28308-00-1Relevant academic research and scientific papers
Synthesis and characterization of highly conductive charge-transfer complexes using positron annihilation spectroscopy
Adam, Abdel Majid A.,Refat, Moamen S.,Sharshar,Heiba
, p. 458 - 477 (2012)
Molecular charge-transfer complexes of the tetramethylethylenediamine (TMEDA) with picric acid (Pi-OH), benzene-1,4-diol (QL), tin(IV) tetrachloride (SnCl4), iodine, bromine, and zinc chloride (ZnCl2) have been synthesized and investigated by elemental and thermal analysis, electronic, infrared, Raman and proton-NMR, energy-dispersive X-ray spectroscopy, X-ray powder diffraction and positron annihilation lifetime spectroscopy, and scanning electron microscopy. In this work, three types of acceptors π-acceptors (Pi-OH and QL), σ-acceptors (iodine and bromine), and vacant orbital acceptors (SnCl4 and ZnCl2) were covered. The results of elemental analysis indicated that the CT complexes were formed with ratios 1:1 and 1:2 for QL, SnCl4, and ZnCl2 acceptors and iodine, Pi-OH, and Br2 acceptors, respectively. The type of chelating between the TMEDA donor and the mentioned acceptors depends upon the behavior of both items. The positron annihilation lifetime parameters were found to be dependent on the structure, electronic configuration, and the power of acceptors. The correlation between these parameters and the molecular weight and biological activities of studied complexes was also observed. Regarding the electrical properties, the AC conductivity and the dielectric coefficients were measured as a function of frequency at room temperature. The TMEDA charge-transfer complexes were screened against antibacterial (Escherichia coli, Staphylococcus aureus, Bacillus subtilis, and Pseudomonas aeruginosa) and antifungal (Aspergillus flavus and Candida albicans) activities.
“Snapshot” Trapping of Multiple Transient Azolyllithiums in Batch
Feng, Yuxuan,Inoue, Kengo,Mori, Atsunori,Okano, Kentaro
supporting information, (2021/06/28)
Recent developments in flow microreactor technology have allowed the use of transient organolithium compounds that cannot be realized in a batch reactor. However, trapping the transient aryllithiums in a “halogen dance” is still challenging. Herein is reported the trapping of such short-lived azolyllithiums in a batch reactor by developing a finely tuned in situ zincation using zinc halide diamine complexes. The reaction rate is controlled by the appropriate choice of diamine ligand. The reaction is operationally simple and can be performed at 0 °C with high reproducibility on a multigram scale. This method was applicable to a wide range of brominated azoles allowing deprotonative functionalization, which was used for the concise divergent syntheses of both constitutional isomers of biologically active azoles.
Structural Characterization and Unique Catalytic Performance of Silyl-Group-Substituted Geminal Dichromiomethane Complexes Stabilized with a Diamine Ligand
Murai, Masahito,Taniguchi, Ryuji,Hosokawa, Naoki,Nishida, Yusuke,Mimachi, Hiroko,Oshiki, Toshiyuki,Takai, Kazuhiko
supporting information, p. 13184 - 13192 (2017/09/26)
Stabilization by a silyl group on the methylene carbon and a diamine ligand led to the isolation of gem-dichromiomethane species. X-ray crystallography confirmed the identity of the structure of this rare example of reactive gem-dimetalloalkane species. T
Group 12 metal monoselenocarboxylates: Synthesis, characterization, structure and their transformation to metal selenide (MSe; M = Zn, Cd, Hg) nanoparticles
Kedarnath, Gotluru,Kumbhare, Liladhar B.,Jain, Vimal K.,Phadnis, Prasad P.,Nethaji, Munirathinam
, p. 2714 - 2718 (2007/10/03)
Reactions of [MCl2(tmeda)] with potassium salts of monoselenocarboxylic acids gave complexes of the general formula [M(SeCOR) 2(tmeda)] (M = Zn, Cd; R = Ph, Tol; Tol = C6H 4-p-CH3; tmeda = Me2NCH2CH 2NMe2). The analogous mercury complexes were unstable at room temperature and afforded HgSe nanoparticles during the course of reaction. All the complexes were characterized by elemental analysis, IR, UV-vis, NMR (1H, 13C, 77Se, 113Cd) data. The X-ray structural analysis of [Cd(SeCOPh)2(tmeda)] revealed that the complex is a discrete monomer having an approximate tetrahedral coordination environment around the central metal atom with monodentate (Se-bonded) selenocarboxylates. Thermal behavior of these complexes was studied by TG analysis. Pyrolysis in a furnace or in HDA (hexadecylamine) gave MSe nanoparticles, which were characterized by XRD, EDAX, SEM and absorption spectroscopy. The Royal Society of Chemistry 2006.
A new allotrope of elemental sulfur: Convenient preparation of cyclo-S14 from S8
Steudel, Ralf,Schumann, Oliver,Buschmann, Juergen,Luger, Peter
, p. 2377 - 2378 (2007/10/03)
Three simple steps lead from S8 to cyclo-S14, which is stable at 20°C. The final synthetic step [Eq. (a)] provides the title compound, which was characterized spectroscopically and by X-ray structure analysis. Formally, the structure of S14 is derived by insertion of an S2 unit into S12. tmeda = N,N,N',N'-tetramethylethyl-enediamine.
A bimetallic tantalum-zinc complex with an ancillary aryldiamine ligand as precursor for a reactive alkylidyne species: Alkylidyne-mediated C-H activation and a palladium-mediated alkylidyne functionalization
Abbenhuis, Hendrikus C. L.,Feiken, Nantko,Haarman, Henk F.,Grove, David M.,Horn, Ernst,Spek, Anthony L.,Pfeffer, Michel,Van Koten, Gerard
, p. 2227 - 2235 (2008/10/08)
The 1:1 reaction of TaCl2{C6H3(CH2NMe2) 2-2,6}(=CH-t-Bu) with neopentylzinc chloride affords the bimetallic complex TaCl2{C6H3(CH2NMe2
