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Chemistry 142 Chapter 24: Transition Metals and Coordination Compounds Outline I.Properties of Transition Metals II.Coordination Compounds III.Structure.

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Presentation on theme: "Chemistry 142 Chapter 24: Transition Metals and Coordination Compounds Outline I.Properties of Transition Metals II.Coordination Compounds III.Structure."— Presentation transcript:

1 Chemistry 142 Chapter 24: Transition Metals and Coordination Compounds Outline I.Properties of Transition Metals II.Coordination Compounds III.Structure and Isomers IV.Nomenclature V.Bonding VI.Applications

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3 Properties

4 Expanded Periodic Table

5 Density Melting Point

6 Tro, Chemistry: A Molecular Approach 6 Atomic Size

7 Ionization Energy Tro, Chemistry: A Molecular Approach7

8 Electronegativity Tro, Chemistry: A Molecular Approach8

9 Oxidation States Tro, Chemistry: A Molecular Approach9

10 Oxidation States of Mn Mn 2+ (aq), Mn(OH) 3 (s), MnO 2 (s), MnO 4 2– (aq), MnO 4 – (aq)

11 Relative Reducing Abilities of First Row Transition Metals in Aqueous Solution reducing ability Half-ReactionPotential (V) Sc (s) Sc 3+ (aq) + 3 e Ti (s) Ti 2+ (aq) + 2 e V (s) V 2+ (aq) + 2 e Mn (s) Mn 2+ (aq) + 2 e Cr (s) Cr 2+ (aq) + 2 e Zn (s) Zn 2+ (aq) + 2 e Fe (s) Fe 2+ (aq) + 2 e Co (s) Co 2+ (aq) + 2 e Ni (s) Ni 2+ (aq) + 2 e Cu (s) Cu 2+ (aq) + 2 e

12 Lanthanide Contraction

13 Complex Ion

14 Tro, Chemistry: A Molecular Approach 14 Coordination Compound

15 Tro, Chemistry: A Molecular Approach 15 Geometries in Complex Ions

16 Ligands

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18 Chelates [Co(en) 3 ] 3+ [Co(EDTA)] -

19 Tro, Chemistry: A Molecular Approach 19 Complex Ions with Polydentate Ligands

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22 Tro, Chemistry: A Molecular Approach 22 Linkage Isomers

23 Geometric Isomers: Cis-Trans Square Planar Complex [Pt(NH 3 ) 2 Cl 2 ] diamminedichloroplatinum(II)

24 Geometric Isomers: Cis-Trans Octahedral Complexes [Co(NH 3 ) 4 Cl 2 ]Cl

25 Geometric Isomers: Cis-Trans Octahedral Complex [Co(NH 3 ) 4 Cl 2 ] + tetraamminedichlorocobalt(II)

26 Geometric Isomers: Mer-Fac Octahedral Complex [Co(NH 3 ) 3 Cl 3 ] triamminetrichlorocobalt(II)

27 Structure of Coordination Compounds 22.4

28 Structures of [Co(en) 3 ] 3+ and [Co(NH 3 ) 6 ] 3+

29 Valence Bond Theory

30 Tro, Chemistry: A Molecular Approach 30

31 Color & Electrons

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34 Tro, Chemistry: A Molecular Approach 34 Strong and Weak Field Splitting

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36 Crystal Field Theory

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38 Example – Coordination Chemistry Compare the strong field case of hexaamminecobalt(III) ion to the weak field case of hexafluorocobaltate(III) ion. a)What is the oxidation state of each cobalt? b)What do the orbital diagrams look like? c)Are they high spin, low spin or neither? d)What are the hybridized orbitals?

39 Example – Coordination Chemistry The hexacyanoferrate(III) ion is known to have one unpaired electron. Does the cyanide ion produce a strong or weak field?

40 Example – Coordination Chemistry Predict the number of unpaired electrons in the complex ion hexacyanochromate(II).

41 Example – Coordination Chemistry The complex ion hexaaquatitanium(III) absorbs light of wavelength 510 nm and has a reddish-violet color. What is the ligand field splitting in the complex?

42 Crystal Field Theory Tetrahedral and Square Planar Complexes

43 Example – Coordination Chemistry One method for refining cobalt involves the formation of the complex ion tetrachlorocobaltate(II). This anion is tetrahedral. Is this complex paramagnetic or diamagnetic?

44 Example – Coordination Chemistry Why is it that the tetracyanonickelate(II) ion is diamagnetic, but the tetrachloronickelate(II) ion is paramagnetic?

45 Applications of Coordination Compounds porphyrin Tro, Chemistry: A Molecular Approach45 chlorophyll porphryin

46 Tro, Chemistry: A Molecular Approach 46 Applications of Coordination Compounds carbonic anhydrase cisplatin anticancer drug


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