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Volumn 129, Issue 6, 2007, Pages 1634-1643

Intermolecular covalent π-π bonding interaction indicated by bond distances, energy bands, and magnetism in biphenalenyl biradicaloid molecular crystal

Author keywords

[No Author keywords available]

Indexed keywords

BAND STRUCTURE; CHEMICAL BONDS; MAGNETISM; MOLECULAR CRYSTALS; PROBABILITY DENSITY FUNCTION; SEMICONDUCTING ORGANIC COMPOUNDS;

EID: 33846945073     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja066426g     Document Type: Article
Times cited : (143)

References (92)
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    • Kubo, T.; Shimizu, A.; Sakamoto, M.; Uruichi, M.; Yakushi, K.; Nakano, M.; Shiomi, D.; Sato, K.; Takui, T.; Morita, Y.; Nakasuji, K. Angew. Chem., Int. Ed. 2005, 44, 6564. The crystal structure of 4 can be obtained from CCDC (deposition number 275077).
    • Kubo, T.; Shimizu, A.; Sakamoto, M.; Uruichi, M.; Yakushi, K.; Nakano, M.; Shiomi, D.; Sato, K.; Takui, T.; Morita, Y.; Nakasuji, K. Angew. Chem., Int. Ed. 2005, 44, 6564. The crystal structure of 4 can be obtained from CCDC (deposition number 275077).
  • 32
    • 33846985432 scopus 로고    scopus 로고
    • The bulky tert-butyl groups in 3 do not allow a face-to-face π-π intermolecular packing of the phenalenyl units, while this is possible for 1. This is because the tert-butyl groups of 3 are attached to spin-bearing C atoms and they bump into each other when forming π-stacking, while the tett-butyl groups of the π-dimer of 1 are staggered. In the case of 2, such a π-π intermolecular packing of the phenalenyl units is possible.
    • The bulky tert-butyl groups in 3 do not allow a face-to-face π-π intermolecular packing of the phenalenyl units, while this is possible for 1. This is because the tert-butyl groups of 3 are attached to spin-bearing C atoms and they bump into each other when forming π-stacking, while the tett-butyl groups of the π-dimer of 1 are staggered. In the case of 2, such a π-π intermolecular packing of the phenalenyl units is possible.
  • 33
    • 33846971790 scopus 로고    scopus 로고
    • Transfer integral t is used interchangeably with resonance integral β.
    • Transfer integral t is used interchangeably with resonance integral β.
  • 34
    • 33846980616 scopus 로고    scopus 로고
    • The term alternating chain does not mean the two resonance structures shown in Scheme 4 of ref 13, but means that the intermolecular and intramolecular interactions exist simultaneously, leading to two magnetic exchange parameters not equal to each other.
    • The term "alternating chain" does not mean the two resonance structures shown in Scheme 4 of ref 13, but means that the intermolecular and intramolecular interactions exist simultaneously, leading to two magnetic exchange parameters not equal to each other.
  • 35
    • 0004236045 scopus 로고
    • See, for example:, VCH Publishers: New York
    • See, for example: Kahn, O. Molecular Magnetism; VCH Publishers: New York, 1993; pp 103-111.
    • (1993) Molecular Magnetism , pp. 103-111
    • Kahn, O.1
  • 36
    • 33846959621 scopus 로고    scopus 로고
    • It is not a priori known which of the two exchange parameters corresponds to intra- and intermolecular interactions, respectively. The assignment of J1 to intramolecular and J2 to intermolecular interactions is based on transfer integrals associated with the intramolecular and intermolecular SOMO-SOMO overlaps. See the magnetism section
    • 2 to intermolecular interactions is based on transfer integrals associated with the intramolecular and intermolecular SOMO-SOMO overlaps. See the magnetism section.
  • 37
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    • Itoh, K, Kinoshita, M, Eds, Kodansha Ltd, Gordon and Beach Science Publishers: Tokyo, Amsterdam
    • Kawakami, T. In Molecular Magnetism-New Magnetic Materials; Itoh, K., Kinoshita, M., Eds.; Kodansha Ltd., Gordon and Beach Science Publishers: Tokyo, Amsterdam, 2000: pp 9-10.
    • (2000) Molecular Magnetism-New Magnetic Materials , pp. 9-10
    • Kawakami, T.1
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    • Abecassis de Laredo, E, Jurisic, N. K, Eds, D. Reidel Publishing Co, Dordrecht-Holland, The Netherlands
    • (c) Pincus, P. In Selected Topics in Physics, Astrophysics, and Biophysics; Abecassis de Laredo, E., Jurisic, N. K., Eds.; D. Reidel Publishing Co.: Dordrecht-Holland, The Netherlands, 1973; p 152.
    • (1973) Selected Topics in Physics, Astrophysics, and Biophysics , pp. 152
    • Pincus, P.1
  • 43
    • 33748211136 scopus 로고    scopus 로고
    • Short-range electron correlation plays a significant role in determining the U value. See Ohno, K.; Noguchi, Y.; Yokoi, T.; Ishii, S.; Takeda, J.; Furuya, M. ChemPhysChem 2006, 7, 1820. The larger the SOMO electron delocalization domain, the smaller the U value because the two electrons have larger space to avoid each other.
    • (a) Short-range electron correlation plays a significant role in determining the U value. See Ohno, K.; Noguchi, Y.; Yokoi, T.; Ishii, S.; Takeda, J.; Furuya, M. ChemPhysChem 2006, 7, 1820. The larger the SOMO electron delocalization domain, the smaller the U value because the two electrons have larger space to avoid each other.
  • 44
    • 33846957533 scopus 로고    scopus 로고
    • For an example of U = ca. 1 eV for organic radicals with intermediate domains, see, for example: Tanner, D. B. In Extended Linear Chain Compounds; Miller, J. S., Ed.; Plenum Press: New York, 1983; 2, p 205.
    • (b) For an example of U = ca. 1 eV for organic radicals with intermediate domains, see, for example: Tanner, D. B. In Extended Linear Chain Compounds; Miller, J. S., Ed.; Plenum Press: New York, 1983; Vol. 2, p 205.
  • 45
    • 33846969727 scopus 로고    scopus 로고
    • For the U value of ca. 1 eV for the title compounds, see refs. 13 and 14.
    • (c) For the U value of ca. 1 eV for the title compounds, see refs. 13 and 14.
  • 47
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    • Frisch, M. J.; et al. Gaussian 03, revision B.04; Gaussian, Inc.: Pittsburgh, PA, 2003.
    • Frisch, M. J.; et al. Gaussian 03, revision B.04; Gaussian, Inc.: Pittsburgh, PA, 2003.
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    • Using Vanderbilt-type (Vanderbilt, D. Phys. Rev. B: Condens. Matter Mater. Phys. 1990, 41, 7892) untrasoft pseudo-potentials
    • (c) Using Vanderbilt-type (Vanderbilt, D. Phys. Rev. B: Condens. Matter Mater. Phys. 1990, 41, 7892) untrasoft pseudo-potentials
  • 66
    • 33846952990 scopus 로고    scopus 로고
    • This may result from the substitution of tert-butyl groups since in the case of 2 all bond distances agree with those of the unsubstituted BPBR including bonds f and i see Table 2
    • This may result from the substitution of tert-butyl groups since in the case of 2 all bond distances agree with those of the unsubstituted BPBR including bonds f and i (see Table 2).
  • 69
    • 33846966116 scopus 로고    scopus 로고
    • Fully optimized bond distances of a through k for complex 5 are (in Å): 1.468, 1.444, 1.404, 1.397, 1.414, 1.428, 1.396, 1.407, 1.426, 1.395, and 1.416.
    • Fully optimized bond distances of a through k for complex 5 are (in Å): 1.468, 1.444, 1.404, 1.397, 1.414, 1.428, 1.396, 1.407, 1.426, 1.395, and 1.416.
  • 71
    • 33846968631 scopus 로고    scopus 로고
    • 2 = 0.9914.
    • 2 = 0.9914.
  • 72
    • 33846954903 scopus 로고    scopus 로고
    • 2 = 0.46 eV.
    • 2 = 0.46 eV.
  • 75
    • 33847000717 scopus 로고    scopus 로고
    • P is on a per mol of BPBR molecule basis with two spins for each molecule.
    • P is on a per mol of BPBR molecule basis with two spins for each molecule.
  • 76
    • 27544441189 scopus 로고    scopus 로고
    • For using Curie-Weiss law for impurities, see for example
    • (a) For using Curie-Weiss law for impurities, see for example: Belik, A. A.; Azuma, M.; Takano, M. Inorg. Chem. 2005, 44, 7523.
    • (2005) Inorg. Chem , vol.44 , pp. 7523
    • Belik, A.A.1    Azuma, M.2    Takano, M.3
  • 77
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    • Curie law can be used instead, where θ is approximated to be 0 if the residual χ(T)T coming from the paramagnetic impurity remains constant at low temperature.
    • (b) Curie law can be used instead, where θ is approximated to be 0 if the residual χ(T)T coming from the paramagnetic impurity remains constant at low temperature.
  • 84
    • 33847001061 scopus 로고    scopus 로고
    • Private communication
    • Johnston, D. C. Private communication, 2006.
    • (2006)
    • Johnston, D.C.1
  • 86
    • 33846983726 scopus 로고    scopus 로고
    • Earlier SQUID measurement of 1 provided a rather low value of -0.17 eV (ref 8b).
    • (b) Earlier SQUID measurement of 1 provided a rather low value of -0.17 eV (ref 8b).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.