculations of NMR parameters, bond lengths, and bond angles. The computation of parameters from a statistical ensemble rather than from a single set of atomic Cartesian coordinates gives values that are in close quantitative agreement with the 2H NMR electric field gradient tensor measurements and are more consistent with the molecular symmetry revealed by the NMR spectra.
The reaction of diborane with trimethylamine-alane and dimethylaminoalane
Keller, Philip C.
, p. 256 - 258 (1972)
Diborane adds to trimethylamine-alane in toluene or diethyl ether to produce (CH3)3N · Al(BH4)3. The action of excess diborane in toluene establishes an equilibrium competition between aluminum borohydride and d
Nucleus targeting anthraquinone-based copper (II) complexes as the potent PDT agents: Synthesis, photo-physical and theoretical evaluation
Devi, Joshila,Devi, Longjam Reena,Musib, Dulal,Ramu, Vanitha,Raza, Md Kausar,Roy, Mithun
, (2020)
Present work explored the structural aspects of four new anthraquinone-based copper(II)complexes of the general formula [Cu(L1)B] (1, 2) and [Cu(L2)B] (3, 4) where L1 = 2-((2-mercaptophenylimino)methyl)phenol, L2 = 2-((2-mercaptophenylimino)methyl)-4,6-di-tert-butylphenol and B are 1,10-phenanthroline,dipyrido[3,2-d:2′,3′-f]quinoxaline-8,9-napthaquinone, in modulating in vitro photo-dynamic activities. Nucleus targeting complexes have shown remarkable cytotoxicity in visible-light to cancer cells (IC50 ～ 2–11 μM) with reduced dark toxicity (IC50 > 50 μM) unlike other copper (II) complexes. Singlet oxygen generated on photo-sensitization of the complexes was the key cytotoxic species responsible for apoptotic damage of cancer cells. Degree of photo-cytotoxicity of the photo-activated complexes was related to the extent of 1O2 generation which was probed by several photo-physical studies along with TD-DFT calculations. Presence of low-lying, long-lived triplet excited state and hence increased ability to generate 1O2 from 3O2 through type-II photo-process was proposed to explain the degree of photo-cytotoxicity of the complexes. We observed dual photo-sensitization of S-coordination and anthraquinone moiety for the complex 4 leading to remarkable PDT effect to cancer cells with minimal dark toxicity. Overall, our investigations on exploring the structural aspects of copper (II) complexes for PDT were a phenomenal break-through in developing copper-based photo-chemotherapeutics in the clinical arena of cancer therapy.
Alkali metal reductions of some trimethylamine-haloboranes and bis(trimethylamine)dihydroboronium iodide
Gragg,Ryschkewitsch
, p. 1209 - 1212 (1976)
Trimethylamine-bromoborane and trimethylamine-iodoborane were reduced with Na-K alloy in several solvents. The data obtained support the contention that a reactive intermediate, [(CH3)3NBH2:]-, was produced which reacts via two paths, in varying degrees of significance, depending on the solvent used. The synthesis of (CH3)3NBD2H was demonstrated. The synthesis of 1,1,3,3-tetramethyl-1,3-diazonia-2,4-diboratocyclopentane was improved. An improved synthesis for 1,1,4,4-tetramethyl-1,4-diazonia-2,5-diboratocyclohexane was also found.
Real-time evaluation of aluminum borohydride trimethylamine for aluminum chemical vapor deposition
Kang, Sang-Woo,Park, Young-Jae,Kim, Yong-Sung,Shin, Yong-Hyeon,Yun, Ju-Young
, p. H333-H339 (2009)
The chemical species in gas phase and on the surface of aluminum borohydride trimethylamine (ABHTMA) for aluminum chemical vapor deposition as a function of the hot-wall temperature and the chamber pressure were studied using two kinds of Fourier transfor
A nanoparticle based chromogenic chemosensor for the simultaneous detection of multiple analytes
Singh, Narinder,Mulrooney, Ray C.,Kaur, Navneet,Callan, John F.
, p. 4900 - 4902 (2008)
Quantum Dot-Schiff base conjugate 2 displays selectivity for Cu 2+ and Fe3+ enabling the simultaneous detection of these ions in semi-aqueous solution; in contrast, the Schiff base itself displayed no selectivity. The Royal Society of Chemistry.
Synthesis, characterization and electrochemical behavior of some Ni(II), Cu(II), Co(II) and Cd(II) complexes of ONS type tridentate Schiff base ligand
Durmus, Sefa,Atahan, Alparslan,Zengin, Mustafa
, p. 1 - 5 (2011)
Tridentate Schiff base (H2L) ligand was synthesized via condensation of o-hydroxybenzaldehyde and 2-aminothiophenol. The metal complexes were prepared from reaction of the ligand with corresponding metal salts presence of substituted pyridine in two different solvents (MeOH or MeCN). The ligand and metal complexes were then characterized by using FTIR, TGA, 1H NMR and 13C NMR spectroscopies. The FTIR spectra showed that H2L was coordinated to the metal ions in tridentate manner with ONS donor sites of the azomethine N, deprotonated phenolic-OH and phenolic-SH. Furthermore, substituted pyridine was coordinated to the central metal atoms. The thermal behavior of the complexes was investigated by using TGA method and dissociations indicated that substituted pyridine and ligand were leaved from coordination. This coordination of the metal complexes was correlated by 1H NMR and 13C NMR. Finally, electrochemical behavior of the ligand and a Ni(II) complex were investigated.
Efficient and facile catalyst-free one-pot synthesis and characterization of some novel bis(2-benzothiazole) derivatives
Naeimi, Hossein,Tarazian, Reza
, p. 566 - 571 (2014)
A general method for preparation of benzothiazole derivatives including oxidative cyclization of the corresponding Schiff bases was reported. Herein, we have been synthesized a series of new acyclic-substituted bis(2- arylbenzothiazoles). Synthesis of analogs substituted in the benzothiazole ring was achieved via the direct condensation reaction of o-aminothiophenol with some of dialdehyde compounds under catalyst free in high yields. The structure of these products has been fully characterized by physical and spectroscopic data such as IR, 1H-NMR, 13C-NMR, UV-Vis, MS, and CHN analysis.
The amine complexes of aluminum hydride. V. Hydrido aluminum borohydride derivatives
Ruff, John K.
, p. 515 - 519 (1963)
A series of compounds H3-xAl(BH4)x·N(CH3) 3 (x = 1, 2, and 3) and H2-xAl(BH4)xN(CH3)2 (x = 1 and 2) were prepared by a metathetical reaction between LiBH4 and the corresponding chloro derivatives. Their properties and reactions with trimethylamine and mercuric chloride are discussed.
Ligand coordination sphere effect of Schiff base cis-dioxomolybdenum(VI) complexes in selective catalytic oxidation of alcohols
Liu, Haiwen,Zhuo, Zihan,Zhang, Yan,Wei, Hang,Zhang, Wenxin,Li, Tong,Mao, Zuodong,Wang, Weili
, p. 1253 - 1261 (2021/08/13)
Several cis-dioxomolybdenum(VI) complexes with Schiff bases-derived ligands were synthesized and fully characterized. The catalytic performances of these complexes were tested in the alcohol oxidation under solvent-free condition using H2O2 as oxidant giving high results. The influence of the oxygen, sulfur, and nitrogen atom within the coordination sphere around the molybdenum center was studied (S?>?N?>?O). From this study, we suggest that there exists a relationship between the electronegativity of the atom and the catalytic performance in alcohol oxidation.
