EXPERIMENT 11: PREPARATION OF COORDINATION COMPLEXES AND THESPECTROCHEMICALSERIE

Question

EXPERIMENT 11: PREPARATION OF COORDINATION COMPLEXES AND THESPECTROCHEMICALSERIES Name Instructor: Date: Pre-Lab Questions (Turn in to your Instructor before the laboratory period starts.) 1. Define the following terms. Make certain your meaning is clear a. Ligand b. Coordinate covalent (dative) bond 2. Use the color wheel provided in the discussion to answer the following questions: One of the complexes you make is a bright green. What wavelength of light is being absorbed to make the complex appear this color? a. b. Another complex (same metal ion) is bright yellow. What wavelength of light is being absorbed to make the complex appear this color? Which complex contains the stronger field ligand? Explain your reasoning. c.

Explanation / Answer

a) A Ligand is an ion or molecule that binds to a central metal atom to form a complex.Ligands are usually thought of as electron donors attracted to the metal at the center of the complex.Metals are electron acceptors. Ligands may be neutral or negatively charged species with electron pairs available.Water is a common ligand.

b)Ligands are considered Lewis bases because they are sharing their electron pairs with the metal ion. As you may recall, metal ions are always positive, so they are quite attractive to lone pairs of electrons. The resulting bond between the metal ion and the ligands are known as coordinate covalent bonds.

2. a) A complex that appears bright green will absorb light that is red, which is roughly 680nm from the color wheel.

b) A comples that appears bright yellow will absorb light that is violet, which has wavelength 410nm.

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