week 9

Question 1

Ligands have

Answer 1

one or more donor atoms – these are atoms that have a lone pair of electrons that are able to be donated towards a metal ion.

Question 2

ligand charge

Answer 2

neutral eg water amonia
or anionic eg chorlie cyanide CN-

Question 3

Ligands can be classified by

Answer 3

the number of donor atoms that attach to a metal centre.

ligands with one donor atom are called monodentate; ligands with two donor atoms are call bidentate; three = tridentate, etc.

Question 4

monodenatte ligands rule

Answer 4

can have more then one atom wich can cordinate with the metal but will on ly have one at a time

Question 5

What does bidentate mean?
3x things

Answer 5

describes ligands with two donor atoms that can be simultaneously attached to the same metal ion

can be symmetrical or asymmetrical (i.e. have different types of donor atoms).

Just because a ligand can act as a chelating ligand, does not mean that it always will

Question 6

Tridentate ligands have

Answer 6

three donor atoms.

Question 7

What is a chelate ring?

Answer 7

the ring formed when a polydentate ligand coordinates to a transition metal ion

Question 8

Ligands with many donor atoms are sometimes called

Answer 8

‘polydentate’.

Question 9

the Latin name for copper

Answer 9

cuprate

Question 10

latin name for iron

Answer 10

ferrate

Question 11

A special class of polydentate ligands are

Answer 11

‘macrocyclic ligands’. As the name implies, these ligands are large ring-shaped molecules that have multiple donor atoms.

Question 12

Some ligands are capable of coordinating simultaneously to multiple metals. called?

Answer 12

These ligands act as a bridge between the metals and are therefore called ‘bridging ligands’. Bridging ligands can have one donor atom with multiple lone pairs

Question 13

What is a Lewis base?

Answer 13

an electron pair donor

Question 15

What does monodentate mean?

Answer 15

describes a ligand that can coordinate to a metal ion using only one donor atom

Question 16

What is nuclearity?

Answer 16

The nuclearity of a single coordination entity indicates the number of central atoms joined by bridging ligands or metal-metal bonds

Question 17

the Latin name for lead

Answer 17

Plumbate

Question 18

the Latin name for tin

Answer 18

Stannate

Question 19

What are chelate complexes?

Answer 19

a complex ion containing one or more chelate rings

Question 20

What is a coordinate bond?

Answer 20

a covalent bond between a Lewis acidic metal ion and a Lewis basic ligand in which both electrons originate from the ligand

Question 21

What is a donor atom?

Answer 21

an atom of a ligand in a complex that is directly coordinated to the transition metal ion

Question 22

What does polydentate mean?

Answer 22

describes a ligand containing two or more atoms that can coordinate simultaneously to a metal ion

Question 23

True or False: chelate rings are thermodynamically very stable

Answer 23

ture

Question 24

Are cations or anions written first when naming coordination compounds?

Answer 24

Cations

Question 25

How do you name a ligand that has two potential donor atoms?

Answer 25

The Greek letter kappa, K, is used i.e. Thiocyanato-kS (coordinated through sulfur)

Question 26

How do you name a negatively charged complex?

Answer 26

The suffix ‘-ate’ is added to the metal

Question 27

Aqua (H2O) Complexes when join

Answer 27

All first-row transition metals dissolve in water to form complexes with water or hydroxide (ligands).

Question 28

Cyanido Complexes features x2 bonding

Answer 28

The cyanide anion (N≡C-) usually binds through the carbon atom (this is the atom that carries the negative charge). It is possible for the cyanide anion to coordinate through both the C and N atoms and act as a bridging ligand.

Question 29

what happens when multidentate ligand coordinates with more then one donor atom

Answer 29

he ligand is said to be a chelating ligand and the resulting compound is said to be a chelate complex.

Question 30

chelate effect

Answer 30

The chelate complexes are more stable than non-chelate complexes.

Question 31

argentate

Answer 31

sliver

Question 32

aurate

Answer 32

gold

Question 33

nomenulture rule for the metal

Answer 33

comes last in the full name first in formula

Question 34

What dose ambidentate mean?

Answer 34

ligands with two more different potential donor atoms

Question 35

anionic ligands end in --

Answer 35

ido nutral unchanged apart from aqua

Question 36

oxdication number in metal

Answer 36

given as roman numeral in brackets after the metal

Question 37

if complex is an anion

Answer 37

endind chnaged to -ate

Question 38

ligands are odered by

Answer 38

alphbetically in name and formula

Question 39

number of counter ions named

Answer 39

no not names in full name, implied by oxidation number