Inorganic Exp 11

Inorganic Exp 11 - Experiment #11 Complex Ions: Symmetry...

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Experiment #11 Complex Ions: Symmetry and Spectra Chem 1312 Section: D1 Date Performed: April 5, 2006 Date Due: April 12, 2006 Submission Date: April 12, 2006
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Objective/Introduction: The d-orbitals of a free transition metal atom or ion all have the same energy. However, when transition metals form coordination complexes, the d-orbitals of the metal interact with the electron cloud of the ligands, so that the d-orbitals do not all have the same energy. The way in which the orbitals are split into different energy levels is dependent on the geometry of the complex. When the d-level is not completely filled, it is possible to promote and electron from a lower energy d-orbital to a higher energy d- orbital by absorption of a photon of electromagnetic radiation having an appropriate energy. Electromagnetic radiations in the visible region of the spectrum often possess the appropriate energy for such transitions (1). This lab deals with 4 different complex ions. Complex ions usually refer to cations in which surrounding water molecules have been replaced by some other electron pair donor. It is known that many transition metal complexes are very colored. The energy of the light being absorbed by these complexes, in addition to the intensity with which light is absorbed, varying according to many aspects such as the nature of the
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Inorganic Exp 11 - Experiment #11 Complex Ions: Symmetry...

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