Amplified optical nonlinearity in a self-assembled double-strand conjugated porphyrin polymer ladder.
Addition of 4,4'-bipyridyl to a solution of a meso-meso butadiyne-linked conjugated zinc porphyrin polymer in chloroform results in self-assembly of a double-strand ladder complex. Excess ligand causes this duplex to dissociate into single strands. These binding processes were elucidated by nea...
| Glavni autori: | , , , , |
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| Format: | Journal article |
| Jezik: | English |
| Izdano: |
2002
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| _version_ | 1826266176697663488 |
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| author | Screen, T Thorne, JR Denning, R Bucknall, D Anderson, H |
| author_facet | Screen, T Thorne, JR Denning, R Bucknall, D Anderson, H |
| author_sort | Screen, T |
| collection | OXFORD |
| description | Addition of 4,4'-bipyridyl to a solution of a meso-meso butadiyne-linked conjugated zinc porphyrin polymer in chloroform results in self-assembly of a double-strand ladder complex. Excess ligand causes this duplex to dissociate into single strands. These binding processes were elucidated by near-IR and NMR titrations, as well as by gel permeation chromatography and small-angle neutron scattering. Ladder-making and -breaking are highly cooperative, with Hill coefficients of 3.0 and 3.7, respectively. Self-assembly of the ladder holds the pi-system in a planar conformation, enhancing the conjugation, resulting in a red-shift and intensification of the Q-band. Both the real and imaginary parts of the third-order susceptibility per macrocycle are amplified by ladder formation, as revealed by degenerate four-wave mixing measurements at 1064 nm. At this wavelength, the double-strand polymer complex has |chi(3)xyyx| = 6.0 x 10-17 m2 V-2 per macrocycle, compared with 6.6 x 10-18 m2 V-2 for the single-strand polymer under the same conditions. |
| first_indexed | 2024-03-06T20:34:57Z |
| format | Journal article |
| id | oxford-uuid:3251bb04-848a-4a97-845c-09f49f104e1a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:34:57Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:3251bb04-848a-4a97-845c-09f49f104e1a2022-03-26T13:13:14ZAmplified optical nonlinearity in a self-assembled double-strand conjugated porphyrin polymer ladder.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:3251bb04-848a-4a97-845c-09f49f104e1aEnglishSymplectic Elements at Oxford2002Screen, TThorne, JRDenning, RBucknall, DAnderson, HAddition of 4,4'-bipyridyl to a solution of a meso-meso butadiyne-linked conjugated zinc porphyrin polymer in chloroform results in self-assembly of a double-strand ladder complex. Excess ligand causes this duplex to dissociate into single strands. These binding processes were elucidated by near-IR and NMR titrations, as well as by gel permeation chromatography and small-angle neutron scattering. Ladder-making and -breaking are highly cooperative, with Hill coefficients of 3.0 and 3.7, respectively. Self-assembly of the ladder holds the pi-system in a planar conformation, enhancing the conjugation, resulting in a red-shift and intensification of the Q-band. Both the real and imaginary parts of the third-order susceptibility per macrocycle are amplified by ladder formation, as revealed by degenerate four-wave mixing measurements at 1064 nm. At this wavelength, the double-strand polymer complex has |chi(3)xyyx| = 6.0 x 10-17 m2 V-2 per macrocycle, compared with 6.6 x 10-18 m2 V-2 for the single-strand polymer under the same conditions. |
| spellingShingle | Screen, T Thorne, JR Denning, R Bucknall, D Anderson, H Amplified optical nonlinearity in a self-assembled double-strand conjugated porphyrin polymer ladder. |
| title | Amplified optical nonlinearity in a self-assembled double-strand conjugated porphyrin polymer ladder. |
| title_full | Amplified optical nonlinearity in a self-assembled double-strand conjugated porphyrin polymer ladder. |
| title_fullStr | Amplified optical nonlinearity in a self-assembled double-strand conjugated porphyrin polymer ladder. |
| title_full_unstemmed | Amplified optical nonlinearity in a self-assembled double-strand conjugated porphyrin polymer ladder. |
| title_short | Amplified optical nonlinearity in a self-assembled double-strand conjugated porphyrin polymer ladder. |
| title_sort | amplified optical nonlinearity in a self assembled double strand conjugated porphyrin polymer ladder |
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