Synthesis, Crystal Structures, and Spectroscopic Characterization of Bis-aldehyde Monomers and Their Electrically Conductive Pristine Polyazomethines

Document identifier: oai:DiVA.org:ltu-75995
Access full text here:10.3390/polym11091498
Keyword: Natural Sciences, Chemical Sciences, Polymer Chemistry, Naturvetenskap, Kemi, Polymerkemi, Physical Chemistry, Fysikalisk kemi, Polyazomethines, Single crystals, Bis-aldehydes, Spectroscopic characterization, Conductivity, Poly(Schiff base)s, Chemistry of Interfaces, Gränsytors kemi
Publication year: 2019
Abstract:

Bis-aldehyde monomers 4-(4′-formyl-phenoxy)benzaldehyde (3a), 3-methoxy-4-(4′-formyl-phenoxy)benzaldehyde (3b), and 3-ethoxy-4-(4′-formyl-phenoxy)benzaldehyde (3c) were synthesized by etherification of 4-fluorobenzaldehyde (1) with 4-hydroxybenzaldehyde (2a), 3-methoxy-4-hydroxybenzaldehyde (2b), and 3-ethoxy-4-hydroxybenzaldehyde (2c), respectively. Each monomer was polymerized with p-phenylenediamine and 4,4′-diaminodiphenyl ether to yield six poly(azomethine)s. Single crystal X-ray diffraction structures of 3b and 3c were determined. The structural characterization of the monomers and poly(azomethine)s was performed by FT-IR and NMR spectroscopic techniques and elemental analysis. Physicochemical properties of polymers were investigated by powder X-ray diffraction, thermogravimetric analysis (TGA), viscometry, UV–vis, spectroscopy and photoluminescence. These polymers were subjected to electrical conductivity measurements by the four-probe method, and their conductivities were found to be in the range 4.0 × 10−5 to 6.4 × 10−5 Scm−1, which was significantly higher than the values reported so far.

Authors

Abdul Hafeez

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
Other publications >>

Zareen Akhter

Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
Other publications >>

John F. Gallagher

School of Chemical Sciences, Dublin City University, Glasnevin, Dublin, Ireland
Other publications >>

Nawazish Ali Khan

Materials Science Laboratory, Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan
Other publications >>

Asghari Gul

Department of Chemistry, COMSATS University, Islamabad, Pakistan
Other publications >>

Faiz Ullah Shah

Luleå tekniska universitet; Kemiteknik; Chemistry of Interfaces
Other publications >>

Documents attached


Click on thumbnail to read

Record metadata

Click to view metadata