1 / 15

F.6 Chemistry Project Dipole-dipole interaction and its application

F.6 Chemistry Project Dipole-dipole interaction and its application. Fung Chun Yu (8) Kwok Chun Nga (9) Chan Wai Sum (5). Introduction. What is dipole-dipole interaction? The difference in electronegativities between elements in a covalent bond produces a certain degree of polarization

keene
Download Presentation

F.6 Chemistry Project Dipole-dipole interaction and its application

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. F.6 Chemistry ProjectDipole-dipole interaction and its application Fung Chun Yu (8) Kwok Chun Nga (9) Chan Wai Sum (5)

  2. Introduction • What is dipole-dipole interaction? • The difference in electronegativities between elements in a covalent bond produces a certain degree of polarization • The electron cloud is distorted, and a dipole is produced

  3. Introduction • What is dipole-dipole interaction? • example can be seen in hydrogen chloride (HCl) • Cl, being more electronegative, pulls the electron cloud towards it  Distortion of electron cloud • The positive end attracts the negative end  the molecules are packed regularly in a head-to- tail fashion

  4. Introduction An illustration of the head-to-tail arrangement of molecules due to dipole-dipole interaction

  5. Introduction An extraordinarily simple animation showing the interaction between HCl molecules

  6. Application of dipole-dipole interaction • LCD • Biological field

  7. Liquid Crystal Display • consists of two sheets of polarizing material with a liquid crystal solution in between • can be orientated into a a desired direction under current. • light will be polarized by this pattern Why can the liquid crystal be arranged by electricity?

  8. Liquid Crystal Display • liquid crystal molecule used is introduced below • Methoxybenzilidene Butylanaline (MBBA) • p-decyloxybenzylidene p'-amino 2-methylbutylcinnamate (DOBAMBC)

  9. Liquid Crystal Display • The molecules are dipoles • they twist the plane of polarization originally • They are aligned regularly in a head-to-tail fashion as mentioned above when electric field is applied • formed a polaroid • light is then blocked

  10. Biological Field • Molecular arrangement of protein There are four levels of protein structure • Primary level arrangement of amino acid • Secondary structure  helical coiling of the peptide

  11. Biological Field • Tertiary structure  spatial relationship of different secondary structures  • Quaternary structure How can we stabilize the protein structure???

  12. Biological Field • Polypeptide is a long chain molecule • Dipole is present in polypeptide • Interactions including Dipole – dipole interaction stabilize the structure

  13. Biological Field • Example: Haemoglobin • Consists of four protein subunits + haem molecule • Formation of haemoglobin involved dipole-dipole interaction • Dipole-dipole interaction allow the haemoglobin to take its final shape

  14. Acknowledgement • Wikipedia (http://en.wikipedia.org/ • http://www.gullwinguk.com • http://bucarotechelp.com/computers/anatomy/91060003.asp

  15. The End

More Related