Coordination Compounds of Transition Metals: Properties, Naming, and Crystal Field Theory , Study notes of Chemistry

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Coordination Compounds

Compounds containingTransition Metals

Coordination Compounds

Transition Metals

Sc

Cu

1st row

Y

Ag

2nd row

La

Au

3rd row

Trends

Down group:

Same outer electron configurationDecrease in reactivity

Across period

Increase in atomic no.Increase in atomic massIncrease in nuclear charge, I.E.Slight decrease in radii

Reaction with acid

Many react: Fe, Ni, Co

hydrogen

Some inert: Cr, Au, Pt

Ions

When metals lose elections to form (+)ions, electrons come from 4s before 3d Co:

4s

2

3d

7

Co

3+

3d

6

Oxidation states

Variable in compounds Mostly +2 or +3Reaches max at center of seriesHigh:

VF

5

Mn

2

O

7

CrO

3

Transition

Metals

Naming Compounds Compounds may be:

Cation

Neutral

Anion

[Co(NH

3

)

4

Cl

2

]Br

[Ni(CO)

4

]

K

3

[Fe(CN)

6

]

Learn steps for naming

Naming Compounds

Ligand Names:

(table 20.3)

Br

bromo

CN

cyano

H

2

O

aquo

NH

3

ammine

CO

carbonyl

C

2

O

4

2-

oxalato

Naming Compounds

Indicate number of ligands by prefix:di

tri

tetra

penta

hexa

prefix not included in alphabetical order

If ligand name has prefix use:

bis tris tetrakis

bis(ethylenediamine)

Naming Compounds

[Ag(NH

3

2

]Cl

[Ag(NH

3

2

]

Cl

[Ag

(NH

3

0

2

]

Cl

diamminesilver(I) chloride

Naming Compounds

K

4

[Fe(CN)

6

]

K

4

4+

[Fe(CN)

6

]

4-

K

4

4+

[Fe

2+

(CN)

6-

6

]

4-

potassium hexacyanoferrate(II)

Naming Compounds

[Co(NH

3

3

Cl

3

]

triamminetrichlorocobalt(III)

Writing Formulas

diamminedibromoplatinum(IV) chloride

[Pt

4+

(NH

3

2

Br

2

]

Cl

2+

2