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Journal of the American Chemical Society
Volumn 121, Issue 7, 1999, Pages 1607-1608
Remarkable enhancement of second-order nonlinear optical properties of polynorbornenes having pendant chromophores. Use of hyper-Rayleigh scattering to estimate the tacticity of rigid rod polymers [6]
Author keywords

[No Author keywords available]
Indexed keywords

NORBORNENE DERIVATIVE; POLYMER;
EID: 0033599292     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja983433z     Document Type: Letter
Times cited : (48)
References (45)
  • 28
    • 0344426815 scopus 로고    scopus 로고
    • Scheme I is described in the Supporting Information
    • Scheme I is described in the Supporting Information.
  • 30
    • 0000751315 scopus 로고
    • Such discrepancies have also been observed in other systems (ref 1b). There is a possibility that the pendent chromphores may form H-aggregate (Witten, D. G. Acc. Chem. Res. 1993, 26, 502; Yuzhakov, V. I. Russ. Chem. Rev. 1979, 48, 1076) which may provoke blue shifts in the absorption maxima for polymers relative to those of the corresponding monomers. Alternatively, the ring-strain difference in the polymers versus in the monomers may also cause discrepancy.
    • (1993) Acc. Chem. Res. , vol.26 , pp. 502
    • Witten, D.G.1
  • 31
    • 0041151513 scopus 로고
    • which may provoke blue shifts in the absorption maxima for polymers relative to those of the corresponding monomers. Alternatively, the ring-strain difference in the polymers versus in the monomers may also cause discrepancy
    • Such discrepancies have also been observed in other systems (ref 1b). There is a possibility that the pendent chromphores may form H-aggregate (Witten, D. G. Acc. Chem. Res. 1993, 26, 502; Yuzhakov, V. I. Russ. Chem. Rev. 1979, 48, 1076) which may provoke blue shifts in the absorption maxima for polymers relative to those of the corresponding monomers. Alternatively, the ring-strain difference in the polymers versus in the monomers may also cause discrepancy.
    • (1979) Russ. Chem. Rev. , vol.48 , pp. 1076
    • Yuzhakov, V.I.1
  • 35
    • 36749107537 scopus 로고
    • 0 values of the samples were calculated by the undamped two-state model (Oudar, J. L. J. Chem. Phys. 1977, 67, 446).
    • (1977) J. Chem. Phys. , vol.67 , pp. 446
    • Oudar, J.L.1
  • 43
    • 0345289919 scopus 로고    scopus 로고
    • 2 programs, using the OFF method. Semiempirical calculations were done with MOPAC7 program. The initial syn conformation was assumed for the syndio- and isotactic model system (Figure 2), and for 2b (Figure 3). MDOFF calculations were performed in gas phase at room temperature for 20 ps
    • 2 programs, using the OFF method. Semiempirical calculations were done with MOPAC7 program. The initial syn conformation was assumed for the syndio- and isotactic model system (Figure 2), and for 2b (Figure 3). MDOFF calculations were performed in gas phase at room temperature for 20 ps.
  • 44
    • 0344426811 scopus 로고    scopus 로고
    • We have also calculated PNBs 2 having cis double bonds. Both syndio- and isotactic isomers exhibit random coil conformation. The persistent length is less than four monomeric units
    • We have also calculated PNBs 2 having cis double bonds. Both syndio- and isotactic isomers exhibit random coil conformation. The persistent length is less than four monomeric units.

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