Investigation of the Electronic and pH-Sensing properties of Hydroxyl-Functionalized Imine-Linked Polymers via the UV-vis Absorption Spectra and the Density Functional Theory (DFT) Calculations
| Autor: | Muna M. Al Amelat, Mohammed I. Alomari, Suha S. Altarawneh, Ibtesam Y. Alja'afreh, Alaa M. Almaabreh |
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| Rok vydání: | 2017 |
| Předmět: |
conformation
Absorption spectroscopy Band gap Substituent UV-vis 02 engineering and technology 010402 general chemistry Photochemistry DFT 01 natural sciences chemistry.chemical_compound Ultraviolet visible spectroscopy Computational chemistry Functionalization QD1-999 chemistry.chemical_classification Length of conjugation Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry Monomer chemistry Sensing Density functional theory Absorption (chemistry) 0210 nano-technology |
| Zdroj: | Journal of Pure and Applied Chemistry Research, Vol 6, Iss 1, Pp 34-48 (2017) |
| ISSN: | 2541-0733 2302-4690 |
| Popis: | In this report, a synergetic computational and experimental studies were demonstrated on examples of poly-imine polymers; P(PI-IPI) and P(PIOH-IPI) to explore the role of hydroxyl substituent on their sensing and electronic properties. The polymer P(PIOH-IPI) bearing the OH-group on the ortho -position to the imine-bond, while the structure of the polymer P(PI-IPI) reveal the imine-bond only. The sensing property of the polymers was investigated via the UV-vis absorption in different solvents, acidic and basic solutions. Both polymers have shown significant sensing behavior in the acidic medium, while unpronounced behavior was noticed in the case of the polymer P(PI-IPI) in basic medium. Upon the incorporation of the OH-group, the polymer P(PIOH-IPI) has indistinguishable sensing behavior, a similar blue-shift in the acidic and basic medium, which can be attributed to the presence and the position of OH-group. The optical band gap of the polymers was determined experimentally and theoretically from the UV-vis absorption spectra and DFT calculations in the DMSO solvent. Other factors that affect the band gap values such as the structural conformation and length of conjugation were explored theoretically. In general, as the length of the optimized chain increased, the spectrum is red-shifted and the band gap decreased, which is attributed to the possible loss of chain planarity and conjugation beyond the monomer structure. Interestingly, the UV-vis spectra of the monomer-optimized structures were in a good match with the experimental UV-vis spectra. However, the band gap difference can be attributed to the method of band gap determination. |
| Databáze: | OpenAIRE |
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