Textbook Question
Complete the exercises below. Draw the crystal-field energy-level diagrams and show the placement of electrons for each of the following complexes:
a. [VCl6]3–,
b. [FeF6]3– (a high-spin complex),
Ch.23 - Transition Metals and Coordination Chemistry
Chapter 23, Problem 91a,d
The coordination complex [Cr(CO)6] forms colorless, diamagnetic crystals that melt at 90 °C
a. What is the oxidation number of chromium in this compound?
d. Write the name for [Cr(CO)6] using the nomenclature rules for coordination compounds.
Verified step by step guidance1
Identify the ligands in the coordination complex. In [Cr(CO)6], the ligand is carbon monoxide (CO), which is a neutral ligand.
Determine the charge of the ligands. Since CO is a neutral ligand, it contributes a charge of 0 to the complex.
Calculate the overall charge of the complex. [Cr(CO)6] is a neutral complex, meaning the sum of the oxidation state of chromium and the charges of the ligands is zero.
Set up the equation for the oxidation state of chromium. Let x be the oxidation state of chromium. Since the complex is neutral and CO is neutral, the equation is x + 6(0) = 0.
Solve for x to find the oxidation state of chromium. Since the equation simplifies to x = 0, the oxidation state of chromium in [Cr(CO)6] is 0. The name of the compound is hexacarbonylchromium(0).
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Related Practice
Open Question
Draw the structure for Pt (en) Cl₂ and use it to answer the following questions: a. What is the coordination number for platinum in this complex? b. What is the coordination geometry? c. What is the oxidation state of the platinum? d. How many unpaired electrons are there? [Find more in Sections 23.2 and 23.6.]
Textbook Question
Four-coordinate metals can have either a tetrahedral or a square-planar geometry; both possibilities are shown here for [PtCl2(NH3)2].
a. What is the name of this molecule?
b. Would the tetrahedral molecule have a geometric isomer?
c. Would the tetrahedral molecule be diamagnetic or paramagnetic?
d. Would the square-planar molecule have a geometric isomer?
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Open Question
Complete the exercises below. a. A compound with formula RuCl₃ • 5H₂O is dissolved in water, forming a solution that is approximately the same color as the solid. Immediately after forming the solution, the addition of excess AgNO₃ (aq) forms 2 mol of solid AgCl per mole of complex. Write the formula for the compound, showing which ligands are likely to be present in the coordination sphere.