Detail of "3943-97-3"

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Photoreaction and Molecular Reorientation in a Nanoscaled Film of Poly(methyl 4-(methacryloyloxy)cinnamate) Studied by Two-Dimensional FTIR and UV Correlation Spectroscopy

Photoreaction and Molecular Reorientation in a Nanoscaled Film of Poly(methyl 4-(methacryloyloxy)cinnamate) Studied by Two-Dimensional FTIR and UV Correlation Spectroscopy. Chae, Boknam; Lee, Seung Woo; Ree, Moonhor; Jung, Young Mee; Kim, Seung Bin (Department of Chemistry, BK21 Functional Polymer Thin Film Group, Laboratory for Vibrational Spectroscopy, Center for Integrated Molecular Systems and Polymer Research Institute, Pohang University of Science Technology, Pohang 790-784, S. Korea). Langmuir, 19(3), 687-695 (English) 2003 American Chemical Society. CODEN: LANGD5. ISSN: 0743-7463. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Section cross-reference(s): 74 Photoreaction and photoinduced mol. reorientations in nano-scale films of poly(Me 4-(methacryloyloxy)cinnamate) (PMMCi) were studied through two-dimensional (2D) correlation analyses of the IR and UV absorption spectra. 3943-97-3 are also occured in this study. 3943-97-3 are also occured in this study. In the PMMCi film the presence of three distinct chromophore types was evident: isolated trans-isomeric cinnamoyl moieties and parallel and end-to-end cinnamoyl aggregates. The photoinduced reorientation of the chromophores takes place in the following sequence: isolated trans isomeric chromophores ? parallel chromophore aggregates ? end-to-end chromophore aggregates. The chromophores react photochem. at different rates. The PMMCi polymer mols. undergo photoisomerization and photodimerization upon UV irradn., with the trans-cis isomerization of the isolated trans isomeric cinnamoyl moieties occurring more rapidly than the photodimerization of the cinnamoyl aggregates. In photodimerization processes, the reorientation of the parallel cinnamoyl aggregates precedes that of the end-to-end cinnamoyl aggregates. The isolated chromophores may undergo photodimerization, but this fraction is expected to be small because the film is in confined geometry. The cinnamoyl moiety is present as two rotational conformers, trans-s-trans and trans-s-cis conformers. Upon UV irradn., the trans-s-trans conformer changes before the trans-s-cis conformer. The cinnamoyl moieties undergo cooperative reorientation with the methacryloyloxy units during photoreaction. The photoinduced mol. reorientations occur in the following sequence: trans isomer ? Ph ring ? trans-s-trans conformer ? trans-s-cis conformer ? photodimer. ..

Photoreaction and Molecular Reorientation in a Nanoscaled Film of Poly(methyl 4-(methacryloyloxy)cinnamate) Studied by Two-Dimensional FTIR and UV Correlation Spectroscopy

Photoreaction and Molecular Reorientation in a Nanoscaled Film of Poly(methyl 4-(methacryloyloxy)cinnamate) Studied by Two-Dimensional FTIR and UV Correlation Spectroscopy. Chae, Boknam; Lee, Seung Woo; Ree, Moonhor; Jung, Young Mee; Kim, Seung Bin (Department of Chemistry, BK21 Functional Polymer Thin Film Group, Laboratory for Vibrational Spectroscopy, Center for Integrated Molecular Systems and Polymer Research Institute, Pohang University of Science Technology, Pohang 790-784, S. Korea). Langmuir, 19(3), 687-695 (English) 2003 American Chemical Society. CODEN: LANGD5. ISSN: 0743-7463. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Section cross-reference(s): 74 Photoreaction and photoinduced mol. reorientations in nano-scale films of poly(Me 4-(methacryloyloxy)cinnamate) (PMMCi) were studied through two-dimensional (2D) correlation analyses of the IR and UV absorption spectra. 3943-97-3 are also occured in this study. 3943-97-3 are also occured in this study. In the PMMCi film the presence of three distinct chromophore types was evident: isolated trans-isomeric cinnamoyl moieties and parallel and end-to-end cinnamoyl aggregates. The photoinduced reorientation of the chromophores takes place in the following sequence: isolated trans isomeric chromophores ? parallel chromophore aggregates ? end-to-end chromophore aggregates. The chromophores react photochem. at different rates. The PMMCi polymer mols. undergo photoisomerization and photodimerization upon UV irradn., with the trans-cis isomerization of the isolated trans isomeric cinnamoyl moieties occurring more rapidly than the photodimerization of the cinnamoyl aggregates. In photodimerization processes, the reorientation of the parallel cinnamoyl aggregates precedes that of the end-to-end cinnamoyl aggregates. The isolated chromophores may undergo photodimerization, but this fraction is expected to be small because the film is in confined geometry. The cinnamoyl moiety is present as two rotational conformers, trans-s-trans and trans-s-cis conformers. Upon UV irradn., the trans-s-trans conformer changes before the trans-s-cis conformer. The cinnamoyl moieties undergo cooperative reorientation with the methacryloyloxy units during photoreaction. The photoinduced mol. reorientations occur in the following sequence: trans isomer ? Ph ring ? trans-s-trans conformer ? trans-s-cis conformer ? photodimer. ..