Synthesis and Characterization of Mesostructured Materials
Catalysis and heterogeneous catalysts are essential to our present technology for the production and consumption of fuels, the manufacture and processing of chemical feedstocks and plastics [1,2]. It had been estimated that the introduction of this technology has permitted savings of more than 400 million barrels of oil each year [l]. Today, worldwide catalysts sales exceed $5.9 billion per year, and it has been estimated that catalysts generate fuels and chemicals worth $2.4 trillion annually, equivalent to half the U.S. Gross National Product [1,2]. [1]
Synthesis and Characterization of a Metallabenzyne
Although many metallabenzenes are known, complex 1 appears to be the first well-characterized example of a metallabenzyne. It has been synthesized by treatment of [OsCl2(PPh3)3] with an excess of HC≡CSiMe3 in wet benzene. The structure of the novel complex 1 was confirmed by single-crystal X-ray diffraction, which showed the six-membered ring to be essentially planar with a maximum deviation from the least-squares plane of 0.047 Å. [2]
Synthesis and characterization of carboxylated polysulfones
Polysulfone has been carboxylated, via a metalated intermediate, by reaction of a THF solution of polymer with n-butyllithium and then treatment with carbon dioxide. The polymer reactions with n-butyllithium were close to quantitative and did not require the use of a tertiary amine catalyst. A series of polymers ranging from 0.2 to 1.9 carboxyl groups per repeat unit was prepared by this method in the salt, acid and ester form. The structures of these polymer derivatives were characterized by 1H-NMR, 13C-NMR and IR. The glass transition temperatures and thermal stabilities were characterized by differential scanning calorimetry (DSC) and thermogravimetry (TG).[3]
Synthesis and Characterization of Polyaniline/Fe3O4 Magnetic Nanocomposite as Practical Approach for Fluoride Removal Process
In order that removal of excess fluoride from water a novel magnetic nanocomposite has been synthesized. Magnetic nanoparticles were successfully synthesized by chemical co-precipitation method. Afterwards, polyaniline containing magnetic nanoparticles were prepared by in-situ doping polymerization in the presence of HCl. The polyaniline/Fe3O4 magnetic nanocomposite has been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Vibrating sample magnetometer (VSM) was also used for magnetization characterization of polyaniline/Fe3O4 nanocomposite at room temperature. The conductivity and magnetic properties of the polyaniline containing Fe3O4 nanoparticles showed that the samples have a novel conductivity and a superparamagnetic behavior. Subsequently, the ability of the adsorbent to remove fluoride from water was demonstrated in a batch sorption mode. Results reveal that the adsorption is rapid and the adsorbent has high affinity for fluoride, which depends on solution pH and adsorbent dose.[4]
Synthesis and Characterization of Bisdithiocarbamates from Weak Nitrogen Bases and Its Metal Complexes
In the present study, disodium salts of bisdithiocarbamates have been prepared from urea, thiourea, dithiooxamide and 1,3-diaminopropanewith carbon disulfide under strong alkaline medium of a sodium hydroxide solution. All ligands possessed good chelating ability for various metal ions. Metal complexes of urea bisdithiocarbamates was synthesized with Co (II), Ni (II), Zn (II), and Pb(II). The nature of metal complexes was amorphous and solid. The prepared ligands and complexes were characterized by elemental analysis, electronic, infrared (IR) spectroscopy, conductivity measurements, magnetic measurements and thermogravimetric analysis (TGA). Electronic spectra and magnetic measurements indicate that the complexes have contained octahedral geometry.[5]
Reference
[1] Biz, S. and Occelli, M.L., 1998. Synthesis and characterization of mesostructured materials. Catalysis Reviews, 40(3), pp.329-407.
[2] Wen, T.B., Zhou, Z.Y. and Jia, G., 2001. Synthesis and characterization of a metallabenzyne. Angewandte Chemie International Edition, 40(10), pp.1951-1954.
[3] Guiver, M.D., Croteau, S., Hazlett, J.D. and Kutowy, O., 1990. Synthesis and characterization of carboxylated polysulfones. British polymer journal, 23(1‐2), pp.29-39.
[4] Jokar, M., Foroutani, R., Safaralizadeh, M.H. and Farhadi, K., 2014. Synthesis and characterization of polyaniline/Fe3O4 magnetic nanocomposite as practical approach for fluoride removal process. Annual Research & Review in Biology, pp.3262-3273.
[5] Tiwari, S., Reddy, K.V., Bajpai, A., Khare, K. and Nagaraju, V., 2015. Synthesis and characterization of bisdithiocarbamates from weak nitrogen bases and its metal complexes. International Research Journal of Pure and Applied Chemistry, pp.78-91.
