IUB CHEM-C 118 - 11-12 chappter 22 (20 pages)

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11-12 chappter 22



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11-12 chappter 22

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Pages:
20
School:
Indiana University, Bloomington
Course:
Chem-C 118 - Principles of Chemistry and Biochemistry Ii
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Clicker Question Which is not possible 1 Linkage isomerism in tetrahedral coordination compounds 2 Linkage isomerism in octahedral coordination compounds 3 Geometrical isomerism in octahedral coordination compounds 4 Optical isomerism in square planar coordination compounds 5 Optical isomerism in octahedral coordination compounds 22 Coordination Chemistry 22 1 Properties of the Transition Elements 22 2 Iron and Steel The Use of Pyrometallurgy 22 3 Copper A Coinage Metal 22 4 Silver and Gold The Other Coinage Metals 22 5 Chromium 22 6 Coordinate Covalent Bonds 22 7 Crystal Field Theory Wednesday Wednesday November November 12 12 2014 2014 Read Read Section Section 22 7 22 7 for for Wednesday Wednesday Sections Sections 22 7 22 7 for for Friday Friday End End of of Chapter Chapter 22 22 Problems Problems 8 8 14 14 16 16 18 18 20 20 21 21 22 22 26 26 28 28 30 30 32 32 34 34 36 36 38 38 40 40 42 42 44 44 46 46 48 48 50 50 52 52 54 54 56 56 58 58 60 60 62 62 63 63 65 65 67 67 73 73 75 75 77 77 78 78 79 79 83 83 85 85 91 91 Coordination Compounds Life 2 Heme carries Fe2 in myoglobin and hemoglobin 1 heme myoglobin and 4 hemes hemoglobin Coordination Compounds Life Vitamin B12 6 coord Co ion bound to a heme ligand Only known dietary use of cobalt but it is absolutely essential Finding the Metal d electron count Take into account the charges of any counter ions Determine which ligands are neutral and which are charged anionic to determine ox state d count valance electrons oxidation state NOT dependent on isomers Crystal Field Theory Orbital view pay attention to axis labels Crystal Field Theory e pairs on the ligands create an electrostatic field Crystal Field Theory This field interacts with the metal ion d orbitals In an octahedral complex CNCN Fe 2 3dz 2 CNCN CNCN 3dyz 3dxy 3dxz 3dx2 y 2 Along the x y z axes Between axes Ligands lie along the x y and z axes The two types of d orbitals have different E in this field Octahedral Crystal Field The metal d orbitals split into two sets e and t2 The energy gap o octahedral crystal field splitting energy Tetrahedral and square planar have different splitting patterns Octahedral Electron Configurations CN NO2 en NH3 NCS H2O F Clstrong field weak field decreasing o Strong field ligands Large o Low spin complex Weak field ligands Small o High spin complex Octahedral Electron Configurations The size of o depends upon the ligands CN NO2 en NH3 NCS H2O F Clstrong field weak field decreasing o d 1 d 2 and d 3 e e e t2 t2 t2 d 4 varies e e t2 strong field ligands large o weak field ligands small o t2 Octahedral Electron Configurations d 6 configurations e e t2 t2 High spin complex small o Low spin complex large o Explain why Hexaaquairon II complex is paramagnetic Hexacyanoiron II is diamagnetic Octahedral Electron Configurations How many unpaired electrons are in the following octahedral ion Co CN 6 31 0 2 2 3 4 Square Planar Crystal Field How can we form a square planar complex Begin to remove ligands along z axis Once completely removed square planar As we remove the ligands on the zaxis what happens to the energy of each d orbital Square Planar Crystal Field The metal d orbitals split from the octahedral diagram to form the crystal field splitting diagram for square planar Square planar geometry is common for d8 and d9 metal complexes Square Planar Crystal Field How many unpaired electrons would be in a square planar Pt2 metal complex 1 2 3 4 0 1 2 3 Tetrahedral Crystal Field In an tetrahedral complex Ligands lie between the x y and z axes Tetrahedral Crystal Field The metal d orbitals split into two sets e and t2 The energy gap T tetrahedral crystal field splitting energy Notice that the energy levels are opposite of octahedral since ligands approach between the axes Tetrahedral Crystal Field Orbital filling in a tetrahedral crystal field d3 d5 T is much smaller than o Tetrahedral molecules are always high spin d7 Tetrahedral Crystal Field How many unpaired electrons would be in a tetrahedral Pt2 metal complex 1 2 3 4 0 1 2 3


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