PDF-Module 9 : Complexes of bound ligands Lecture 2 : Metal allyl and diene

Objectives In this lecture you will learn the following The metalallyl complexes The metaldiene complexes The metalcyclobutadiene complexes The respective metalligand interactionsThe allyl lig. The metal olefin bonding interactions The synthesis and reactivities of the metal olefin complexes The umpolung reactivities of olefins in the metal alkene complexes Though the first metal olefin complex dates back a long time to the beginning of 19 Splitting of d energy levels in the formation of an octahedral complex ion. (t. 2g. ). (. e. g. ). 0.6 . Δ. o. 0.4 . Δ. o. Crystal Field Theory: Octahedral Complexes. (. bary. center). (vacuum). metal ion in a spherical. Coordination Complexes. d. -block. elements a.k.a. . transition metals. d. -block elements are: . all . metals. all have . partially filled . d. subshells. exhibit horizontal & vertical . similarities. CONTENTS. Introduction. Coordination . Compounds. Concept of Ligands. Werner’s. . Theory. Effective Atomic Number. Isomerism . in Coordination. . Compounds. INTRODUCTION. Coordination compounds are the inorganic salts formed by the combination of two or more simple compounds in stoichiometric ratio.. Why is:. Mn. 2+. (. aq. ) colorless. Cu. 2+. (. aq. ) less deeply blue colored than Cu(NH. 3. ). 4. 2+. Zn. 2+. (. aq. ) colorless. MnO. 4. -. deeply colored. W(CO). 6. colorless. Sigma Interaction Strength. All associated species are dissolved. None remain . electrostatically. effective. Ligand. – the anion or neutral molecule that combines with a cation to form a complex. Can be various species. E.g., H. Why is:. Mn. 2 . (. aq. ) colorless. Cu. 2 . (. aq. ) less deeply blue colored than Cu(NH. 3. ). 4. 2 . Zn. 2 . (. aq. ) colorless. MnO. 4. -. deeply colored. W(CO). 6. colorless. Sigma Interaction Strength. Instructor: Dr. Upali Siriwardane e-mail: upali@latech.edu Office: CTH 311 Phone 257-4941 Office Hours: M,W 8:00-9:00 & 11:00-12:00 am; Tu,Th , F 9:30 - 11:30 a.m . April 7 , 2015: Test 1 (Chapters 1,  2, 3) Phosphine complexes Lecture 12a In order to understand what a ligand does, one has to look at its electronic and its steric properties The reaction conditions (kinetic and thermodynamic control ) during the reaction determine the configuration Lability. &Inertness Of Complexes. In order to understand the . Thermodynamic Terms. : Stable &Unstable. and the . Kinetic Terms: . Labile & Inert. , consider the following . cyano. complexes. Introduction. Coordination . Compounds. Concept of Ligands. Werner’s. . Theory. Effective Atomic Number. Isomerism . in Coordination. . Compounds. INTRODUCTION. Coordination compounds are the inorganic salts formed by the combination of two or more simple compounds in stoichiometric ratio.. . are those addition molecular compounds which retain their identity in solid state as well as in dissolved state. In these compounds the central metal atom or ion is linked by ions or molecules with coordinate bonds. e.g., Potassium . Two or more different compounds having the same molecular formula are called isomers and the phenomenon is called isomerism. Isomerism arises due to specific spatial dispositions of the atoms in a molecule. Due to covalence of M-L bonds, many types of isomers occur in co-ordination compounds. However, compared to organic compounds, relatively few inorganic compounds exhibit isomerism. . Transition . Metal Complexes Supported by . Multidentate . Amidine-Based Ligands. . T. C. Jones. , . S. A. Bender. , M. . J. Carney, J. A. Halfen, B. L. Small. †. , . and O. L. Sydora. †. Department of Chemistry, University of Wisconsin-Eau Claire, Eau Claire, Wisconsin 54702 and .