TMStructure - Chemistry 3140 Advanced Inorganic Chemistry Transition Metal Complexes Structure and Spectra The next topic we will cover is our

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Chemistry 3140: Advanced Inorganic Chemistry Transition Metal Complexes: Structure and Spectra
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The next topic we will cover is our introduction to transition metal complexes, sometimes referred to as “classical coordination chemistry.” We will be covering pieces of Chapters 7, 19 and 20 simultaneously. Covalent bond vs. a coordinate covalent bond …
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Terms: ligand, inner sphere, outer sphere, complex ion … Covalent bond, coordinate covalent bond, ionic (or electrostatic) interaction …
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Main Group Metals vs Transition Metals There is a huge difference between the symbols Na + (aq) and Mn +2 (aq) . .. Sodium ion surrounded by water, attracted by electrostatic attraction Manganese ion, physically bonded to water
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Main Group Metals vs Transition Metals Just look at these samples of metal solutions across the third row of the periodic table . .. What trends do you see? Counting valence d electrons and orbital orders . .. Sc 2 O 3 TiO 2 VSO 4 NaCrO 4 MnCl 2 K 3 Fe(CN) 6 CoCl 2 Ni(NO 3 ) 2 CuSO 4 ZnSO 4
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3p 3s 4s 3d You know the conventional order we use when filling orbitals … And I’ve also mentioned how this ordering changes when you move from gas phase atoms to any molecule or ion … 4s 3d 3p 3s For the transition metals, the 3s and 3p orbitals are already filled. When counting d electrons, then, you start with the columns …
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For example, a Ti(0) atom in some compound is a d4 metal—it would have 4 d electrons. Ti(II), or Ti +2 , is a d2 metal. Ti(III) is a d1 … d electron counts for our solutions … Sc 2 O 3 TiO 2 VSO 4 Na 2 CrO 4 MnCl 2 K 3 Fe(CN) 6 CoCl 2 Ni(NO 3 ) 2 CuSO 4 ZnSO 4 Sc(III) Ti(IV) V(II) Cr(VI) Mn(II) Fe(III) Co(II) Ni(II) Cu(II) Zn(II) d0 d0 d3 d0 d5 d5 d7 d8 d9 d10
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Main Group Metals vs Transition Metals There’s the big difference: transition metals are found with other species bonded to them, held by both the ionic and covalent bonding. The most common species are any atom, ion or molecule featuring at least one lone pair of electrons . Ammonia and water are among the most common. Anything attached to the transition metal like this is known as a ligand .
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Main Group Metals vs Transition Metals Na + (aq) vs the more complete Mn(H 2 O) 6 +2 Technically, manganese(II) chloride should be written: [Mn(H 2 O) 6 ]Cl 2 Other common ligands: Cl - , the chloride ion CO, carbon monoxide en, ethylene diammine edta, ethylene diammine tetraacetic acid . .. N H 2 NH 2
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Ligands
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So, how are these things put together? The next question is: how does this work? That’s a two part question: what is the structure of a ligand/transition metal complex? What is the nature of the bonding between the two?
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Transition Metal Complexes are Everywhere … These questions are not trivial, for TM complexes turn up in lots of different places … Myoglobin and rasmol … select iron spacefill 250 color [250,250,0]
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Vitamin B12
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Heme
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Crystal Field Theory The first attempt to explain the spectra and magnetism of TM complexes.
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This note was uploaded on 06/02/2011 for the course PSYC 1101 taught by Professor Yanchus during the Spring '07 term at Georgia Southern University .

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TMStructure - Chemistry 3140 Advanced Inorganic Chemistry Transition Metal Complexes Structure and Spectra The next topic we will cover is our

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