Oriented polycrystalline films of methyltin trichloride were grown from the melt between both alkali halide and polyethylene windows. The polarized infrared spectra from 3500–40 cm−1 of these films were studied at about 25 K for the films grown between alkali halide windows and at liquid nitrog...

Methyltins were occasionally observed in some natural waters. The nature of a marine sediment determines its organotin burdens. Mono- and dimethyltin compounds were found in polluted marine sediments whereas non-polluted, oxiccoastal sediments contained primarily trimethyltin. The net methylatio...

A novel on-line coupled HPLC–hydride generation (HG)–ICP/MS system was developed for rapid, direct and sensitive speciation of methyltins in seawater without any pretreatment step. Methyltin compounds were separated by reversed phase HPLC, and then on-line reacted with potassium borohydride an...

The methyltins, methyltin 2-ethylhexyl mercaptoacetate and methyltin-2-mercaptoethyloleate sulfide, are used as heat stabilizers in rigid PVC. The degradation products monomethyltintrichloride (MMTTC) and dimethyltindichloride (DMTDC) may leach from the PVC, and enter the environment. A risk ass...

The photodegradation of methyltins, as environmental pollutants, has scarcely been studied so far because of the shortage of rapid and sensitive speciation methods, even though they have very simple structures. The photodegradation of monomethyltin trichloride (MMT), dimethyltin dichloride (DMT)...

A method for the determination of methyltin compounds in human urine samples was developed using headspace solid-phase microextration (HS-SPME) coupled with gas chromatographic separation and flame photometric detection. Three methyltin compounds, monomethyltin (MMT), dimethyltin (DMT), and trim...

The concentrations of seven organotin compounds (OTCs) were determined seasonally in 22 sediment samples (brackish, freshwater and shrimp pond sediments) in South Hangzhou Bay, China. For the brackish and freshwater sediments, methyltins of up to 43.0 ng Sn g−1 dw showed no significant variation...

The reaction of dimethyltin dichloride with four substituted 1, 10- phenanthroline has been studied. The reactions of dimethyltin dichloride with 5-methyl-1,10-phenanthroline (Mephen); 5,6-dimethyl-1,10-phenanthroline (Me2phen); 5-nitro-1,10-phenanthroline (NO2phen); 5-chloro-1,10-phenanthroline...

Equilibrium studies in aqueous solution are reported for dimethyltin(IV) complexes of the zwitterionic buffers “Good’s buffer”, such as Mes and Mops (L). Stoichiometry and stability constants for the complexes formed were determined at different temperature and ionic strength 0.1 M NaNO3. The...

Medium effect and equilibrium studies in aqueous solution are reported for dimethyltin(IV) complexes such as 2-(N-morpholino) ethanesulfonic (Mes) and 3-(N-morpholino) propanesulfonic (Mops) acid. Stoichiometries and stability constants of the complexes formed were determined at different temper...

The supramolecular complexes (SC) of the type [Me2SnCl2L], L = 2,2′-bipyridine (2,2′-bpy), SC 1, 4,4′-bipyridine (4,4′-bpy), SC 2, and (1,10-phenanthroline), SC 3, have been synthesized and structurally characterized by elemental analysis, FT-IR, UV–Vis, 1H and 13C NMR spectra and X-ray sin...

A series of novel bicyclodioxazastannone derived from ONO Schiff base ligands prepared from diazenylaryl functionalized 2-hydroxybenzaldehydes and α or β-amino acetates, viz., [Me2Sn(L1)]2 (1), [Me2Sn(L2)]2 (2), [Me2Sn(L3)(MeOH)]2 (3), [Me2Sn(L4)]n (4), [Me2Sn(L5)]n⋅nH2O (5), [Me2SnL6)]2 (6), ...

Sensing of pyrophosphate anion (PPi) in the presence of nucleotide triphosphates allows the real time monitoring of the polymerase chain reaction. To get a deeper understanding of the factors involved in PPi/nucleotide triphosphate discrimination, a detailed study on the performance of a dimethy...

UV–vis and fluorescence spectra of 2-[2-(4-cyclaminophenyl)ethen-1-yl] benzothiazoles 1 and their N-allylbenzothiazolium bromides 2 have been measured and interpreted. The substitution and solvent effects on electronic structure and spectra have been investigated. The benzothiazolium salts subs...

We prepared conjugated polymer nano-ellipsoids (CPNs) via emulsification of chloroform phase using the octanoic acid (OA) in dimethyl formamide (DMF), followed by the removal of chloroform by heating. The resulting CPN DMF solutions were thoroughly mixed with polyurethane (PU) DMF solutions to f...

Conjugated polymer nanowires have recently attracted attention as new organic photocatalysts with improved photoexcited charge-carrier lifetime capable of efficient energy harvesting from sunlight. However, most methods to prepare the nanowires have focused on crystalline conjugated polymers, th...

1,2-Diaza-1,3-butadienes have been obtained from readily available 3-hydroxy-2-arylhydrazonopropanoates under various reaction conditions including pyrolysis, dehydration under Mitsunobu conditions or with acetic anhydride or acetic acid. According to their method of synthesis these 1,2-diaza-1,...

Dihydropyran-2-one possessing a sulfamate moiety at the 4-position of the thiophenyl ring were designed to reach S3′ pocket of the HIV protease. Synthetic routes for the preparation of thiotosylates possessing 3-(2-t-butyl-5-methyl-4-sulfamate) phenylthio moiety were established. SAR of various...

Treatment of 7-bromo-5-(2′-chloro)phenyl-3-hydroxy-1,2-dihydro-3H-1,4-benzodiazepin-2-one (1) with methyl or hexyl tosylate resulted in 7-bromo-5-(2′-chloro)phenyl-3-hydroxy-1-methyl-1,2-dihydro-3H-1,4-benzodiazepin-2-one (2) and 7-bromo-5-(2′-chloro)phenyl-1-hexyl-1,2,4,5-tetrahydro-3H-1,4-b...

An efficient and regioselective synthesis of functionalized benzenes via the cascade reactions of 1,2-allenic ketones with 4-sulfonyl crotonates under mild reaction conditions has been established. Mechanistically, the formation of the title compounds involves a cascade procedure consisting of a...