ligand that coordinates to one central metal through coordinate bonds from two different atoms

ion or atom to which one or more ligands is attached through coordinate covalent bonds

complex formed from a polydentate ligand attached to a central metal

ligand that attaches to a central metal ion by bonds from two or more donor atoms

configuration of a geometrical isomer in which two similar groups are on the same side of an imaginary reference line on the molecule

coordination compound

substance consisting of atoms, molecules, or ions attached to a central atom through Lewis acid-base interactions

number of coordinate covalent bonds to the central metal atom in a complex or the number of closest contacts to an atom in a crystalline form

central metal atom or ion plus the attached ligands of a complex

atom in a ligand with a lone pair of electrons that forms a coordinate covalent bond to a central metal

(or coordination isomer) isomer in which an anionic ligand is replaced by the counter ion in the inner coordination sphere

ion or neutral molecule attached to the central metal ion in a coordination compound

coordination compound that possesses a ligand that can bind to the transition metal in two different ways (CN^− vs. NC^−)

ligand that attaches to a central metal through just one coordinate covalent bond

(also, enantiomer) molecule that is a nonsuperimposable mirror image with identical chemical and physical properties, except when it reacts with other optical isomers

ligand that is attached to a central metal ion by bonds from two or more donor atoms, named with prefixes specifying how many donors are present (e.g., hexadentate = six coordinate bonds formed)

configuration of a geometrical isomer in which two similar groups are on opposite sides of an imaginary reference line on the molecule

19.2 Coordination Chemistry of Transition Metals: practice

Coordination Chemistry of Transition Metals: practice problems

4 problems from the book, with its answers. Check your working, or have any of them explained to you on the whiteboard.

Exercises 27

Give the coordination numbers and write the formulas for each of the following, including all isomers where appropriate:

(a) tetrahydroxozincate(II) ion (tetrahedral)

(b) hexacyanopalladate(IV) ion

(d) diamminedichloroplatinum(II)

(e) potassium diamminetetrachlorochromate(III)

(f) hexaamminecobalt(III) hexacyanochromate(III)

(g) dibromobis(ethylenediamine) cobalt(III) nitrate

Exercises 29

Sketch the structures of the following complexes. Indicate any cis, trans, and optical isomers.

(a) [Pt(H₂O)₂Br₂] (square planar)

Exercises 33

Exercises 35

Key terms · 16

bidentate ligand: ligand that coordinates to one central metal through coordinate bonds from two different atoms
central metal: ion or atom to which one or more ligands is attached through coordinate covalent bonds
chelate: complex formed from a polydentate ligand attached to a central metal
chelating ligand: ligand that attaches to a central metal ion by bonds from two or more donor atoms
cis configuration: configuration of a geometrical isomer in which two similar groups are on the same side of an imaginary reference line on the molecule
coordination compound: substance consisting of atoms, molecules, or ions attached to a central atom through Lewis acid-base interactions
coordination number: number of coordinate covalent bonds to the central metal atom in a complex or the number of closest contacts to an atom in a crystalline form
coordination sphere: central metal atom or ion plus the attached ligands of a complex
donor atom: atom in a ligand with a lone pair of electrons that forms a coordinate covalent bond to a central metal
ionization isomer: (or coordination isomer) isomer in which an anionic ligand is replaced by the counter ion in the inner coordination sphere
ligand: ion or neutral molecule attached to the central metal ion in a coordination compound
linkage isomer: coordination compound that possesses a ligand that can bind to the transition metal in two different ways (CN^− vs. NC^−)
monodentate: ligand that attaches to a central metal through just one coordinate covalent bond
optical isomer: (also, enantiomer) molecule that is a nonsuperimposable mirror image with identical chemical and physical properties, except when it reacts with other optical isomers
polydentate ligand: ligand that is attached to a central metal ion by bonds from two or more donor atoms, named with prefixes specifying how many donors are present (e.g., hexadentate = six coordinate bonds formed)
trans configuration: configuration of a geometrical isomer in which two similar groups are on opposite sides of an imaginary reference line on the molecule

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