coordination_complexes - CHEM 1311A Syllabus Transition...

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CHEM 1311A Syllabus Transition metals and Coordination Chemistry Introduction to coordination compounds; stereochemistry, isomerism and nomenclature Coordination compounds: bonding models and energetics Coordination compounds: equilibria and substitution reactions Bioinorganic chemistry Fourth Exam – Friday, April 17
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What do these have in common? Hemoglobin Myoglobin Automobile paints Anti-cancer drugs (some) Industrial catalysts (many) Arthritis drugs Vitamin B 12 Cytochromes “Blue blood” Ferredoxins Rubies Emeralds Legumes (nitrogen fixers) Radiopharmaceuticals (some) MRI contrast agents All contain a transition metal!! All are coordination compounds Many are colored
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Transition metal complex (coordination compound) terminology Coordination compound, coordination complex, complex - a compound containing a metal ion and appended groups, which are Lewis bases and may be monatomic or polyatomic, neutral or anionic. Ligand - Lewis base bonded (coordinated) to a metal ion in a coordination complex. Those with only one point of attachment are monodentate ligands. Ligands that can be bonded to the metal through more than one donor atom are termed bidentate (two points of attachment), tridentate, etc. Such ligands are termed chelating ligands.
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Some examples of ligands (with abbreviations) NN NH 2 NH 2 SCH 3 SCH 3 C C O - O O O - O O - PR 2 PR 2 H 2 N N NH 2 H N NH 2 NH 2 H 2 N H 2 N S NH 2 O - - O H H H H N N CO 2 - CO 2 - - O 2 C - O 2 C I - Br - Cl - F - OH - H 2 O SCN - NH 3 NO 2 - PR 3 P(OR) 3 C 2 H 4 PF 3 CO CN - bipy en acac ox R = Ph, diphos R = Me, dmpe dien EDTA tren salen cyclam HN NH 2 HN NH 2 trien
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Transition metal complex (coordination compound) terminology Coordination number - number of ligands coordinated to a metal ion, 2-12. Coordination geometry or stereochemistry (octahedral, tetrahedral, square planar) - geometrical arrangements of ligands (donor groups) about a metal ion.
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Examples of coordination complexes PPh 3 Ni PPh 3 Br Br PPh 3 Ni PPh 3 Cl Cl Ni Cl PEt 3 Cl Et 3 P
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Comparison of space filling models of triphenylphosphine, P(C 6 H 5 ) 3 = PPh 3 , and triethylphosphine, P(CH 2 CH 3 ) 3 = PEt 3 Space filling models depict Van der Waals radii for atoms and reflect the effect volume that they occupy
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Effect of coordination number and geometry on absorption spectrum Comparison of electronic absorption spectra for [Co(OH 2 ) 6 ] 2+ (octahedral) and [CoCl 4 ] 2- (tetrahedral)
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Examples of coordination complexes H 2 N H 2 N Ni NH 2 N NN H 2 H 2 H 2 2+ OH 2 Ni OH 2 H 2 O OH 2 OH 2 H 2 O 2+ 3+ H 2 N H 2 N Co NH 2 N H 2 H 2 H 2
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Effect of ligand on absorption spectra (and color)
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Formulas/structures of some Pt(II) complexes Composition No. ions Today’s formulation PtCl 2 ·4NH 3 3[ P t ( N H 3 ) 4 ]Cl 2 PtCl 2 ·3NH 3 2[ P t ( N H 3 ) 3 Cl]Cl PtCl 2 ·2NH 3 0 cis -[Pt(NH 3 ) 2 Cl 2 ] trans -[Pt(NH 3 ) 2 Cl 2 ] PtCl 2 ·NH 3 ·KCl 2 K[Pt(NH 3 )Cl 3 ] PtCl 2 ·2KCl 3 K 2 [PtCl 4 ]
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Transition metal complex (coordination compound) terminology Isomers
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This note was uploaded on 05/23/2011 for the course CHEMISTRY 1311 taught by Professor Cox during the Spring '10 term at Georgia Institute of Technology.

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coordination_complexes - CHEM 1311A Syllabus Transition...

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