Explanation a. In coordination chemistry, the atoms, which contain a lone pair of electrons, can act as the donor atoms. In both cyanide and en, the nitrogen atom contains lone pair of electrons. Hence, they act as donor atoms in the respective ligands. And, in both water and dmg, oxygen contains a lone pair of electrons and thus acts as a donor. b. A ligand is termed as monodentate ligand if it has a single coordinating bond with the metal in a complex. Examples of monodentate ligands are ammonia, water, chloride, cyanide, etc. In the above figure, the monodentate ligands are cyanide [A] and water [C]. c. A ligand is termed as bidentate ligand if it has two coordinating bonds with the metal in a complex. Examples of bidentate ligands are ethylenediammine, bipyridine, dimethylglyoxime, etc. In the above figure, the bidentate ligands are ethylenediammine [G] and dimethylglyoxime [I]. d. Cyanide is a monodentate ligand; therefore, the coordination number of nickel in N i ( C N ) 4 - 2 is four, and it forms a square planar structure. Dmg on the other hand is a bidentate ligand. Thus, in the complex N i ( d m g ) 2 , the coordination number of nickel is four, and it has a tetrahedral structure. e. Although the field strength of cyanide is more than that of dmg, the value of ∆ o in four-coordinate system does not affect much on the splitting of the degenerate orbitals as seen in the six-coordinate systems. Thus, the field strength will not have much effect on the energy required for transitions. The absorption spectra shown in [F] is that of N i ( C N ) 4 - 2 complex. The absorbed wavelength is in the range of 600 n m - 700 n m , that is, orange-red; therefore, the emission wavelength will be in the range of 470 n m - 500 n m , that is, blue-green

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ISBN: 9780393644777

Author: Gilbert

Publisher: MCGRAW-HILL HIGHER EDUCATION

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Question

Chapter 23, Problem 23.12VP

Interpretation Introduction

To find:

a. Identify the donor atoms.

b. Identify monodentate ligands.

c. Identify bidentate ligands.

d. Find the coordination number of Nickel.

e. Compare the field strengths of cyanide and dmg ligands, and identify the complex from color.

f. Identify the orbital diagram that Ni(CN)4-2 and Ni(dmg)2.

Expert Solution & Answer

Chapter 23 Solutions

SMARTWORKS FOR CHEMISTRY: ATOMS FOCUSED

Ch. 23 - Prob. 23.1VP Ch. 23 - Prob. 23.2VP Ch. 23 - Prob. 23.3VP Ch. 23 - Prob. 23.4VP Ch. 23 - Prob. 23.5VP Ch. 23 - Prob. 23.6VP Ch. 23 - Prob. 23.7VP Ch. 23 - Prob. 23.8VP Ch. 23 - Prob. 23.9VP Ch. 23 - Prob. 23.10VP

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