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Synthesis, Crystal Structures, and Spectroscopic Characterization of Bis-aldehyde Monomers and Their Electrically Conductive Pristine Polyazomethines
Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan.
Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan.
School of Chemical Sciences, Dublin City University, Glasnevin, Dublin, Ireland.
Materials Science Laboratory, Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan.
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2019 (English)In: Polymers, ISSN 2073-4360, E-ISSN 2073-4360, Vol. 11, no 9, article id 1498Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 11, no 9, article id 1498
Keywords [en]
Polyazomethines, single crystals, bis-aldehydes, spectroscopic characterization, conductivity, poly(Schiff base)s
National Category
Polymer Chemistry Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-75995DOI: 10.3390/polym11091498PubMedID: 31540265Scopus ID: 2-s2.0-85072514470OAI: oai:DiVA.org:ltu-75995DiVA, id: diva2:1351292
Note

Validerad;2019;Nivå 2;2019-09-18 (johcin)

Available from: 2019-09-13 Created: 2019-09-13 Last updated: 2019-10-02Bibliographically approved

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