ISSN:
1022-1352
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
We synthesized aromatic ester derivatives with some electron accepting groups at molecular ends as new class of nonlinear optical (NLO) active chromophores (ArESn-X, n = 2, 3, X = CN, CF3, NO2, DCV). Some second-order NLO properties for poled polymer films consisting of poly(methyl methacrylate) (PMMA) doped with 10 wt.-% ArESn-X (ArESn-X/PMMA) were investigated. UV/vis spectra of these polymer films have cutoff wavelengths (λco) of about 300∼380 nm, which are much shorter than in the case of p-nitroaniline (pNA) (λco = ca. 450 nm) as a typical strong donor-acceptor (D-A) molecule. In addition, some of these polymer films exhibited larger second-order nonlinear coefficient (d33) values than PMMA film doped with 10 wt.-% pNA (pNA/PMMA) (2.8 × 10-9 esu). Namely, ArES3-CN (d33 = 3.1 × 10-9 esu, 10 wt.-% in PMMA), ArES3-NO2 (3.0 × 10-9 esu, 10 wt.-% in PMMA) and ArES2-DCV (4.0 × 10-9 esu, 10 wt.-% in PMMA) showed not only excellent second-order NLO activity but also excellent transparency in the visible region (λco = 304 nm (ArES3-CN), 340 nm (ArES3-NO2) and 370 nm (ArES2-DCV), respectively). Consequently, these compounds are believed to be promising chromophores for second-order nonlinear optics.
Zusätzliches Material:
6 Ill.
Materialart:
Digitale Medien
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