# FTIR

## Quantum-Chemical Modeling of Hydrosilylation Reaction of Triethoxysilane to Divinylbenzene

Hydrosilylation of triethoxysilane with the mixture of ortho- and para-divinylbenzene in the presen¬ce of Karstedt’s catalyst has been carried out and the corresponding product triethoxy(vinylphenethyl)silane have been obtained. The structure and composition of the obtained product were proved by means of determining molecular mass, molecular refraction, and 1H and 13C NMR spectra data. It was found that the addition reaction proceeds both in ortho-position as well as in para-position.

## The mathematical fractional modeling of TiO_2 nanopowder synthesis by sol–gel method at low temperature

Titanium dioxide is a compound of oxygen and titanium with the formula TiO$_2$ present in nature and manufactured on an industrial scale.  It is used in several fields and applications such as cosmetics, paint, food, photocatalyst, electrodes in lithium batteries, dye solar cells (DSSC), biosensors, etc., given its importance and its various fields of application, there are several methods of synthesis of TiO$_2$ such as the sol–gel method widely used to obtain nanoparticles.  In our study, on the one hand we synthesized titanium dioxide nanopowders crystallized in the

## ZnCl2-Catalyzed Four-Component Domino Reaction for One-Pot Eco-Safe and Convenient Synthesis of Polyfunctionalized Dihydro-2-oxopyrroles at Ambient Temperature

In this study, ZnCl2 was applied as an environmentally friendly and efficient Lewis acid catalyst for the one-pot four-component synthesis of polysubstituted dihydro-2-oxopyrroles from the reaction between dialkyl acetylenedicarboxylate, formaldehyde and amines (aromatic and aliphatic) at ambient temperature. This methodology has a number of advantages such as use of inexpensive, eco-safety of catalyst, short reaction times, high yields, easy work-up (just simple filtration), and simplicity of operation.

## Structural Properties of Polythiophene Doped with FeCl3

Polythiophene is chemically synthesized and doped with FeCl3 for 2.5, 5 and 10 h. For structural investigation all samples have been characterized using different techniques. The results of elemental analysis show that with the increase of doping duration the Fe content increases while the S content decreases. FTIR spectrum reveals the complex formation between FeCl3 and polythiophene. UV-Visible results have been used to calculate band gap energy.

## Studies on the Effect of Doping Agent on the Structure of Polyaniline

Polyaniline (PANI) doped with hydrochloric acid (HCl), sulpharic acid (H2SO4) and formic acid (HCOOH) was synthesized by a chemical oxidative polymerization technique. The oxidizing agent used for this method is potassium dichromate. The polymer products were characterized by FTIR and UV-visible spectroscopy. The FTIR results showed that the doping degree of PANI-HCOOH is the greatest one. A successful doping of HCOOH in PANI was observed in UV-visible spectroscopy. Three steps decomposition observed from the thermo gravimetric analysis (TGA).