bioex_lect27

bioex_lect27 - MIT OpenCourseWare http/ocw.mit.edu 5.111...

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MIT OpenCourseWare http://ocw.mit.edu 5.111 Principles of Chemical Science Fall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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Transition Metals and Coordination Complexes See pages 2 and 3 of lecture 27 notes for an introduction to coordination complexes. See page 5 of lecture 27 notes for a discussion of geometric isomers. Chelate Effect in Coordination Complexes: Ligands that bind a metal at one site are called unidentate or monodentate (one tooth). Ligands that have two or more points of attachment to the metal are called chelating ligands and the coordination complexes are called chelates (greek for claws). Bidentate – two points of attachment Tridentate – three points of attachment Tetradentate – four points of attachment (ex. corrin ring of vitamin B 12 ) Hexadentate – six points of attachment (ex. EDTA) Metal chelates are unusually stable. This is partly due to the favorable entropic factor accompanying release of non-chelating ligands (usually H
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bioex_lect27 - MIT OpenCourseWare http/ocw.mit.edu 5.111...

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