Coordination Compounds: Transition Metals & Nomenclature

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Questions and Answers

Why are transition metals and their compounds effective catalysts?

They exhibit diamagnetic properties.
They possess a fixed oxidation state.
They readily form ionic bonds with reactants.
They can exist in multiple oxidation states. (correct)

Why is zinc not considered a transition metal?

It has a low melting point compared to other transition metals.
It has a completely filled d-orbital in its ground state. (correct)
It does not form colored compounds.
It readily loses electrons.

How many geometrical isomers are possible for the complex ion $[CoCl_2(en)_2]^+$?

Three
Two (correct)
Four
One

Which of the following is the correct IUPAC name for $[Cr(NH_3)_5CO_3]Cl$?

Pentaamminecarbonatochromium(III) chloride (B) Signup and view all the answers

Which of the following best describes a bidentate ligand?

A ligand that binds to a metal through two donor atoms. (C) Signup and view all the answers

What is the primary difference between lanthanoid and actinoid contraction?

Actinoid contraction is generally greater than lanthanoid contraction due to poorer shielding of nuclear charge by 5f electrons. (D) Signup and view all the answers

Which of the following complexes is an anionic complex?

$[Fe(CN)_6]^{4-}$ (A) Signup and view all the answers

Select the correct IUPAC name for the coordination compound $[Co(en)_3]^{3+}$

Tris(ethane-1,2-diamine)cobalt(III) ion (A) Signup and view all the answers

What characteristic defines a polydentate ligand?

It binds to a central metal ion through multiple donor atoms. (C) Signup and view all the answers

Identify the coordination compound from the options below.

Potassium Hexacyanoferrate(II) ($K_4[Fe(CN)_6]$) (C) Signup and view all the answers

Flashcards

Why are transition metals good catalysts?

Transition metals can exist in multiple oxidation states, allowing them to gain or lose electrons readily during a reaction.

Why isn't Zinc a transition metal?

Zinc has a fully filled d-orbital in its ground state and excited states.

Monodentate Ligand

A ligand that coordinates through one donor atom.

Bidentate Ligand

A ligand that coordinates through two donor atoms.

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Polydentate Ligand

A ligand that coordinates through multiple donor atoms.

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Anionic Complex

A complex ion with a net negative charge

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Lanthanoid/Actinoid Contraction

The decrease in size of the atoms and ions of the lanthanide and actinide series as the atomic number increases

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Study Notes

Study notes about Coordination Compounds.

Transition Metals and Catalysis

Transition metals and their compounds are effective catalysts due to their ability to exist in multiple oxidation states
They can gain or lose electrons during a reaction

Zinc as a Transition Metal

Zinc is not considered a transition metal
It has fully filled d-orbitals in its unexcited (ground) state and all excited states

IUPAC Nomenclature of Coordination Complexes

[Cu(NH3)4Cl2]+ is named Tetraaminedichloridochromate (III)
[Co(en)3]3+ is named Tris(ethane-1,2-diamine)cobalt (III) ion
[Co ONO(NH3)5]Cl2 is named Pentaaminenitrito-o-cobalt (III) Chloride
[Cr(NH3)5CO3]Cl is named Pentaamminecarbonatochromium (III) Chloride

Isomers of [CoCl2(en)2]+

[CoCl2(en)2]+ has two geometrical isomers (cis- and trans-)
It has one optical isomer (cis-)

Ligands

Monodentate ligands definition required, see text book/Notes
Bidentate ligands definition required, see text book/Notes
Polydentate ligands definition required, see text book/Notes