The term tridentate ligand ant the reason for why dien can act as tridentate should be explained briefly. Concept Introduction: Coordination compounds: The compounds having coordination covalent bonds which form when metal ions react with polar molecules or anions. Ligands: The ions or molecules that forms coordination covalent bond with metal ions in a coordination compound. Ligands should have minimum one lone pair of electron, where it donates two electrons to the metal. Metal atom accepts the electron pair from a ligand forming a coordination bond. Monodentate ligand is ligands which donate only one pair of electrons to form bond with metal. It only makes one bond with metal. Polydentate ligand forms two or more coordination bond with metal ions to form a complex.

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Chapter 20, Problem 20.135CHP

(a)

Interpretation Introduction

Interpretation:

The term tridentate ligand ant the reason for why dien can act as tridentate should be explained briefly.

Concept Introduction:

Coordination compounds: The compounds having coordination covalent bonds which form when metal ions react with polar molecules or anions.

Ligands: The ions or molecules that forms coordination covalent bond with metal ions in a coordination compound. Ligands should have minimum one lone pair of electron, where it donates two electrons to the metal. Metal atom accepts the electron pair from a ligand forming a coordination bond.

Monodentate ligand is ligands which donate only one pair of electrons to form bond with metal. It only makes one bond with metal. Polydentate ligand forms two or more coordination bond with metal ions to form a complex.

(b)

Interpretation Introduction

Interpretation:

The possible isomers for complex [Co(en)(dien)Cl]2+ should be drawn and the one that exist as chiral and achiral should be identified.

Concept Introduction:

Isomerism: Two chemical compounds are said to be isomers if they have same number and kind of atoms but different only in their orientation that is structural arrangements.

There are different types of isomerism in which geometric is of one type where the rotation around the atom is restricted like in cis-trans configuration. This is also refereed as cis-trans isomerism.

Structural isomers: Have same molecular formula but different bonding arrangements of atoms. It is classified into coordination isomer (occurs by exchanging a coordinated ligand and the counter-ions) and linkage isomers (ligand attached through different atoms to the metal).

Stereoisomers: differ in their spatial arrangement of atoms.

Chirality: Objects having non-superimposable mirror image relationship that is it does not contain plane of symmetry are referred as chiral objects.

Achiral: Objects having a plane of symmetry are referred as achiral objects.

Symmetry operation (Plane of symmetry):

It is an operation that gives an object looking the same after it has been carried out.

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