Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CHEM 250 - UBC > Coordination Chemistry > Flashcards

Coordination Chemistry Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

A complex is a ____ ion surrounded by ____

A

metal

ligands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

____ are atoms or molecules that have lone pairs of electrons or electron density that can interact with metal centres

A

Ligands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

A complex ligand is a ____. A simple ligand is a ____.

A

molecule

atom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Ligands act as lewis ____.

A

Bases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Ligands have lone pairs which they can donate to a ____

A

metal center

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

the central atom in a complex is a ____ _____

A

metal ion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Metals centers act as lewis ___.

A

acids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Lewis bases ____ lone pairs

A

donate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Lewis acids ____ lone pairs

A

accept

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Name two things that characterize complexes

A
  1. Variable oxidation states due to variable occupation of the d-shell of the metal
  2. Higher covalent character in the bonds between the ligand and transition metal compared to pretransition metals
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Do metals centers and ligands form simple ionic lattices?

A

no

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What are the bonds between a metal center and ligands called? (2 possible answers)

A

Coordinate covalent bonds

dative bonds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the general formula for a complex?

A

[MLn]^m+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Define coordination number

A

the number of ligands bound to M^x+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Ligands can be …? (anionic, neutral, cationic)

A

anionic or neutral

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Are ligands monoatomic or polyatomic?

A

Trick question, the answer is both!

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The name of ____ ligands ends in an “o”

A

anionic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Define denticity

A

the number of atoms on the ligand that are used to bind to a metal

19
Q

What are the two ways a ligand can be polydentate (denticity >1)?

A

Chelation

bridging

20
Q

Define chelating

A

when 2 or more atoms on the same ligand bind to the

same metal ion

21
Q

Define bridging

A

when the same ligand binds to more than one metal ion

22
Q

What is the shape formed for a coordination number of 6?

A

octahedral

23
Q

What is the shape formed for a coordination number of 4?

A

square planar or tetrahedral

24
Q

What is the shape formed for a coordination number of 5?

A

trigonal bipyramidal

square pyramidal

25
Q

What is the shape formed for a coordination number of 2?

A

linear

26
Q

What is the shape formed for a coordination number of 3?

A

trigonal planar

27
Q

What are the two geometric isomers for square planar?

A

cis and trans

28
Q

For anionic complexes the metal name should end with “___”

A

-ate

29
Q

What is the difference between an coordinate covalent bond and a covalent bond?

A

In the coordinate covalent bond only the ligand is donating e- for sharing where as in a covalent bond both parties would put forth e- for sharing

30
Q

What is a coordinated complex?

A

A complex that is associated with an ion

31
Q

What symbol is used to denote bridging ligands?

A

µ (greek letter mu)

32
Q

What is meant when it is said that a molecule is paramagnetic?

A

The molecule is attracted to an external magnetic field (paramagnetism is a result of unpaired e-)

33
Q

What is meant when it is said that a molecule is diamagnetic?

A

The molecule is not attracted to (in fact it is slightly repeled) by an external magnetic field
(diamagnetism is a result of all e- being spin paired)

34
Q

How many d orbitals have e- density between the axes and how many d orbitals have e- on the axes?

A

3 in between the axes

2 on the axes

35
Q

The CF splitting energy _____(decreases/increases) as you go down periodic table

A

increases

36
Q

In general, the higher the oxidation state the _____ (lesser/greater) the CF splitting energy

A

greater

37
Q

An increase in the number of ligands and e- results in a greater e- repulsion between ligands and and metals so the CF splitting energy is ____(lower/higher)

A

higher

38
Q

Which generally has a higher CF splitting an octehedral complex or a tetrahedral complex?

A

Octehedral

39
Q

When does high spin occur?

A

At the point where there is the maximum number of unpaired e-

40
Q

When does lowspin occur?

A

When e- are all paired in lower energy orbitals before the higher energy orbitals

41
Q

In the crystal field theory ligands are treated as ____ ____

A

point charges

42
Q

In the crystal field theory there is no overlap between ___ ___ and ____ ____

A

ligand orbitals and metal orbitals

43
Q

Is low or high spin more favourable?

A

low spin is more favourable

CHEM 250 - UBC (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions