Share
VIDEOS 1 TO 50
Bonding and Antibonding Molecular Orbitals
Bonding and Antibonding Molecular Orbitals
Published: 2013/04/09
Channel: AK LECTURES
Valence Bond Theory, Hybrid Orbitals, and Molecular Orbital Theory
Valence Bond Theory, Hybrid Orbitals, and Molecular Orbital Theory
Published: 2016/01/10
Channel: Professor Dave Explains
Boding Vs Anti bonding Molecular Orbital - Differences of Boding and Anti bonding Molecular Orbital
Boding Vs Anti bonding Molecular Orbital - Differences of Boding and Anti bonding Molecular Orbital
Published: 2017/01/20
Channel: siLLy comparison
Molecular Orbital Theory II: MO
Molecular Orbital Theory II: MO's of the H2 Molecule
Published: 2011/08/06
Channel: Ben's Chem Videos
Introduction to Molecular Orbital Theory
Introduction to Molecular Orbital Theory
Published: 2011/10/11
Channel: Scott Lawson
Molecular Orbital Theory Examples of Sigma and Pi Bonding
Molecular Orbital Theory Examples of Sigma and Pi Bonding
Published: 2015/09/10
Channel: Dr Jackson UGA Chemistry
Molecular Orbital Theory
Molecular Orbital Theory
Published: 2013/08/11
Channel: Soumitra Das
Orbitals: Crash Course Chemistry #25
Orbitals: Crash Course Chemistry #25
Published: 2013/08/05
Channel: CrashCourse
A Brief Introduction to Molecular Orbital Theory
A Brief Introduction to Molecular Orbital Theory
Published: 2013/04/16
Channel: ChemSurvival
Orbital Molecular Theory
Orbital Molecular Theory
Published: 2009/10/13
Channel: Manuel Moreira Baptista
Pupil Video: Bonding and Anti Bonding by Yifeng Zhu
Pupil Video: Bonding and Anti Bonding by Yifeng Zhu
Published: 2017/03/23
Channel: Leys Cambridge
s orbitals bonding & antibonding
s orbitals bonding & antibonding
Published: 2010/01/22
Channel: kwesiamoa
The Molecular Orbital Theory.
The Molecular Orbital Theory.
Published: 2016/12/01
Channel: Ali Hayek
Molecular Orbital Theory Chemistry
Molecular Orbital Theory Chemistry
Published: 2014/01/29
Channel: Yo Yo Honey Singh New HD
Molecular Orbital Theory, Bonding & Antibonding MO, Bond Order, Homonuclear Diatomic Molecules
Molecular Orbital Theory, Bonding & Antibonding MO, Bond Order, Homonuclear Diatomic Molecules
Published: 2017/10/26
Channel: The Organic Chemistry Tutor
Difference between Boding and Anti-bonding Molecular Orbital
Difference between Boding and Anti-bonding Molecular Orbital
Published: 2016/08/06
Channel: Difference Between
Tricks of Molecular Orbital Theory, Part-I (IITJEE Mains/Advance/AIIMS/NEET/XI/XII)
Tricks of Molecular Orbital Theory, Part-I (IITJEE Mains/Advance/AIIMS/NEET/XI/XII)
Published: 2016/06/05
Channel: Er Dushyant Kumar-B.tech,IIT Roorkee
The Pi MOs of Benzene and Hexatriene
The Pi MOs of Benzene and Hexatriene
Published: 2010/02/08
Channel: Michael Evans
Bonding and Antibonding Molecular Orbitals
Bonding and Antibonding Molecular Orbitals
Published: 2009/07/06
Channel: wolframmathematica
Lec 14, Physical Chemistry, Molecular Orbital Theory, Antibonding Orbitals
Lec 14, Physical Chemistry, Molecular Orbital Theory, Antibonding Orbitals
Published: 2013/11/19
Channel: Patterns Remonstrator
Anti bonding Molecular Orbital  Vs Boding  - Difference Between Anti bonding Molecular Orbital And B
Anti bonding Molecular Orbital Vs Boding - Difference Between Anti bonding Molecular Orbital And B
Published: 2017/02/25
Channel: MAD differences
Pi bonds and sp2 hybridized orbitals | Structure and bonding | Organic chemistry | Khan Academy
Pi bonds and sp2 hybridized orbitals | Structure and bonding | Organic chemistry | Khan Academy
Published: 2010/07/24
Channel: Khan Academy
Molecular orbital theory
Molecular orbital theory
Published: 2017/03/30
Channel: Dr. Goff
Introduction to molecular orbital theory
Introduction to molecular orbital theory
Published: 2016/03/03
Channel: Harun Mbuvi
Molecular Orbital Theory V:  Practice with Sigma and Pi MO
Molecular Orbital Theory V: Practice with Sigma and Pi MO's
Published: 2011/08/07
Channel: Ben's Chem Videos
Class 11/I PUC Chemistry  Episode-03 Formation of Anti bonding molecular orbital
Class 11/I PUC Chemistry Episode-03 Formation of Anti bonding molecular orbital
Published: 2014/09/05
Channel: Bangalore Institute of Coaching (BICPUC) - PUC Coaching
Molecular Orbital Theory
Molecular Orbital Theory
Published: 2014/04/21
Channel: ChemTutor BYU
Molecular Orbital Theory IV: Period 2 Homonuclear Diatomic Molecules
Molecular Orbital Theory IV: Period 2 Homonuclear Diatomic Molecules
Published: 2011/08/07
Channel: Ben's Chem Videos
3.11 Molecular Orbital Theory MOT
3.11 Molecular Orbital Theory MOT
Published: 2014/04/01
Channel: Gabbar Singh Tutorials - Chemistry
CHEMISTRY 101 - Molecular Orbital Theory
CHEMISTRY 101 - Molecular Orbital Theory
Published: 2017/09/21
Channel: Matthew Gerner
General Chemistry 1A. Lecture 14. Molecular Orbital Theory.
General Chemistry 1A. Lecture 14. Molecular Orbital Theory.
Published: 2013/03/08
Channel: UCI Open
Chemistry: Molecular orbital model (1)
Chemistry: Molecular orbital model (1)
Published: 2010/07/16
Channel: freelanceteach
Chemistry 4.10 Molecular Orbitals
Chemistry 4.10 Molecular Orbitals
Published: 2011/08/30
Channel: IsaacsTEACH
CHEM-XI-4-08 Molecular orbital theory (2017) Pradeep Kshetrapal Physics channel
CHEM-XI-4-08 Molecular orbital theory (2017) Pradeep Kshetrapal Physics channel
Published: 2017/08/24
Channel: Pradeep Kshetrapal
Molecular Orbital theory And bond order|| IIT_JAM_CHEMISTRY_||(CHEMICAL BONDING)(HINDI)
Molecular Orbital theory And bond order|| IIT_JAM_CHEMISTRY_||(CHEMICAL BONDING)(HINDI)
Published: 2016/12/25
Channel: IIT JAM CHEMISTRY
Molecular Orbital Theory BONDING & ANTI-BONDING ORBITALS
Molecular Orbital Theory BONDING & ANTI-BONDING ORBITALS
Published: 2017/08/30
Channel: SUPRATIM DAS
CHEMISTRY 101: Molecular Orbital Theory, Bond order, bond strength, magnetic properties
CHEMISTRY 101: Molecular Orbital Theory, Bond order, bond strength, magnetic properties
Published: 2015/11/07
Channel: Matthew Gerner
Quantum Chemistry 10.7 - Hydrogen Molecular Orbital Diagram
Quantum Chemistry 10.7 - Hydrogen Molecular Orbital Diagram
Published: 2016/08/14
Channel: TMP Chem
Molecular orbital theory. Non-bonding orbitals
Molecular orbital theory. Non-bonding orbitals
Published: 2017/03/27
Channel: Diego Troya
distinguish between bonding and anti bonding molecular orbitals (parojani)
distinguish between bonding and anti bonding molecular orbitals (parojani)
Published: 2017/10/01
Channel: Aamir saleem Bughlani
Quantum Chemistry 10.8 - LCAO-MO Theory
Quantum Chemistry 10.8 - LCAO-MO Theory
Published: 2016/08/14
Channel: TMP Chem
Formation of Molecular Orbitals
Formation of Molecular Orbitals
Published: 2015/10/28
Channel: CBSE
What’s the difference between atomic and molecular orbitals
What’s the difference between atomic and molecular orbitals
Published: 2015/04/15
Channel: Clutch Prep
Molecular Orbital Theory vs Valence Bond
Molecular Orbital Theory vs Valence Bond
Published: 2015/09/07
Channel: Dr Jackson UGA Chemistry
Conjugated pi molecular orbitals (1)
Conjugated pi molecular orbitals (1)
Published: 2009/08/02
Channel: freelanceteach
Conjugated Molecular Orbitals of 1,3 Butadiene
Conjugated Molecular Orbitals of 1,3 Butadiene
Published: 2014/06/05
Channel: AK LECTURES
Chemistry: Molecular orbital model (11)
Chemistry: Molecular orbital model (11)
Published: 2010/07/16
Channel: freelanceteach
A Brief Introduction to Molecular Orbitals - Hydrogen, Helium, NItrogen and Oxygen
A Brief Introduction to Molecular Orbitals - Hydrogen, Helium, NItrogen and Oxygen
Published: 2013/11/14
Channel: ChemSurvival
Chemistry: Molecular orbital model (2)
Chemistry: Molecular orbital model (2)
Published: 2010/07/16
Channel: freelanceteach
PCAT: Formation of Molecular Orbitals in H2 Molecule
PCAT: Formation of Molecular Orbitals in H2 Molecule
Published: 2015/04/07
Channel: Master the Content
NEXT
GO TO RESULTS [51 .. 100]

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
  (Redirected from Antibonding)
Jump to: navigation, search
H2 1sσ* antibonding molecular orbital

In chemical bonding theory, an antibonding orbital is a type of molecular orbital (MO) that weakens the bond between two atoms and helps to raise the energy of the molecule relative to the separated atoms. Such an orbital has one or more nodes in the bonding region between the nuclei. The density of the electrons in the orbital is concentrated outside the bonding region and acts to pull one nucleus away from the other and tends to cause mutual repulsion between the two atoms.[1][2]

Diatomic molecules[edit]

Antibonding molecular orbitals (MOs) are normally higher in energy than bonding molecular orbitals. Bonding and antibonding orbitals form when atoms combine into molecules. If two hydrogen atoms are initially far apart, they have identical atomic orbitals. However, as the spacing between the two atoms becomes smaller, the electron wave functions begin to overlap. The Pauli exclusion principle prohibits any two electrons in a molecule from having the same set of quantum numbers. Therefore each original atomic orbital of the isolated atoms (for example, the ground state energy level, 1s) splits into two molecular orbitals belonging to the pair, one lower in energy than the original atomic level and one higher. The orbital which is lower than the orbitals of the separate atoms is the bonding orbital, which is more stable and promotes the bonding of the two H atoms into H2. The higher-energy orbital is the antibonding orbital, which is less stable and opposes bonding if it is occupied. In a molecule such as H2, the two electrons normally occupy the lower-energy bonding orbital, so that the molecule is more stable than the separate H atoms.

He2 electron configuration. The four electrons occupy one bonding orbital at lower energy, and one antibonding orbital at higher energy than the atomic orbitals.

A molecular orbital becomes antibonding when there is less electron density between the two nuclei than there would be if there were no bonding interaction at all. When a molecular orbital changes sign (from positive to negative) at a nodal plane between two atoms, it is said to be antibonding with respect to those atoms. Antibonding orbitals are often labelled with an asterisk (*) on molecular orbital diagrams.

In homonuclear diatomic molecules, σ* (sigma star) antibonding orbitals have no nodal planes passing through the two nuclei, like sigma bonds, and π* (pi star) orbitals have one nodal plane passing through the two nuclei, like pi bonds. The Pauli exclusion principle dictates that no two electrons in an interacting system may have the same quantum state. If the bonding orbitals are filled, then any additional electrons will occupy antibonding orbitals. This occurs in the He2 molecule, in which both the 1sσ and 1sσ* orbitals are filled. Since the antibonding orbital is more antibonding than the bonding orbital is bonding, the molecule has a higher energy than two separated helium atoms, and it is therefore unstable.

Polyatomic molecules[edit]

Butadiene pi molecular orbitals. The two colors show opposite signs of the wavefunction.

In molecules with several atoms, some orbitals may be delocalized over more than two atoms. A particular molecular orbital may be bonding with respect to some adjacent pairs of atoms and antibonding with respect to other pairs. If the bonding interactions outnumber the antibonding interactions, the MO is said to be bonding, whereas, if the antibonding interactions outnumber the bonding interactions, the molecular orbital is said to be antibonding.

For example, butadiene has pi orbitals which are delocalized over all four carbon atoms. There are two bonding pi orbitals which are occupied in the ground state: π1 is bonding between all carbons, while π2 is bonding between C1 and C2 and between C3 and C4, and antibonding between C2 and C3. There are also antibonding pi orbitals with two and three antibonding interactions as shown in the diagram; these are vacant in the ground state, but may be occupied in excited states.

Similarly benzene with six carbon atoms has three bonding pi orbitals and three antibonding pi orbitals. Since each carbon atom contributes one electron to the π-system of benzene, there are six pi electrons which fill the three lowest-energy pi molecular orbitals (the bonding pi orbitals).

Antibonding orbitals are also important for explaining chemical reactions in terms of molecular orbital theory. Roald Hoffmann and Kenichi Fukui shared the 1981 Nobel Prize in Chemistry for their work and further development of qualitative molecular orbital explanations for chemical reactions.

References[edit]

  1. ^ Atkins P. and de Paula J. Atkins Physical Chemistry. 8th ed. (W.H. Freeman 2006), p.371 ISBN 0-7167-8759-8
  2. ^ Miessler G.L. and Tarr D.A., Inorganic Chemistry 2nd ed. (Prentice-Hall 1999), p.111 ISBN 0-13-841891-8

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license