Nonlinear optical analysis of a series of triblock copolymers containing model polyenes: The dependence of hyperpolarizability on conjugation length
- Massachusetts Inst. of Technology, Cambridge (United States)
- Centre National d'Etudes des Telecommunications, Bagneux (France)
Sequential ring-opening metathesis polymerization of norbornene and 7,8-bis(trifluoromethyl)tricyclo[4.2.2.0[sup 2.5]]-deca-3,7,9-triene with Mo(CHCMe[sub 3])(NAr)(OCMe[sub 3])[sub 2] (Ar = 2,6-diisopropylphenyl) followed by linking termination with a conjugated dialdehyde results in highly soluble A-B-A triblock copolymers containing an oligomer of a precursor of Durham polyacetylene as the central block. Subsequent heat treatment converts the polyacetylene precursors into model polyenes. A series of these copolymers that had conjugation lengths ranging from 4 to 16 double bonds was synthesized. The polyenes were isomerized to the predominantly all-trans isomer. The presence of the polynorbornene chains solubilizes the polyenes, allowing their hyperpolarizability to be probed with electric field induced second harmonic generation; [gamma][sub N]([minus]2[omega][sup [sm bullet]],[omega][omega],0) and [gamma][sub N](0) varied with conjugation length to the 3.6 and 3.2 powers, respectively. 54 refs., 8 figs., 4 tabs.
- OSTI ID:
- 6250672
- Journal Information:
- Journal of the American Chemical Society; (United States), Vol. 115:3; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPOLYMERS
ISOMERIZATION
OPTICAL PROPERTIES
SOLUBILITY
SYNTHESIS
ALDEHYDES
ELECTRIC FIELDS
EXPERIMENTAL DATA
HEAT TREATMENTS
MOLECULAR STRUCTURE
MOLYBDENUM COMPOUNDS
POLYMERIZATION
SPECTROSCOPY
CHEMICAL REACTIONS
DATA
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHYSICAL PROPERTIES
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REFRACTORY METAL COMPOUNDS
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400201* - Chemical & Physicochemical Properties
400500 - Photochemistry
400102 - Chemical & Spectral Procedures