Synthesis of chitosan grafted with aminomethyl zinc phthalocyanine for photodynamic therapy

Chiral colorimetric sensor 4 has been synthesized, and the structure characterized by IR and 1H NMR spectroscopy, mass spectrometry, and elemental analysis. The chiral recognition of the receptor was studied by 1H NMR and UV-vis spectroscopy. The results of non-linear curve fitting indicate that the receptor 4 and l- or d-mandelate and alanine anions form a 1:1 stoichiometric complex. The obvious colour change of receptor 4 can be observed by the naked eye when the enantiomers of mandelate and alanine anions are added, which demonstrates that receptor 4 may be used as the colorimetric sensor for the two carboxylic anions.

Synthesis and cytotoxic activities of organometallic Ru(II) diamine complexes.

With the dwindling amount of fossil fuels in the world’s reserve is said to run out in the future. The use of alternative fuels such as hydrogen can be produced from renewable sources. One source is the use of first row transition metal complexes that can harness the power of the sun to reduce protons to hydrogen. In this thesis we investigated a well-known hydrogen evolution catalyst in a quest to understand the behavior of different oxidation states that occur during the catalytic cycle. In an attempt to synthesize a binuclear ruthenium(II) complex, [{Ru(phen)2}2{µmes(1,4-phO-Izphen)3}](PF6)4, as a possible photosensitizer for the production of hydrogen from the reduction of protons in various media. The expected product was not synthesized according to the reported procedure that was followed. The reaction was carried out in refluxing ethylene glycol due to low solubility of 2,4,6-trimethyl-1,3,5-tris(4oxymethyl-1-yl(1H-imidazo-2yl-[4,5-f][1,10]phenanthroline)phenyl)benzene in organic solvents such as acetonitrile, DMSO, and DMF. In the first attempt, two (2) equivalents of complex to one (1) equivalence of ligand was first used, which resulted in the formation of a trinuclear complex, [{Ru(phen)2}3{µ-mes(1,4-phO-Izphen)3}](PF6)6•CH3CN•10H2O, with a yield of 48%. In another procedure with 1.5 equivalences of the ruthenium(II) precursor to 1 equivalence of the ligand, [{Ru(phen)2}3{µ-mes(1,4-phOIzphen)3}](PF6)6•xH2O was isolated with a yield of 58%. The fomula of the trinuclear complex was ascertained by elemental analysis, ESI MS, UV-visible and 1H NMR spectroscopies, along with electrochemical studies. In another study [Co(dmgBF2)2(H2O)2] (where dmgBF2 = difluoroboryldimethylglyoximato) was reacted with triethylamine in either acetone or acetonitrile in an attempt to identify the products that were formed in situ during photocatalytic production of hydrogen when triethylamine was used as a sacrificial reductant. Techniques such as elemental analysis, ESI MS, and UV-visible spectroscopy were used in an attempt to characterize the resulting products from the respective solvents. Futher characterization of the unknown isolated product will be carried out in the near future. [Co(dmgBF2)2(H2O)2] was used to synthesize [Co(dmgBF2)2(H2O)(py)]•0.5(CH3)2CO in acetone. The formulation of [Co(dmgBF2)2(H2O)(py)]•0.5(CH3)2CO was confirmed by elemental analysis, high resolution ESI MS, and FT IR spectroscopy. Equilibrium studies carried out on [Co(dmgBF2)2(H2O)2] proved the formation of a monopyridine species, with formation constants, log K = 5.5, 5.1, 5.0, 4.4, and 3.1 in 2-butanone, dichloromethane, acetone, 1,2difluorobenzene/acetone (4:1, v/v), and acetonitrile, respectively, at 20 oC. In strongly coordinating solvents, such as acetonitrile, the magnitude of K is observed to be lower, and this phenomenon was also observed in the electrochemical studies and in the other spectroscopic studies as well. A larger formation constant, log K = 4.6 vs 3.1, as calculated for the pyridine coordinated to a…

Advances in supramolecular polymer chemistry : well-defined terpyridine-functionalized materials

Efficient synthesis of novel 1,10 phenanthroline-substituted imidazolium salts: Exploring their anticancer applications

Nanocomposites of iron oxide (Fe3O4) with a sulfonated polyaniline, poly(aniline‐co‐aminonaphthalenesulfonic acid) [SPAN(ANSA)], were synthesized through chemical oxidative copolymerization of aniline and 5‐amino‐2‐naphthalenesulfonic acid/1‐amino‐5‐naphthalenesulfonic acid in the presence of Fe3O4 nanoparticles. The nanocomposites [Fe3O4/SPAN(ANSA)‐NCs] were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X‐ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, elemental analysis, UV–visible spectroscopy, thermogravimetric analysis (TGA), superconductor quantum interference device (SQUID), and electrical conductivity measurements. The TEM images reveal that nanocrystalline Fe3O4 particles were homogeneously incorporated within the polymer matrix with the sizes in the range of 10–15 nm. XRD pattern reveals that pure Fe3O4 particles are having spinel structure, and nanocomposites are more crystalline in comparison to pristine polymers. Differential thermogravimetric (DTG) curves obtained through TGA informs that polymer chains in the composites have better thermal stability than that of the pristine copolymers. FTIR spectra provide information on the structure of the composites. The conductivity of the nanocomposites (∼ 0.5 S cm−1) is higher than that of pristine PANI (∼ 10−3 S cm−1). The charge transport behavior of the composites is explained through temperature difference of conductivity. The temperature dependence of conductivity fits with the quasi‐1D variable range hopping (quasi‐1D VRH) model. SQUID analysis reveals that the composites show ferromagnetic behavior at room temperature. The maximum saturation magnetization of the composite is 9.7 emu g−1. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

The tetraphenyl porphyrins (TPP) and metalloporphyrins such as CoTPP, NiTPP and ZnTPP were synthesized, purified and characterized by UV-Visible spectroscopy, IR spectroscopy, 1H NMR spectroscopy and elemental analysis. The results have been discussed in the light of magnetic susceptibility; diffuse reflectance spectroscopy (DRS), electron spin resonance (ESR), X-ray diffraction data and solar assisted photodegradation. The semi conducting properties of these porphyrins were employed for trapping the solar radiations for the photodegradation of azo dye such as Amido Black 10B at different pH conditions. This reaction was studied as a model reaction for finding the photoactivity of these compounds. Key words: Metalloporphyrins, metal organic semiconductors, photocatalytic activity, solar assisted photodegradation, amido black 10B.

Synthesis and characterization of telechelic phosphine oxide polyesters and cobalt(II) chloride complexes

Spectrometric techniques for elemental profile analysis associated with bitter pit in apples

Copper(II) and nickel(II) complexes with two new bis(thiosemicarbazone) ligands: Synthesis, characterization, X-ray crystal structures and their electrochemistry behavior

Facile Access to Polar-Functionalized Ultrahigh Molecular Weight Polyethylene at Ambient Conditions

Well defined and responsive amphiphilic block copolymers synthesized using TEMPO initiated thiol-ene reaction

New aromatic poly(amide-ester-imide) (PAEI) was prepared by phase transfer-catalyzed interfacial polycondensation of N,N′-(1,3,5,7-tetraoxo-5,7-dihydropyrrolo[3,4-f]isoindole-2,6(1H,3H)-diyl)bis(4 hydroxybenzamide) diol, with isophthaloyl chloride. The resulting PAEI was characterized by inherent viscosity measurements, solubility test, Fourier transform infrared (FT-IR), and 1H-NMR spectroscopy. Then, the PAEI was used as a polymer matrix for the preparation of PEAI/modified TiO2 nanocomposite (NC). In order to improve the dispersion of TiO2 nanoparticles in the polymer matrix, the surface of TiO2 nanoparticles was modified with N,N′-(pyromellitoyl)-bis-l-isoleucine diacid (DA). The obtained PAEI/DA-TiO2 NCs were characterized by FT-IR spectra, X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. Morphology study demonstrated that DA-TiO2 nanoparticles were dispersed homogeneously in the polymer matrix. The thermogravimetric analysis indicated an enhancement of the thermal stability of the NCs via increasing nanoparticles contents.

A new chromogenic receptor, 4-((2,4-dichlorophenyl)diazenyl)-2-(3-hydroxypropylimino)methyl)phenol, has been designed and synthesized for quantitative and low-cost detection of various biological anions and cations. The dye was characterized by elemental analyses, infrared, UV-visible spectroscopy, and NMR spectroscopy. The chemosensor showed visual changes towards anions, such as F– and H2PO4–, in DMSO and towards cations, such as Al3+, Cu2+, Fe3+, and Cr3+, in DMSO/water (9 : 1). The anion recognition property of the receptor via proton transfer was monitored by UV-visible titration and 1H NMR spectroscopy. The binding constant (Ka) and stoichiometry of the host–guest complexes formed were determined by the Benesi–Hildebrand (B–H) plot and Job's method, respectively.

A series of symmetrical tetradentate Schiff bases derived from substituted salicylaldehyde and ethylenediamine were prepared and characterized by elemental analysis, IR, UV-Visible and 1H NMR spectroscopy. The interaction of these bases with MnCl2 4H2O and CuCI2 2H2O have been studied, leading to the preparation of manganese(II) and copper(II) complexes. Microanalysis, molar conductance, IR, UV-Visible spectroscopy, magnetic measurements and ESR spectra have been used to elucidate the stucture of the resultant complexes The experimental data show that all the Schiff base Iigands N, N′-bis(2-hydroxybenzyl)ethylenediimine (H2L.1), N, N′-bis(2-hydroxyacetophenyl)ethylenediimine (H2L2) and N, N′-bis(2-hydroxypropiophenyi)ethylenediimine (H2L3) yield 1:1 compounds except for the ligand H2L2 which gave a 2:1 compound with manganese(II) The spectral studies support the binding of the Iigands with two N. and two O donor sites to the metal(II) ion, giving an arrangement of N2O2 donor groups Magnetic and ESR data indicate that the manganese(II) adopts a high spin configuration in the complexes studied and the covalent character of the metal-ligand bonding in the copper(II) complexes increases with the increasing electron donating effect of the ligand substituents R. The electrochemical behaviour of the manganese(II) and the copper(II) complexes was determined by cyclic voltammetry which shows that the chelate structure and electron donating effects of the ligand substituents are among the factors influencing the redox potentials of the complexes