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Design, synthesis, spectroscopic characterizations, in vitro pancreatic lipase as well as tyrosinase inhibition evaluations and in silico analysis of novel aryl sulfonatenaphthalene hybrids

Copolymerization and homopolymerization of benzyl methacrylate (BMA) and ethyl methacrylate (EMA) by the atom transfer radical polymerization method (ATRP) were performed at 90°C. ATRP of BMA was also carried out at 80, 100, and 110°C. The number-average molecular weight (M n ) and polydispersities decreased with temperature. When BMA units increased in the copolymer system, the M n values and polydispersities decreased (1.63 Ͻ M w /M n Ͻ 1.13). The homopolymers and poly(BMAco-EMA) were characterized by Fourier transform infrared (FTIR), 1 H and 13 C NMR, and gel permeation chromatography (GPC) techniques. The compositions of the copolymers were calculated from 1 H NMR spectra. For the atom transfer radical copolymerization system, their monomer reactivity ratios were obtained by using the Kelen-Tü dös equation, as r 1 ϭ 0.812, r 2 ϭ 1.162 (r 1 is the monomer reactivity ratio of BMA). The initial decomposition temperatures of the resultant copolymers decrease with an increasing mol fraction of BMA, which indicates that the heat resistance of the copolymer has been improved by decreasing the BMA units. Blends of poly(BMA) and poly(EMA) obtained via the ATRP method have been prepared by casting films from a dichlorormethane solution. The blends have been characterized by differential scanning calorimetry and thermogravimetry. The measurements were comparable with those of copolymers synthesized.

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The oxidative polycondensation reaction conditions of 2-(2-hydroxybenzylideneamino)-6-phenyl-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carbonitrile were examined. The magnitude of the reflectance of the polymer decreases sharply with increasing of wavelength up to 524 nm, then reflectance of the polymer increases slowly with increasing of wavelength. The refractive index values of the polymer vary from 1.474 to 2.350. The E p and E d values of the polymer were found to be 4.56 and 7.068 eV, respectively. Absorption coefficient K of the polymer is of the order 817.062-1434.77 m 21 . Angle values of incidence and refraction of the polymer vary from 57.36 to 66.958 and from 23.05 to 32.658, respectively. The film-phase thickness of the polymer increases with increasing photon energy. The thickness, d, of the polymer was of the order 439.3-4184.7 Å for 190 and 1100 nm, respectively. The real part of dielectric constant of the polymer decreases slowly with increasing of frequency up to about 600 THz, then the real part of dielectric constant of the polymer increases sharply with increasing of frequency. The real and imaginary parts of dielectric constant of the polymer vary from 2.17 to 5.52 and from 5.81 3 10 25 to 3.58 3 10 24 , respectively. Finally, polymer was tested for antibacterial activities against some bacteria. POLYM. ENG. SCI., 52:1581-