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Examples of ligands

Outline. Book 1, chapter 6p Ligandsp donorsp acceptorsExamples of ligandsCON2NOPhosphinesOlefinsMetal-metal bonds. 2. p donors and p acceptors. 3. Types of metal-ligand interactions. Sigma (s) donor ligands Pi (p) donor ligandsPi (p) acceptor ligands. These ligands also act as s donors..

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Examples of ligands

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    1. Examples of ligands

    2. Outline Book 1, chapter 6 p Ligands p donors p acceptors Examples of ligands CO N2 NO Phosphines Olefins Metal-metal bonds 2

    3. p donors and p acceptors 3

    4. Types of metal-ligand interactions Sigma (s) donor ligands Pi (p) donor ligands Pi (p) acceptor ligands 4

    5. CO as a ligand 5

    6. Bonding in CO complexes 6

    7. Experimental support for backdonation 7 X-ray: in (C5H5)Mo(CO)3Me, M-C is 2.38 , M=CCO is 1.99 (>0.07 ) IR, n(CO): free CO, 2149 cm-1 H3B-CO, 2178 cm-1 Cr(CO)6, 2000 cm-1 V(CO)6-, 1860 cm-1 Mn(CO)6+, 2090 cm-1 Cr(tren)(CO)3, 1880 cm-1 (tren = H2NCH2CH2NHCH2CH2NH2)

    8. Dinitrogen complexes: binding and reactivity First dinitrogen complex: Allen, A. D.; Senoff, C. W. 1965 N2 is a weaker donor and acceptor than CO. N2 activation: biological fixation and ammonia production. N=N bond is relatively inert (225 kcal/mol). 8

    9. Nitrosyl (NO) complexes: binding Two different coordination modes 9

    10. Phosphine ligands: bonding 10

    11. Monodentate phosphines: cone angles 11

    12. Bonding in alkene complexes

    13. Two bonding extremes

    14. Characterization

    15. Metal-metal bonding 15

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