ligands and complex ions

Question 1

define ligand

Answer 1

ion or molecule that forms a coordinate bond with a transition metal

Question 2

define coordinate bond

Answer 2

a covalent bond in which both electrons from the shared pair come from same atom

Question 3

define coordinate number

Answer 3

a number of coordinate bonds to ligands around a transition metal ion

Question 4

define complex ion

Answer 4

a metal ion surrounded by co-ordinately bonded ligands

Question 5

define bidendate

Answer 5

a ligand that can form 2 coordinate bonds

Question 6

give some examples of unidendate ligands

Answer 6

H2O, Cl-, NH3, OH- , CN-

Question 7

give some examples of bidendate ligands

Answer 7

NH2CH2CH2NH2

Question 8

give an example of an octahedral complex

Answer 8

[Cu(H2O)6] 2+
[Fe(H2O)6]3+

Question 9

what shape will form with a 6 fold coordination number

Answer 9

octahedral 90 degrees

Question 10

what shape could form with a 4 fold coordination number

Answer 10

tetrahedral 109.5 or square planar 90

Question 11

give an example of a tetrahedral complex

Answer 11

CuCl 42–
CoCl 4 2–

Question 12

give an example of a square planar complex

Answer 12

Pt(NH3)2Cl 2 - platin

( and nickel complexes?)

Question 13

define stereoisomer

Answer 13

compounds with the same structural formula but with a different arrangement in space

Question 14

draw the two stereoisomers of platin

Answer 14

Question 15

draw an optical isomer

Answer 15

Question 16

define optical isomer

Answer 16

non-superimposable mirror image

Question 17

what is cis-platin used for?

Answer 17

• an effective drug used in cancer treatments
• binds to DNA in cancer cells and changes it or damages cancer cells