### 抄録

To understand the large nonlinear optical activities of azobenzene dendrons, which are dendritic macromolecules comprising donor-acceptor azobenzenes as branching units, we carried out ab initio calculations for azobenzene monomers, i.e., 4-dimethylamino-4′-carboxyazobenzene and 4-dimethylamino-2′-nitro-4′-carboxyazobenzene, and their dimers. We determined the stable structures and calculated the first hyperpolarizabilities, using the coupled-perturbed Hartree-Fock method. We found that two azobenzenes in the stable structure of each of the dimers have correlated orientations that produce a large overall dipole. The hyperpolarizabilities for the dimers were larger than those for the corresponding monomers. From these findings, we conclude that the poling of branching units by the interaction between azobenzene moieties within the azobenzene dendrons results in cone-shape structures that cause the large nonlinear optical activities.

元の言語 | 英語 |
---|---|

ページ（範囲） | 83-90 |

ページ数 | 8 |

ジャーナル | Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics |

巻 | 26 |

発行部数 | 1-3 |

出版物ステータス | 出版済み - 12 1 2000 |

外部発表 | Yes |

イベント | International Workshop on Molecular Design of Photonic Materials - Takarazuka, 日本 継続期間: 12 9 1999 → 12 10 1999 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Control and Systems Engineering
- Condensed Matter Physics

### これを引用

*Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics*,

*26*(1-3), 83-90.

**Ab initio calculations of first hyperpolarizabilities for donor-acceptor azobenzenes and their dimers.** / Okuno, Y.; Yokoyama, S.; Mashiko, S.

研究成果: ジャーナルへの寄稿 › Conference article

*Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics*, 巻. 26, 番号 1-3, pp. 83-90.

}

TY - JOUR

T1 - Ab initio calculations of first hyperpolarizabilities for donor-acceptor azobenzenes and their dimers

AU - Okuno, Y.

AU - Yokoyama, S.

AU - Mashiko, S.

PY - 2000/12/1

Y1 - 2000/12/1

N2 - To understand the large nonlinear optical activities of azobenzene dendrons, which are dendritic macromolecules comprising donor-acceptor azobenzenes as branching units, we carried out ab initio calculations for azobenzene monomers, i.e., 4-dimethylamino-4′-carboxyazobenzene and 4-dimethylamino-2′-nitro-4′-carboxyazobenzene, and their dimers. We determined the stable structures and calculated the first hyperpolarizabilities, using the coupled-perturbed Hartree-Fock method. We found that two azobenzenes in the stable structure of each of the dimers have correlated orientations that produce a large overall dipole. The hyperpolarizabilities for the dimers were larger than those for the corresponding monomers. From these findings, we conclude that the poling of branching units by the interaction between azobenzene moieties within the azobenzene dendrons results in cone-shape structures that cause the large nonlinear optical activities.

AB - To understand the large nonlinear optical activities of azobenzene dendrons, which are dendritic macromolecules comprising donor-acceptor azobenzenes as branching units, we carried out ab initio calculations for azobenzene monomers, i.e., 4-dimethylamino-4′-carboxyazobenzene and 4-dimethylamino-2′-nitro-4′-carboxyazobenzene, and their dimers. We determined the stable structures and calculated the first hyperpolarizabilities, using the coupled-perturbed Hartree-Fock method. We found that two azobenzenes in the stable structure of each of the dimers have correlated orientations that produce a large overall dipole. The hyperpolarizabilities for the dimers were larger than those for the corresponding monomers. From these findings, we conclude that the poling of branching units by the interaction between azobenzene moieties within the azobenzene dendrons results in cone-shape structures that cause the large nonlinear optical activities.

UR - http://www.scopus.com/inward/record.url?scp=0034438679&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034438679&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0034438679

VL - 26

SP - 83

EP - 90

JO - Nonlinear Optics Quantum Optics

JF - Nonlinear Optics Quantum Optics

SN - 1543-0537

IS - 1-3

ER -