logging in or signing up JAHN-TELLER EFFECT sarthakajmer Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 3319 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: May 21, 2010 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript JAHN-TELLER EFFECT : JAHN-TELLER EFFECT Introduction, theorem, tetragonal distortion INTRODUCTION : INTRODUCTION In 1937 Jahn and Teller put forward a theorem known as Jahn –Teller theorem. This explain why certain 6 coordinated complexes undergo distortion to assume distorted octahedral (i.e. tetragonal) geometry. REGULAR OCTAHEDRAL COMPLEXES : REGULAR OCTAHEDRAL COMPLEXES The 6 coordinated complexes in which all the 6 distances between the ligand and metal are equal are said to be regular /symmetrical octahedral complexes DISTORTED OCTAHEDRAL COMPLEXES : DISTORTED OCTAHEDRAL COMPLEXES The 6 coordinated complexes in which all the 6 distances between the ligand and metal are not equal are said to be distorted octahedral complexes JAHN TELLER THEOREM : JAHN TELLER THEOREM Any non liner molecular system possessing degenerated electronic state will be unstable and will undergo distortion to form a system of lower symmetry and lower energy and thus will remove degeneracy Z-OUT DISTORTION : Z-OUT DISTORTION Z-IN DISTORTION : Z-IN DISTORTION SYMMETRICAL AND UNSYMMETRICAL t2g : SYMMETRICAL AND UNSYMMETRICAL t2g The symmetrical t2g orbitals are t2g0, t2g3, t2g6 The unsymmetrical t2g orbitals are t2g 1,t2g 2,t2g4, t2g5 SYMMETRICAL AND UNSYMMETRICAL eg ORBITALS : SYMMETRICAL AND UNSYMMETRICAL eg ORBITALS The symmetrical eg orbitals are eg0, eg4, The unsymmetrical eg orbitals are eg1, eg3 The eg2 orbital is symmetrical when configuration is (dx2-y2)1(dz2)1and unsymmetrical when configuration is (dx2-y2)0(dz2)2 Slide 11: t2g(sym)+eg(sym)=No Distortion t2g(unsym)=Slight Distortion eg(unsym)=Strong Distortion You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.