Lecture 9 - Lecture 9 Special types of bonds Hydrogen...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 9: Special types of bonds Hydrogen bonding and other “weak interactions” H-bonding is a special case of a dipole-dipole interaction Responsible for the special properties of water and other liquids like antifreeze, maple syrup Responsible for the shapes of most of the important biological molecules like DNA, enzymes, cellulose, on and on There is a molecular orbital picture of hydrogen bonding. The molecular orbitals of the two interacting species can mix to make a new set of orbitals with slightly adjusted energies. Other kinds of dipole interactions include direct and induced electrostatic attractions. The weakest is the induced dipole-induced dipole interaction. In this case, the presence of a neighboring molecule causes a slight distortion in the electron clouds (and the molecular orbitals), resulting in a very small attraction. However, this is sufficient to make totally nonpolar species condense into liquids and solids at low enough temperatures.
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern