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Rajashree Basu

19.2 Coordination Chemistry of Transition Metals - Chemistry - 0 views

opentextbc.ca/...chemistry-of-transition-metals

Chapter 13 - Periodic table transition metals

shared by Rajashree Basu on 28 Jul 20 - No Cached
  • The Naming of Complexes The nomenclature of the complexes is patterned after a system suggested by Alfred Werner, a Swiss chemist and Nobel laureate, whose outstanding work more than 100 years ago laid the foundation for a clearer understanding of these compounds. The following five rules are used for naming complexes:
    • Rajashree Basu
      Rajashree Basu on 28 Jul 20
       
      naming of complexes - very important strategy
  • Summary The transition elements and main group elements can form coordination compounds, or complexes, in which a central metal atom or ion is bonded to one or more ligands by coordinate covalent bonds. Ligands with more than one donor atom are called polydentate ligands and form chelates. The common geometries found in complexes are tetrahedral and square planar (both with a coordination number of four) and octahedral (with a coordination number of six). Cis and trans configurations are possible in some octahedral and square planar complexes. In addition to these geometrical isomers, optical isomers (molecules or ions that are mirror images but not superimposable) are possible in certain octahedral complexes. Coordination complexes have a wide variety of uses including oxygen transport in blood, water purification, and pharmaceutical use.
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  • Glossary bidentate ligand ligand that coordinates to one central metal through coordinate bonds from two different atoms central metal ion or atom to which one or more ligands is attached through coordinate covalent bonds chelate complex formed from a polydentate ligand attached to a central metal chelating ligand ligand that attaches to a central metal ion by bonds from two or more donor atoms cis configuration configuration of a geometrical isomer in which two similar groups are on the same side of an imaginary reference line on the molecule coordination compound substance consisting of atoms, molecules, or ions attached to a central atom through Lewis acid-base interactions coordination number number of coordinate covalent bonds to the central metal atom in a complex or the number of closest contacts to an atom in a crystalline form coordination sphere central metal atom or ion plus the attached ligands of a complex donor atom atom in a ligand with a lone pair of electrons that forms a coordinate covalent bond to a central metal ionization isomer (or coordination isomer) isomer in which an anionic ligand is replaced by the counter ion in the inner coordination sphere ligand ion or neutral molecule attached to the central metal ion in a coordination compound linkage isomer coordination compound that possesses a ligand that can bind to the transition metal in two different ways (CN− vs. NC−) monodentate ligand that attaches to a central metal through just one coordinate covalent bond optical isomer (also, enantiomer) molecule that is a nonsuperimposable mirror image with identical chemical and physical properties, except when it reacts with other optical isomers polydentate ligand ligand that is attached to a central metal ion by bonds from two or more donor atoms, named with prefixes specifying how many donors are present (e.g., hexadentate = six coordinate bonds formed) trans configuration configuration of a geometrical isomer in which two similar groups are on opposite sides of an imaginary reference line on the molecule
Rajashree Basu

Study Notes: Absorption of UV-Vis Radiation by Transition Metal Complexes - 0 views

simulab.ltt.com.au/...snAbsorpRadTransMetComp.htm

Periodic table transition metals Chapter 13

shared by Rajashree Basu on 28 Jul 20 - No Cached
  • When ligands bond to a transition metal ion to form a complex, electrons in the ligands and electrons in the five d orbitals of the metal ion repel each other. The net effect is that the energies of the d orbitals are raised, however they are split into two groups of differing energy.
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