Synthesis, Crystal Structures, and Spectroscopic Characterization of Bis-aldehyde Monomers and Their Electrically Conductive Pristine Polyazomethines
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials
2.2. Physical Characterizations
2.3. Syntheses of Monomers (3a to 3c)
4-(4′-.Formyl-phenoxy)benzaldehyde (3a)
3-Met.hoxy-4-(4′-formyl-phenoxy)benzaldehyde (3b)
X-ray Crystallographic Data of 3b
3-Eth.oxy-4-(4′-formyl-phenoxy)benzaldehyde (3c)
X-ray Crystallographic Data of 3c
2.4. Syntheses of Polyazomethine Polymers (P-I to P-VI)
3. Results and Discussion
3.1. Syntheses and Characterization of Monomers (3a, 3b, and 3c)
3.2. Syntheses of Polyazomethines
3.3. Powder X-ray Diffraction
3.4. UV–Vis and Photoluminescence Measurements
3.5. Thermal Properties
3.6. Electrical Conductivity
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Polymer | λmax (nm) a | λmax (nm) b | λmax (nm) c | λonset (nm) c | Eg (eV) c,d | PL λmax (nm) c | Stoke’s Shift (nm) |
---|---|---|---|---|---|---|---|
P-I | – | – | 432, 286 | 488 | 2.54 | 486 | 54 |
P-II | 365, 281 | 372, 282 | 404, 283 | 487 | 2.55 | 491 | 87 |
P-III | 365, 279 | 373, 282 | 391, 283 | 485 | 2.56 | 482 | 91 |
P-IV | – | – | 411, 285 | 477 | 2.60 | 481 | 70 |
P-V | 344, 285 | 345, 287 | 415 | 480 | 2.59 | 492 | 77 |
P-VI | 341, 282 | 343, 284 | 408, 285 | 471 | 2.64 | 492 | 84 |
Polymer | Ton (°C) | T20% (°C) | Tmax (°C) | TF (°C) | %Char Residue |
---|---|---|---|---|---|
P-I | 300 | 525 | 525 | 650 | 53.3 |
P-II | 300 | 490 | 650 | 950 | 38.5 |
P-III | 150 | 510 | 550 | 950 | 32 |
P-IV | 450 | 520 | 530 | 650 | 46.6 |
P-V | 360 | 430 | 475 | 630 | 57 |
P-VI | 125 | 450 | 575 | 600 | 60 |
Polymer | Resistance (R) × 103 Ω | Conductance (G) × 10−3 Ohm−1 | Conductivity (σ) Scm−1 |
---|---|---|---|
P-I | 4.74437 ± 1.07 | 0.210 | 5.1 × 10−5 |
P-II | 6.08604 ± 1.49 | 0.164 | 4.0 × 10−5 |
P-III | 3.83071 ± 0.81 | 0.261 | 6.4 × 10−5 |
P-IV | 5.12437 ± 0.69 | 0.195 | 4.8 × 10−5 |
P-V | 4.91478 ± 0.82 | 0.203 | 5.0 × 10−5 |
P-VI | 5.28489 ± 0.63 | 0.198 | 4.8 × 10−5 |
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Hafeez, A.; Akhter, Z.; Gallagher, J.F.; Khan, N.A.; Gul, A.; Shah, F.U. Synthesis, Crystal Structures, and Spectroscopic Characterization of Bis-aldehyde Monomers and Their Electrically Conductive Pristine Polyazomethines. Polymers 2019, 11, 1498. https://doi.org/10.3390/polym11091498
Hafeez A, Akhter Z, Gallagher JF, Khan NA, Gul A, Shah FU. Synthesis, Crystal Structures, and Spectroscopic Characterization of Bis-aldehyde Monomers and Their Electrically Conductive Pristine Polyazomethines. Polymers. 2019; 11(9):1498. https://doi.org/10.3390/polym11091498
Chicago/Turabian StyleHafeez, Abdul, Zareen Akhter, John F. Gallagher, Nawazish Ali Khan, Asghari Gul, and Faiz Ullah Shah. 2019. "Synthesis, Crystal Structures, and Spectroscopic Characterization of Bis-aldehyde Monomers and Their Electrically Conductive Pristine Polyazomethines" Polymers 11, no. 9: 1498. https://doi.org/10.3390/polym11091498