Open Question
Draw a crystal field energy-level diagram, and predict the number of unpaired electrons for each of the following: (c) [FeO4]2-; (b) [Ru(NH3)6]2+ (low spin).
Ch.21 - Transition Elements and Coordination Chemistry
Chapter 21, Problem 123d
For each of the following, (i) give the systematic name of the compound and specify the oxidation state of the transition metal, (ii) draw a crystal field energy-level diagram and assign the d electrons to orbitals, (iii) indicate whether the complex is high-spin or low-spin (for d4 - d7 complexes), and (iv) specify the number of unpaired electrons. (d) K4[Os(CN)6]
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Identify the components of the complex K4[Os(CN)6]: Potassium (K), Osmium (Os), and the cyanide ligand (CN). The complex ion is [Os(CN)6]4-.
Determine the oxidation state of Osmium (Os): The charge of the complex ion is 4-. Each CN ligand has a charge of -1. Therefore, the oxidation state of Os is calculated by setting up the equation: x + 6(-1) = -4, where x is the oxidation state of Os.
Draw the crystal field energy-level diagram for the octahedral complex [Os(CN)6]4-. Place the d orbitals in the octahedral field, splitting them into t2g and eg levels. Assign the d electrons based on the oxidation state of Os and the total number of d electrons.
Determine if the complex is high-spin or low-spin: Cyanide (CN) is a strong field ligand, which typically leads to a low-spin configuration. Consider the electron pairing in the t2g orbitals before filling the eg orbitals.
Count the number of unpaired electrons: Based on the electron configuration from the crystal field diagram, identify how many electrons remain unpaired in the d orbitals.
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Textbook Question
For each of the following, (i) give the systematic name of the compound and specify the oxidation state of the transition metal, (ii) draw a crystal field energy-level diagram and assign the d electrons to orbitals, (iii) indicate whether the complex is high-spin or low-spin (for d4 - d7 complexes), and (iv) specify the number of unpaired electrons.
(a) (NH4)[Cr(H2O)6](SO4)2
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Textbook Question
For each of the following, (i) give the systematic name of the compound and specify the oxidation state of the transition metal, (ii) draw a crystal field energy-level diagram and assign the d electrons to orbitals, (iii) indicate whether the complex is high-spin or low-spin (for d4 - d7 complexes), and (iv) specify the number of unpaired electrons.
(c) [Ni(NH3)4(H2O)2](NO3)2
116
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Textbook Question
For each of the following, (i) give the systematic name of the compound and specify the oxidation state of the transition metal, (ii) draw a crystal field energy-level diagram and assign the d electrons to orbitals, (iii) indicate whether the complex is high-spin or low-spin (for d4 - d7 complexes), and (iv) specify the number of unpaired electrons.
(e) [Pt(NH3)4](ClO4)2
96
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Textbook Question
For each of the following, (i) give the systematic name of the compound and specify the oxidation state of the transition metal, (ii) draw a crystal field energy-level diagram and assign the d electrons to orbitals, (iii) indicate whether the complex is high-spin or low-spin (for d4 - d7 complexes), and (iv) specify the number of unpaired electrons.
(f) Na2[Fe(CO)4]
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Open Question
The drug Nipride, Na2[Fe(CN)5NO], is an inorganic complex used as a source of NO to lower blood pressure during surgery. (a) The nitrosyl ligand in this complex is believed to be NO+ rather than neutral NO. What is the oxidation state of iron, and what is the systematic name for Na2[Fe(CN)5NO]? (b) Draw a crystal field energy-level diagram for [Fe(CN)5NO]2-, assign the electrons to orbitals, and predict the number of unpaired electrons.