cry 23.26 Indicate the coordination number and the oxidation num. ber of the metal for each of the following complexes: (a) K3[Co(CN)6] (b) Na[CdBr4] (c) [Pt(en)3](Cl04)4 (d) [Co(en)2(C204)]* (e) NH4[Cr(NH3)2(NCS)4] (f) [Cu(bipy)2I]I Common Ligands in Coordination Chemistry Section 23.3) 23.27 For each of the following molecules or polyatomic ions, draw the Lewis structure and indicate if it can act as a monodentate ligand, a bidentate ligand, or is unlikely to act as a ligand at all: (a) ethylamine, CH,CH,NH, (b) trimethylphosphine, P(CH,)3, (c) carbonate, CO,2- ale (d) ethane, C,H, 23.28 For each of the following polydentate ligands, determine (1) ph the maximum number of coordination sites that the ligand can occupy on a single metal ion and (ii) the number and type of donor atoms in the ligand: (a) ethylenediamine (en), (b) bipyridine (bipy), (c) the oxalate anion (C2O4), (d) the 2- ion of the porphine molecule (Figure 23.13), (e) [EDTA]4. 3.29 Polydentate ligands can vary in the number of coordi- nation positions they occupy. In each of the following, identify the polydentate ligand present and indicate the probable number of coordination positions it orcunies: Z8.3

cry 23.26 Indicate the coordination number and the oxidation num. ber of the metal for each of the following complexes: (a) K3[Co(CN)6] (b) Na[CdBr4] (c) [Pt(en)3](Cl04)4 (d) [Co(en)2(C204)]* (e) NH4[Cr(NH3)2(NCS)4] (f) [Cu(bipy)2I]I Common Ligands in Coordination Chemistry Section 23.3) 23.27 For each of the following molecules or polyatomic ions, draw the Lewis structure and indicate if it can act as a monodentate ligand, a bidentate ligand, or is unlikely to act as a ligand at all: (a) ethylamine, CH,CH,NH, (b) trimethylphosphine, P(CH,)3, (c) carbonate, CO,2- ale (d) ethane, C,H, 23.28 For each of the following polydentate ligands, determine (1) ph the maximum number of coordination sites that the ligand can occupy on a single metal ion and (ii) the number and type of donor atoms in the ligand: (a) ethylenediamine (en), (b) bipyridine (bipy), (c) the oxalate anion (C2O4), (d) the 2- ion of the porphine molecule (Figure 23.13), (e) [EDTA]4. 3.29 Polydentate ligands can vary in the number of coordi- nation positions they occupy. In each of the following, identify the polydentate ligand present and indicate the probable number of coordination positions it orcunies: Z8.3

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter21: Transition Metals And Coordination Chemistry

Section: Chapter Questions

Problem 108IP: a. In the absorption spectrum of the complex ion Cr(NCS)63, there is a band corresponding to the...

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Four different octahedral chromium coordination compounds exist that all have the same oxidation state for chromium and have H2O and Cl as the ligands and counterions. When 1 mole of each of the four compounds is dissolved in water, how many moles of silver chloride will precipitate upon addition of excess AgNO3?
Two different compounds are known with the formula Pd(py)2Cl2, but there is only one compound with the formula Zn(py)2Cl2. The symbol py is for pyridine, a mono-dentate ligand. Explain the differences in the Pd and Zncompounds.
a. In the absorption spectrum of the complex ion Cr(NCS)63, there is a band corresponding to the absorption of a photon of light with an energy of 1.75 104 cm-1. Given 1 cm1 = 1.986 1023 J, what is the wavelength of this photon? b. The CrNC bond angle in Cr(NCS)63 is predicted to be 180. What is the hybridization of the N atom in the Ncs- ligand when a Lewis acid-base reaction occurs between Cr3+ and NCs- that would give a 180 CrNC bond angle? Cr(NCS)63 undergoes substitution by ethylenediamine (en) according to the equation Cr(NCS)63+2enCr(NCS)2(en)2++4NCS Does Cr(NCS)2(en)2+ exhibit geometric isomerism? Does Cr(NCS)2(en)2+ exhibit optical isomerism?
Trimethylphosphine, P(CH3)3, can act as a ligand by donating the lone pair of electrons on the phosphorus atom. If trimethylphosphine is added to a solution of nickel(Il) chloride in acetone, a blue compound that has a molecular mass of approximately 270 g and contains 21.5% Ni, 26.0% Cl, and 52.5% P(CH3)3 can be isolated. This blue compound does not have any isomeric forms. What are the geometry and molecular formula of the blue compound?
The square-planar complex Pt(en)Cl2 has chloride ligands in a cis configuration. No trans isomer is known. Based on the bond lengths and bond angles of carbon and nitrogen in the ethylenediamine ligand, explain why the trans compound is not possible.