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Andrikopoulos KS, Chrissanthopoulos A, Soto Beobide A, Iconomopoulou SM, Moschopoulou H, Voyiatzis GA. Peculiar behavior of the ester carbonyl vibrational modes in anisotropic aliphatic and semi-aromatic polyesters. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 269:120710. [PMID: 34922289 DOI: 10.1016/j.saa.2021.120710] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/30/2021] [Accepted: 12/01/2021] [Indexed: 06/14/2023]
Abstract
The current work reports on a systematic study related to the vibrational modes of the ester carbonyl group in drawn polyesters. We have observed and try to explain how the presence of aromatic units in the molecular structure substantially affects the respective elements of the Raman tensor in contrast to the dipole moment derivative vector which is only marginally influenced. The work is based on the collection of polarized Raman spectra and FTIR dichroism measurements on the one hand and on DFT calculations on the other. The experimental data were obtained from uniaxially stretched aliphatic and semi-aromatic polyesters. The calculations were applied on relevant oriented oligomers and allowed the extraction: (i) of reliable Raman/FTIR vibrational spectra and (ii) the components of the dipole moment derivative and Raman tensor of the vibrational modes and in particular the ones involving the ester carbonyl group. Experimental data indicate that the intensity of the ester carbonyl band is considerably enhanced in the Raman spectra of semi-aromatic polyesters, which results from a considerable enhancement of the related coupling coefficient. Furthermore, the angles of the principle Raman tensor axis are rotated so that the element of the tensor with the greatest value is oriented towards the direction designated by the segment. The latter explains the peculiar experimentally indicated anisotropy, through the ester carbonyl stretching, for the case of semi-aromatic polyesters, which is totally different with that observed in the aliphatic ones.
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Affiliation(s)
- K S Andrikopoulos
- Foundation for Research and Technology - Hellas (FORTH), Institute of Chemical Engineering Science (ICE-HT), Stadiou St., P.O. Box 1414, Rio-Patras GR 265 04, Greece; Department of Physics, University of Patras, Patras 26504, Greece
| | - A Chrissanthopoulos
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, Athens 15771, Greece
| | - A Soto Beobide
- Foundation for Research and Technology - Hellas (FORTH), Institute of Chemical Engineering Science (ICE-HT), Stadiou St., P.O. Box 1414, Rio-Patras GR 265 04, Greece
| | - S M Iconomopoulou
- Foundation for Research and Technology - Hellas (FORTH), Institute of Chemical Engineering Science (ICE-HT), Stadiou St., P.O. Box 1414, Rio-Patras GR 265 04, Greece
| | - H Moschopoulou
- Foundation for Research and Technology - Hellas (FORTH), Institute of Chemical Engineering Science (ICE-HT), Stadiou St., P.O. Box 1414, Rio-Patras GR 265 04, Greece
| | - G A Voyiatzis
- Foundation for Research and Technology - Hellas (FORTH), Institute of Chemical Engineering Science (ICE-HT), Stadiou St., P.O. Box 1414, Rio-Patras GR 265 04, Greece.
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Grimsdale AC, Leok Chan K, Martin RE, Jokisz PG, Holmes AB. Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices. Chem Rev 2009; 109:897-1091. [PMID: 19228015 DOI: 10.1021/cr000013v] [Citation(s) in RCA: 1718] [Impact Index Per Article: 114.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrew C. Grimsdale
- School of Chemistry, Bio21 Institute, University of Melbourne, 30 Flemington Road, Victoria 3010, Australia; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798; Institute of Materials Research and Engineering (IMRE) and the Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602; and F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, Discovery Chemistry, CH-4070 Basel, Switzerland
| | - Khai Leok Chan
- School of Chemistry, Bio21 Institute, University of Melbourne, 30 Flemington Road, Victoria 3010, Australia; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798; Institute of Materials Research and Engineering (IMRE) and the Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602; and F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, Discovery Chemistry, CH-4070 Basel, Switzerland
| | - Rainer E. Martin
- School of Chemistry, Bio21 Institute, University of Melbourne, 30 Flemington Road, Victoria 3010, Australia; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798; Institute of Materials Research and Engineering (IMRE) and the Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602; and F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, Discovery Chemistry, CH-4070 Basel, Switzerland
| | - Pawel G. Jokisz
- School of Chemistry, Bio21 Institute, University of Melbourne, 30 Flemington Road, Victoria 3010, Australia; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798; Institute of Materials Research and Engineering (IMRE) and the Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602; and F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, Discovery Chemistry, CH-4070 Basel, Switzerland
| | - Andrew B. Holmes
- School of Chemistry, Bio21 Institute, University of Melbourne, 30 Flemington Road, Victoria 3010, Australia; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Republic of Singapore 639798; Institute of Materials Research and Engineering (IMRE) and the Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602; and F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, Discovery Chemistry, CH-4070 Basel, Switzerland
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Zhang WB, Jin WH, Zhou XH, Pei J. Star-shaped oligo(p-phenylene)-functionalized truxenes as blue-light-emitting materials: synthesis and the structure–property relationship. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.01.025] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Iconomopoulou SM, Voyiatzis GA. The effect of the molecular orientation on the release of antimicrobial substances from uniaxially drawn polymer matrixes. J Control Release 2005; 103:451-64. [PMID: 15763626 DOI: 10.1016/j.jconrel.2004.12.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2004] [Revised: 12/13/2004] [Accepted: 12/16/2004] [Indexed: 11/22/2022]
Abstract
A new method of controlled release of low molecular weight biocides incorporated in polymer matrixes is described. The molecular orientation of uniaxially drawn biocide doped polymer films is suggested as a significant parameter for controlled release monitoring. Triclosan, a well-established widespread antibacterial agent, has been incorporated into high density polyethylene (HDPE) films that have been subsequently uniaxially drawn at different draw ratios. The molecular orientation developed was estimated utilizing polarized mu-Raman spectra. Biocide incorporated polymer films, drawn at different draw ratios, have been immersed in ethanol-water solutions (EtOH) and in physiological saline. The release of Triclosan out of the polymer matrix was probed with UV-Vis absorption spectroscopy for a period of time up to 15 months. In all cases, although the film surface of the drawn samples exposed to the liquid solution was higher than the undrawn one, the relevant release rate from the drawn specimens was lower than the non-stretched samples depending on the molecular orientation developed during the drawing process. A note is made of the fact that no significant molecular orientation relaxation of the polyethylene films has been observed even after such a long time of immersion of the drawn films in the liquid solutions.
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Affiliation(s)
- S M Iconomopoulou
- Foundation for Research & Technology-Hellas (FORTH) Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Odos Stadiou-Rio, P.O. Box 1414, GR-265 04 Rio-Patras, Greece
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Sourisseau C. Polarization Measurements in Macro- and Micro-Raman Spectroscopies: Molecular Orientations in Thin Films and Azo-Dye Containing Polymer Systems. Chem Rev 2004; 104:3851-92. [PMID: 15352781 DOI: 10.1021/cr030042g] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Claude Sourisseau
- Laboratoire de Physico-Chimie Moléculaire, LPCM, UMR 5803-CNRS, Université Bordeaux1, 351 cours de la Libération, 33 405 Talence, Cedex, France.
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Soto A, Voyiatzis GA. Molecular Orientation of Poly(ethylene naphthalate)/Poly(ethylene terephthalate) Copolymers Utilizing Polarized Raman Spectra. Macromolecules 2002. [DOI: 10.1021/ma011229h] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Soto
- Foundation for Research & Technology-Hellas, Institute of Chemical Engineering and High-Temperature Chemical Processes and Department of Chemical Engineering, University of Patras, P.O. Box 1414, GR-265 00 Patras, Greece
| | - G. A. Voyiatzis
- Foundation for Research & Technology-Hellas, Institute of Chemical Engineering and High-Temperature Chemical Processes and Department of Chemical Engineering, University of Patras, P.O. Box 1414, GR-265 00 Patras, Greece
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Chochos CL, Kandilioti G, Deimede VA, Gregoriou VG. CORRELATION OF THE MOLECULAR ORIENTATION AND PHOTONIC PROPERTIES OF RIGID-FLEXIBLE AROMATIC POLYETHERS USING FT-IR LINEAR DICHROISM AND PHOTOLUMINESCENCE SPECTROSCOPIC TECHNIQUES. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2002. [DOI: 10.1081/ma-120015733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Nitschke JR, Tilley TD. Efficient, high-yield route to long, functionalized p-phenylene oligomers containing perfluorinated segments, and their cyclodimerizations by zirconocene coupling. J Am Chem Soc 2001; 123:10183-90. [PMID: 11603967 DOI: 10.1021/ja011018s] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Linear oligophenylene diynes containing 6, 9, and 12 phenylene rings were synthesized in high yields using the nucleophilic aromatic substitution (S(N)Ar) of perfluoroarenes by aryllithium reagents as the key carbon-carbon bond-forming reaction. This reaction was demonstrated to proceed readily at low temperatures with sterically hindered substrates and in the presence of base-sensitive silylalkynyl groups. Diynes synthesized by this methodology were readily zirconocene-coupled into large dimeric macrocycles using the zirconocene reagent Cp(2)Zr(py)(Me(3)SiC triple bond CSiMe(3)).
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Affiliation(s)
- J R Nitschke
- Center for New Directions in Organic Synthesis, Department of Chemistry, University of California, Berkeley 94720, USA
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