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Molecular Interactions Issues to Study: Electrical Properties electrical dipole moments polarizability relative permittivity and refractive index Intermolecular Interactions interactions between dipoles repulsive interactions total interactions

e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

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Page 1: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Molecular Interactions

Issues to Study:

Electrical Propertieselectrical dipole momentspolarizabilityrelative permittivity and refractive index

Intermolecular Interactionsinteractions between dipolesrepulsive interactionstotal interactions

Page 2: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Electrical Dipole Moments

Page 3: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

1. Dipole moment의 크기는 분자구조와 어떤 연관성을 가지는가?2. 어떤 경우에 0이 되는가?3. 원자의 전기음성도(electronegativity)와의 관계는?

* Professor Linus Pauling

Page 4: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

구조적인 연관성 찾기

Page 5: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Polarizability, Relative Permittivity, Refractive Index

* Clausius-Mossotti equation의 이해

Page 6: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Dispersion of Refractive Index

1. Snell’s Law: incidence, reflection, refraction2. Total internal reflection의 이해3. Copper wire vs. Glass optic fiber vs. Plastic optic fiber

Page 7: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Interactions between Dipoles

Dipole간의 거리와 방향(orientation)

Page 8: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Pole의 개수와 거리와의 관계

Page 9: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Dipole-Dipole interaction(Keesom interaction)

Dipole-Induced dipole interaction(Debye interaction)

Induced dipole-Induced dipole interaction)(London interaction, Dispersion)

Total Van der Waals attractive interaction = Keesom + Debye + London

* Additional hydrogen-bonding can be considered.

Page 10: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

1. Dipole moment와 polarizability의 크기에 따른 VDW의 변화2. 각 분자의 특성에 따른 Keesom, Debye, London의 구성 비율3. London interaction의 중요성4. 물의 특이성

Page 11: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Overall Potential Energy

*Potential vs distance curve로 부터Force vs distance curve 도출

Page 12: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Various Models for Overall Potential

* 각 모델의 의미를 생각해 보고 수학적으로 표현하기

Page 13: e200301-101.ppt [호환 모드] - CHERIC · 2013. 12. 19. · relative permittivity and refractive index Intermolecular Interactions interactions between dipoles ... Table 21-2* Refractive

Lennard-Jones 12,6 Potential