Abstract
Excellent quadratic non-linear optical (ONL-2) properties of the poly(2,5-bis(but-2-ynyloxy) benzoate, containing a polar diacetylene as a chromophore, were found. According with the Maker fringes method, oriented polymer films showing an order parameter of ∼0.23 can display outstanding and stable Second Harmonic Generation (SHG) effects under off-resonant conditions (SHG-532 nm). Also, the macroscopic non-linear optical (NLO)-coefficients were evaluated under the rod-like molecular approximation, obtaining: χzzz(2) and χzxx(2) in the order of 280 ± 10 and 100 ± 10 pm V−1, respectively. The mechanical and chemical properties, in addition to the large ONL-2 coefficients exhibited by this polymer, make it a promising organic material in the development of optoelectronic/photonic devices.
Highlights
Polydiacetylenes (PDAs) are a unique class of linear conjugated polymers derived from the topochemical polymerization of diacetylene (DA) monomers
R–C≡C–C≡C–R, where the polymer backbone consists of alternating their alkene–alkyne structures. Owing to their intriguing stress-induced chromic transition and non-linear optical properties (NLO), PDAs have been extensively investigated as potential chemosensors and photonic
From our experience, the diacetylene pi-bridge provides more conjugation to the chromophore, and better NLO responsiveness can be achieved as we present using polymer 10
Summary
Polydiacetylenes (PDAs) are a unique class of linear conjugated polymers derived from the topochemical polymerization of diacetylene (DA) monomers. Considering quadratic NLO-applications such as SHG within the dipolar approximation, rod-like organic compounds display NLO-activity if they include conjugated molecules within their molecular architectures Such conjugated moieties must contain substituents that bestow an important degree of push-pull effect unto them via electron donating (D) and electron accepting (A) functional groups. The monomeric DAs are often non-reactive, or ofthe corresponding polymer is not soluble in common organic solvents, leading to material instability and/or unprocessability, which have significantly limited their use in practical technological instability and/or unprocessability, which have significantly limited their use in practical technological applications [2,18,19,20]. The development of PDAs networks, thin films and their quadratic SHG/NLO-characterization
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