lect17_ch24b

lect17_ch24b - Polydentate Ligands & Nomenclature...

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Unformatted text preview: Polydentate Ligands & Nomenclature Chapter 24 – Lecture 2 Chapter Cm he istry 123 S pring 2008 Dr. Woodward Chelating (Polydentate) Ligands Chelating Porphyrins Porphyrins Porphine (C20H14N4) Myoglobin & Hemoglobin Chlorophyll Chlorophyll Rules for Naming Coordination Compounds Compounds 1. For ionic compounds the cation comes before the anion. 2. For the complex ion part (within brackets) the ligands are listed in alphabetical order before the metal. 3. Anionic ligands end in the letter o, neutral ligands retain their names (NH3 = ammine, H2O = aqua). Cl− = chloro Br− = bromo I− = iodo OH− = hydroxo CN− = cyano O2− = oxo 1. Greek prefixes are used to indicate the number of ligands (different prefixes are used if the ligand itself has one of these prefixes). 2 = di 3 = tri 4 = tetra 5 = penta 6 = hexa 2 = bis 3 = tris 4 = tetrakis (alternate prefixes) 1. If the complex ion has a negative charge it ends in ate. 2. The oxidation number of the metal is given in parentheses in roman numerals. C olor: CrO4- & C hrom S ate alts 1.2 5 conc. CrO42solution SrCrO4 1.0 PbCrO4 0.4 3 2 1 0.2 0.0 250 300 350 400 450 500 550 600 650 0 700 wavelength (nm) SrCrO4 behaves much like a concentrated CrO42- solution. Sr2+ ions have little effect on the electronic absorption, whereas Pb2+ ions shift the absorption edge to lower energy (longer wavelengths). 4 dilute CrO42solution absorbance (SrCrO , PbCrO ) 0.6 absorbance (CrO ) 4 0.8 2- 4 4 ...
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This note was uploaded on 06/03/2011 for the course CHM 123 taught by Professor Woodward during the Spring '08 term at Ohio State.

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lect17_ch24b - Polydentate Ligands & Nomenclature...

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