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Volumn 112, Issue 32, 2008, Pages 9613-9624

Structure-property relationships of polyselenoethers [-(CH 2)ySe-]x (y = 1, 2, and 3) and related polyethers and polysulfides

Author keywords

[No Author keywords available]

Indexed keywords

STRUCTURE-PROPERTY RELATIONSHIPS; THERMAL PROPERTIES;

EID: 50549101230     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp800597s     Document Type: Article
Times cited : (16)

References (78)
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    • Kambara, S. Private Remarks on Molecular Design In Molecular Design of Polymers (Koubunshi no Bunshi Sekkei); Kawai, T., Uno, K., Oya, M., Komoto, T., Tsuchida, E., Nakajima, T., Fukada, E., Yamazaki, N., Yamada, N., Eds.; Baifukan: Tokyo, 1972; 3, pp 3-7. (written in Japanese).
    • Kambara, S. Private Remarks on Molecular Design In Molecular Design of Polymers (Koubunshi no Bunshi Sekkei); Kawai, T., Uno, K., Oya, M., Komoto, T., Tsuchida, E., Nakajima, T., Fukada, E., Yamazaki, N., Yamada, N., Eds.; Baifukan: Tokyo, 1972; Vol. 3, pp 3-7. (written in Japanese).
  • 2
    • 84906367707 scopus 로고    scopus 로고
    • For example, we guess the following future. A scientist sits before a computer terminal to specify some structures, physical properties, and/or functions and search for the candidate polymers. The computer shows a list of the fitted polymers on the display. The selection is based on theoretical computations for existent and nonexistent polymers as well as database on existent polymers; therefore, the list includes nonexistent polymers. If the scientist chooses one of them, the computer returns detailed information on the synthetic routes, costs, toxicity, etc. If a synthetic method is indicated, the computer transmits the data to an automatic polymer synthesizer. On the next morning, he or she will find the polymer precipitated in a flask placed inside the synthesizer
    • For example, we guess the following future. A scientist sits before a computer terminal to specify some structures, physical properties, and/or functions and search for the candidate polymers. The computer shows a list of the fitted polymers on the display. The selection is based on theoretical computations for existent and nonexistent polymers as well as database on existent polymers; therefore, the list includes nonexistent polymers. If the scientist chooses one of them, the computer returns detailed information on the synthetic routes, costs, toxicity, etc. If a synthetic method is indicated, the computer transmits the data to an automatic polymer synthesizer. On the next morning, he or she will find the polymer precipitated in a flask placed inside the synthesizer.
  • 20
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    • 13
    • 13
  • 22
    • 84906382188 scopus 로고    scopus 로고
    • Organoselenium compounds including polyselenoethers have often been prepared in similar manners for the corresponding organic sulfides
    • Organoselenium compounds including polyselenoethers have often been prepared in similar manners for the corresponding organic sulfides.
  • 23
    • 84906396785 scopus 로고    scopus 로고
    • Frisch, M. J, Trucks, G. W, Schlegel, H. B, Scuseria, G. E, Robb, M. A, Cheeseman, J. R, Montgomery, Jr, J. A, Vreven, T, Kudin, K. N, Burant, J. C, Millam, J. M, Iyengar, S. S, Tomasi, J, Barone, V, Mennucci, B, Cossi, M, Scalmani, G, Rega, N, Petersson, G. A, Nakatsuji, H, Hada, M, Ehara, M, Toyota, K, Fukuda, R, Hasegawa, J, Ishida, M, Nakajima, T, Honda, Y, Kitao, O, Nakai, H, Klene, M, Li, X, Knox, J. E, Hratchian, H. P, Cross, J. B, Bakken, V, Adamo, C, Jaramillo, J, Gomperts, R, Stratmann, R. E, Yazyev, O, Austin, A. J, Cammi, R, Pomelli, C, Ochterski, J. W, Ayala, P. Y, Morokuma, K, Voth, G. A, Salvador, P, Dannenberg, J. J, Zakrzewski, V. G, Dapprich, S, Daniels, A. D, Strain, M. C, Farkas, O, Malick, D. K, Rabuck, A. D, Raghavachari, K, Foresman, J. B, Ortiz, J. V, Cui, Q, Baboul, A. G, Clifford, S, Cioslowski, J, Stefanov, B. B, Liu, G, Liashenko, A, Piskorz, P, Komaromi, I, Martin, R. L, Fox, D. J, Keit
    • Frisch, M. J.; Trucks, G. W.; Schlegel, H. B.; Scuseria, G. E.; Robb, M. A.; Cheeseman, J. R.; Montgomery, Jr., J. A.; Vreven, T.; Kudin, K. N.; Burant, J. C.; Millam, J. M.; Iyengar, S. S.; Tomasi, J.; Barone, V.; Mennucci, B.; Cossi, M.; Scalmani, G.; Rega, N.; Petersson, G. A.; Nakatsuji, H.; Hada, M.; Ehara, M.; Toyota, K.; Fukuda, R.; Hasegawa, J.; Ishida, M.; Nakajima, T.; Honda, Y.; Kitao, O.; Nakai, H.; Klene, M.; Li, X.; Knox, J. E.; Hratchian, H. P.; Cross, J. B.; Bakken, V.; Adamo, C.; Jaramillo, J.; Gomperts, R.; Stratmann, R. E.; Yazyev, O.; Austin, A. J.; Cammi, R.; Pomelli, C.; Ochterski, J. W.; Ayala, P. Y.; Morokuma, K.; Voth, G. A.; Salvador, P.; Dannenberg, J. J.; Zakrzewski, V. G.; Dapprich, S.; Daniels, A. D.; Strain, M. C.; Farkas, O.; Malick, D. K.; Rabuck, A. D.; Raghavachari, K.; Foresman, J. B.; Ortiz, J. V.; Cui, Q.; Baboul, A. G.; Clifford, S.; Cioslowski, J.; Stefanov, B. B.; Liu, G.; Liashenko, A.; Piskorz, P.; Komaromi, I.; Martin, R. L.; Fox, D. J.; Keith, T.; Al-Laham, M. A.; Peng, C. Y.; Nanayakkara, A.; Challacombe, M.; Gill, P. M. W.; Johnson, B.; Chen, W.; Wong, M. W.; Gonzalez, C.; Pople, J. Gaussian03, revision D.01; Gaussian, Inc.: Wallingford, CT, 2004.
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    • Budzelaar, P. H. M. gNMR, version 5.0. IvorySoft & Adept Scientific pic: Letchworth, U.K, 2004
    • Budzelaar, P. H. M. gNMR, version 5.0. IvorySoft & Adept Scientific pic: Letchworth, U.K., 2004.
  • 34
    • 84906410971 scopus 로고    scopus 로고
    • seH can not determined only from the simulation, and hence the absolute values are given.
    • seH can not determined only from the simulation, and hence the absolute values are given.
  • 37
    • 84906410972 scopus 로고    scopus 로고
    • An extra instability of ΔGn, 2Eσ ∼ 2 kcal mol-1 may occur in the tt conformation of BMSeM. This may be due to, for example, the interaction between parallel dipole moments. If this interaction, designated provisionally as &tau, is included, the U 3 matrix of BMSeM and PMSe is revised to U3, στ-1 1 1 σ-1 1 0 σ-1 0 1] and the Ua and the Ub matrices are also modified similarly. The revised matrices slightly change the p t value of BMSeM (0.12 → 0.11) and the characteristic ratio of PMSe at 25°C 7.29 → 7.58, Whether the interaction is substantial or not, it has not been taken into account because of the rare occurrence of the tt conformation, the negligible effects, and the consistency with the previous studies;5 the Uj matrices shown in Appendix S1 have been adopted here
    • j matrices shown in Appendix S1 have been adopted here.
  • 38
    • 84906382186 scopus 로고    scopus 로고
    • The dipole potential is given by Edip, k, μk2(4πε0εrl k3) where ε0 is the electric constant, εr is the dielectric constant, and lk is the dipole distance. The dipole moment is assumed to arise from a pair of imaginary point charges, qk and-qk, separated by lk: μk, qklk. The conformer free energy is given as the sum of the dipole potential and the net conformer energy E conf, k, Gk, Edip,k, Econf, k. The dipole distance is approximated as lk, α a0,k where a0,k is the conformer radius of Onsager's model,39 and α is the proportionality factor. In Onsager's model, the conformer is assumed to be spherical. The a value was so adjusted as to minimize the difference between free energie
    • 40 However, this study has dealt with only well-defined interactions under the 9 × 9 matrix scheme.
  • 47
    • 84906410973 scopus 로고    scopus 로고
    • Glendening, E. D, Reed, A. E, Carpenter, J. E, Weinhold, F. NBO version 3.1; Theoretical Chemistry Institute and Department of Chemistry, University of Wisconsin: Madison, WI
    • Glendening, E. D.; Reed, A. E.; Carpenter, J. E.; Weinhold, F. NBO version 3.1; Theoretical Chemistry Institute and Department of Chemistry, University of Wisconsin: Madison, WI.
  • 48
    • 84906410974 scopus 로고    scopus 로고
    • 5-12 (mentioned in the Introduction) and references cited therein. The crystallographic data are taken from the following papers. PMO, (a) Uchida, T.; Tadokoro, H. J. Polym. Sci., Part A-2 1967, 5, 63. PEO,
    • 5-12 (mentioned in the Introduction) and references cited therein. The crystallographic data are taken from the following papers. PMO, (a) Uchida, T.; Tadokoro, H. J. Polym. Sci., Part A-2 1967, 5, 63. PEO,
  • 58
    • 0010904167 scopus 로고    scopus 로고
    • m values shown in Table 10 were selected partly from the papers here and mainly from the PolyInfo Database (http://polymer.nims.go.jp/) provided by the Materials Information Technology Station of the National Institute for Materials Science, Japan.
    • m values shown in Table 10 were selected partly from the papers here and mainly from the PolyInfo Database (http://polymer.nims.go.jp/) provided by the Materials Information Technology Station of the National Institute for Materials Science, Japan.
  • 61
    • 84906367705 scopus 로고    scopus 로고
    • In the original papers49,50 on the crystal structures, the (S)-optical forms are used as the models. For consistency with our previous and present papers, the discussion here is based on the (R)-configurations
    • 49,50 on the crystal structures, the (S)-optical forms are used as the models. For consistency with our previous and present papers, the discussion here is based on the (R)-configurations.
  • 69
    • 84906367706 scopus 로고    scopus 로고
    • j matrices must be scaled so that the crystal conformation has the statistical weight of unity.
    • j matrices must be scaled so that the crystal conformation has the statistical weight of unity.
  • 70
    • 84906410967 scopus 로고    scopus 로고
    • In the previous paper,8 the Uconf values of PMO and PMS were given in the unit of per mole of skeletal bond; here, the thermodynamic parameters have been evaluated in the unit of per mole of monomeric unit
    • conf values of PMO and PMS were given in the unit of per mole of skeletal bond; here, the thermodynamic parameters have been evaluated in the unit of per mole of monomeric unit.
  • 71
    • 84906410968 scopus 로고    scopus 로고
    • conf value here may indirectly represent the motional effects to a certain extent.
    • conf value here may indirectly represent the motional effects to a certain extent.
  • 72
    • 84906410969 scopus 로고    scopus 로고
    • inter terms are closely interdependent.
    • inter terms are closely interdependent.
  • 74
    • 84906410962 scopus 로고    scopus 로고
    • For PMO, the DOS calculations were attempted with the geometrical parameters as determined by X-ray diffraction and gave a DOS profile nearly identical to that shown in Figure 8.
    • For PMO, the DOS calculations were attempted with the geometrical parameters as determined by X-ray diffraction and gave a DOS profile nearly identical to that shown in Figure 8.
  • 78
    • 84906410963 scopus 로고    scopus 로고
    • Ordinarily, the band structure is represented with respect to critical points within the first Brillouin zone. This is meaningful especially for highly symmetric cells such as body-and face-centered cubics of metals and inorganic substances. Owing to the anisotropy of the PESe chain in the orthorhombic lattice, the band energies are plotted against paths passing through the conventional reciprocal lattice points
    • Ordinarily, the band structure is represented with respect to critical points within the first Brillouin zone. This is meaningful especially for highly symmetric cells such as body-and face-centered cubics of metals and inorganic substances. Owing to the anisotropy of the PESe chain in the orthorhombic lattice, the band energies are plotted against paths passing through the conventional reciprocal lattice points.


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