Aryl chlorides bearing electron withdrawing groups were successfully coupled with arylboronic acids (Suzuki reaction). Two palladium catalyst ligands, tricyclohexylphosphine (PCy3) and 1,3-bis(diphenylphosphino)propane (dppp), were found to be superior in catalyzing the reaction.
A series of planar Ni(II) dithiolenes derived of maleonitriledithiol (mnt), benzene-1,2-dithiol (bdt) and toluene-3,4-dithiol (tdt) with bidentate P,P-ligands (dppe = 1,2-bis(diphenylphosphino)ethane, dppp = 1,3-bis(diphenylphosphino)propane, dppb = 1,4-bis(diphenylphosphino)butane, dpppn = 1,5-...
Four new binuclear nickel(II) metallates 1–4 were synthesized from the reaction between NiCl2·6H2O, 1,3-bis(diphenylphosphino)propane and [H2-(MSal-Rtsc)], where R = H, CH3, C2H5, C6H5, MSal = 3-methoxysalicylaldehyde, tsc = thiosemicarbazone. The complexes were characterized by various spectr...
[Ni(mdtc)(1,3-dppp)]ClO4 (1), and [Ni(mdtc)(1,4-dppb))ClO4 (2) [(mdtc−=4-morpholinecarbodithioato anion, 1,3-dppp=1,3-bis(diphenylphosphino)propane, 1,4-dppb=1,4-bis(diphenylphosphino)butane)] have been prepared from their parent dithiocarbamate. The planar complexes were characterized by electr...
Publisher SummaryNative hemoglobins contain one histidine coordinated to the iron on the proximal side of the heme and another histidine in the ligand pocket on the distal side of the heme. Oxygen located in this pocket in oxyhemoglobin can be replaced by other neutral ligands, such as carbon mo...
Two procedures for analyzing overlapping optical spectra of mixtures of pyridine hemochromes are described, and extinction coefficients of pyridine hemochromes are provided for use with these methods. In the first procedure, absorbance is measured at a number of wavelengths equal to the number o...
Perchlorate (ClO4-) is a contaminant of concern in groundwater and drinking water. In the presence of a suitable electron donor, perchlorate can be reduced to non-toxic chloride via either biotic or abiotic mechanisms. The objective of this study was to evaluate a variety of amendments (Emulsifi...
We report on the presence of perchlorate in the settleable dust of Malta, a small central Mediterranean island. Both dust fall collected directly as it precipitated from atmosphere over a period of one month and deposited indoor dust from domestic residences were studied. Perchlorate was determi...
Nitrates and perchlorates are present both on Earth and Mars. In the Martian environment perchlorates dominate over nitrates whereas on Earth is contrariwise. This implies that the mechanisms responsible for their formation are different for both planets. The chemical elements required for their...
Perchlorate is considered a rapidly spreading environmental pollutant. In Israel, it has been found at high concentrations in the vadose zone (up to 30,000 mg/L) and groundwater (up to 800 mg/L) underlying former industrial waste ponds. A perchlorate-reduction method that utilizes the high degra...
Calcium perchlorate (Ca(ClO4)2) is a highly deliquescent salt that may exist on the surface of present-day Mars; however, its water uptake properties have not been well characterized at temperatures and relative humidity conditions relevant to Mars. Here, we quantify the deliquescent relative hu...
Layers of organic dye pigments dispersed in poly(vinyl butyral) can be used as heterogeneous sensitizers for the photopolymerization of trimethylolpropane triacrylate. Reactions of the bulk monomer with different 3, 4, 9, 10-perylenetetracarboxylic diimides and copper phthalocyanine were studied...
A new polymeric monolith was prepared in stainless-steel column and fused-silica capillary, respectively, by atom transfer radical polymerization technique. In the polymerization, triallyl isocyanurate (TAIC) was used as the functional monomer; trimethylolpropane triacrylate (TMPTA) as the cross...
In order to improve its dispersibility and preserve its activity, nano-aluminum was encapsulated with poly(trimethylolpropane triacrylate) (PTMPTA) by in situ solution polymerization. The affecting factors of the conversion of monomer (CM), percentage of grafting (PG) and grafting efficiency (GE...
A kinetic model based on method of moments, balance of species and sequences and numerical fractionation was developed for acrylic acid – TMPTA copolymerization. Solution copolymerizations of acrylic acid with trimethylolpropane triacrylate (TMPTA), initiated by sodium persulfate, were carried ...
Poly(trimethylolpropane triacrylate)/flaky aluminum composite particle was prepared by in situ polymerization in order to improve the corrosion resistance and adhesive property of aluminum pigments. The effect of monomer concentration, initiator concentration and feeding mode on the conversion, ...
Using an in-situ polymerization method, poly (methyl methacrylate) (PMMA) cross-linked by trimethylolpropane triacrylate (TMPTA) was embedded with nanosilica, aluminum oxide, or modified montmorillonite to produce various cross-linked nanocomposites. The same three nanofillers were also embedded...
Phase separation of trimethylolpropanetriacrylate/poly(styrene-co-methylmethacrylate) induced by UV-irradiation (photo-PIPS) has been studied. Three poly(St-co-MMA) with St:MMA monomer ratio of 25:75, 50:50 and 75:25 were synthesized with average molecular weight of Mw ≈ 5 × 104 and average Tg...
Trimethylolpropane triacrylate (TMPTA) is a multifunctional monomer with industrial applications. To determine the carcinogenic potential, male and female F344/N rats and B6C3F1/N mice were administered TMPTA (0, 0.3, 1.0, or 3.0 mg/kg) in acetone dermally for 2 years. There were no differences ...
Effect of molecular weight of a thermoplastic copolymer on final morphology of polymerization induced phase separation of trimethylolpropane triacrylate/copolymer blends have been studied. Two acrylate copolymers, ACHM and ACLM, mainly based on methyl methacrylate, butyl acrylate and styrene wer...
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