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Polydentate Ligands & Nomenclature Chapter 24 – Lecture 2

Polydentate Ligands & Nomenclature Chapter 24 – Lecture 2. Chemistry 123 Spring 2008 Dr. Woodward. Chelating (Polydentate) Ligands. Porphyrins. Porphine (C 20 H 14 N 4 ). Myoglobin & Hemoglobin. Chlorophyll. Rules for Naming Coordination Compounds.

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Polydentate Ligands & Nomenclature Chapter 24 – Lecture 2

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  1. Polydentate Ligands & Nomenclature Chapter 24 – Lecture 2 Chemistry 123 Spring 2008 Dr. Woodward

  2. Chelating (Polydentate) Ligands

  3. Porphyrins Porphine (C20H14N4) Myoglobin & Hemoglobin

  4. Chlorophyll

  5. Rules for Naming Coordination Compounds • For ionic compounds the cation comes before the anion. • For the complex ion part (within brackets) the ligands are listed in alphabetical order before the metal. • 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 • 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) • If the complex ion has a negative charge it ends in ate. • The oxidation number of the metal is given in parentheses in roman numerals.

  6. Color: CrO4- & Chromate Salts 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).

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