A novel Schiff-base, [9-(2-Chloro-ethyl)-9H-carbazol-3-yl-methylene]-(9-ethyl-9H-carbazol-3-yl)-amine (CECA) was designed and synthesized, which was highly selective and sensitive for the detection of Al3+ by colorimetric, ultraviolet absorption and fluorescence three-signal methods. The detecti...

Treatment of R2Si(CC-SiMe3)2 [1a (Me), 1b (Ph)] with HB(C6F5)2 at low temperature (253 K (a), 273 K (b)) gives the –B(C6F5)2 substituted silacyclobutene products (4a,b) under kinetic control. Upon warming to room temperature they disappear to form the thermodynamically favoured isomeric silole ...

(Perhaloaryl)dimethylsilanes undergo a cleavage reaction with organolithium compounds, using very moderate conditions, to produce (perhaloaryl)lithium derivatives in good yield. The corresponding trimethylsilyl compounds [except for 2,5-bis(trimethylsilyl)dichlorothiophene] and phenyldimethylsi...

Bis(pentafluorophenyl)methylsilane (I) reacts with primary alkyllithium and Grignard reagents to give high yields of the pentafluorophenylmetallic species. The influence of steric factors upon the course of the reactions with a series of RLi and RMgX compounds including PhMgBr, i-PrMgBr and t-Bu...

Four heterocyclic methacrylates were investigated with respect to their loss tangent and activation energy using a dynamic mechanical thermal analyser over a limited frequency range of 0.033 to 90 Hz. The linear regression lines obtained showed an Arrhenius-type relationship between transition t...

Efficient liquefaction of lignin has been realized by using 1-methyl-3-(3-sulfopropyl)-imidazolium hydrogensulfate [C3SO3HMIM][HSO4] ionic liquid (IL) as catalyst (Green Chem. 18 (2016) 4098–4108). To gain insight into the mechanism of the catalytic cleavage of the dominant linkage (β−O−4 link...

Reaction of hexaamminecobalt(III) chloride with the silver salt of methanesulphonic acid in aqueous medium (1:3 molar ratio) forms hexaamminecobalt(III) methanesulphonate, [Co(NH3)6](CH3SO3)3, in high yield. This cobalt(III) complex has been characterized by spectroscopic techniques (UV/visible,...

The orange coloured single crystals of bis-(hexaamminecobalt(III)) tris-(hydrogenarsenate) tetrahydrate, [Co(NH3)6]2(HAsO4)3·4H2O, have been prepared by reacting aqueous solutions of hexaamminecobalt(III) chloride with disodium hydrogenarsenate in 1:1 molar ratio. The title complex salt was cha...

Using cationic dyes, such as hexaamminecobalt trichloride (CoHex), is a popular method for measuring clay minerals' cation exchange capacity (CEC), because a short single extraction followed by colorimetric measurements is sufficient to accurately measure the CEC. In addition, the analysis ...

The reaction of hexaamminecobalt(III)chloride with sodium salt of methanesulphonic acid in aqueous medium (1:3 molar ratio) leads to formation of hexaamminecobalt(III)chloride dimethanelsulphonate, [Co(NH3)6]Cl(CH3SO3)2. This cobalt(III) complex has been characterized by elemental analyses and s...

The compounds hexaamminecobalt(III) chloride and tris(2,4-pentanediono)cobalt(III) have been prepared. The compounds have octahedral structures. The initial decomposition temperature of the compounds has been obtained by thermogravimetry. The performance of the compounds as colouring materials f...

The work comprises results of the studies on the mechanism and kinetics of hexaamminecobalt(III) reduction in ammonia-chloride solutions at pH 9.5. The studies were preceded by the thermodynamic analysis of the electrolyte. Electrolyte stability was determined by UV–vis absorbance measurements....

A reddish orange coloured crystalline solid of hexaamminecobalt(III) chloride di(para-nitrobenzoate) was obtained when hexaamminecobalt(III) chloride was reacted with the sodium salt of para-nitrobenzoic acid (1:3 molar ratio) in hot aqueous medium. This cobalt(III) complex salt has been charact...

In an effort to utilize [Co(NH3)6]3+cation as a new host for carboxylate ions, orange coloured crystalline solids of composition [Co(NH3)6]Cl(C8H5O4)2·3H2O (1) and Na[Co(NH3)6](C7H5O2)4·H2O (2) were obtained by reacting hot aqueous solutions of hexaamminecobalt(III) chloride with potassium hyd...

BackgroundThe tripartite efflux pump AcrAB-TolC in E. coli is involved in drug resistance by transporting antibiotics out of the cell. The outer membrane protein TolC can be blocked by various cations, including hexaamminecobalt, thereby TolC represents a potential target for reducing antimicrob...

In an effort to utilize the [Co(NH3)6]3+ cation as a new anion receptor (binding agent) for dihydroxy dicarboxylate anion i.e., tartrate, orange single crystals of hexaamminecobalt(III) chloride (R,R)-tartrate monohydrate, [Co(NH3)6]Cl(C4H4O6)·H2O, were obtained by reacting hexaamminecobalt(III...

Peach/yellow coloured solids of composition [Co(NH3)6]X·SiF6·nH2O, where X = Cl, Br, I and NO3 were obtained directly by reacting [Co(NH3)6]X3 with Na2SiF6 in 1:1 molar ratio in hot aqueous medium. These hexaamminecobalt(III) complex salts have been characterized by elemental analyses and spec...

Thermal decomposition reactions of hexaamminecobalt(III) chloride in the presence of anion salts KY (Y = Cl−, Br−, I−, CN−, SCN−, OH−) are investigated, mainly by gas chromatographic, infrared spectroscopic and X-ray diffraction methods. Kinetic parameters are calculated. The deammine activation...

By employing tetrabutylammonium fluoride (TBAF) as a catalyst, the various carboxylative cyclizations of the propargylic amines having internal alkynes with CO2 proceeded to afford the corresponding 2-oxazolidinones. In this case, it was also found that the generated 2-oxazolidinones were tautom...

Cyclic voltammograms for reduction of 4-(bromomethyl)-2-oxo-2H-chromen-7-yl acetate (or 7-acetoxy-4-bromomethylcoumarin) (1) at carbon cathodes in either dimethylformamide (DMF) containing tetramethylammonium tetrafluoroborate (TMABF4) or acetonitrile (CH3CN) containing TMABF4 show four irrevers...