Coordination Compounds

Question 1

In a coordination complex the transition metals serves as lewis ____ while the ligand as lewis ____

Answer 1

acid (accept electron)
base (donates electron)

Question 2

The ___ or the primary valence of the metal, expresses the ability of the metal to form ionic compounds with oppositely charged ions

Answer 2

oxidation state

Question 3

The ___ or secondary valence expresses the ability of the metal to bind to ligands

Answer 3

Coordination number

Question 4

Refers to the number of times a ligand bonds to a metal through donor atoms

Answer 4

Denticity

Question 5

Substances that have ability to hold metal atoms like a claw

Answer 5

Chelating agents

Question 6

High CN is associated with large radii of atom or ion
Low CN is associated with bulky and charged ligands

Answer 6

Recall the three factors that govern the CN of a complex

Question 7

Isomers the differ in terms of connectivity of atoms

Answer 7

Structural isomers

Question 8

Recall 5 types of structural isomers

Answer 8

Linkage
Ionization
Hydration
Coordination
Polymerization

Question 9

Ambidentate ligands give rise to ___ isomerism in which the same ligand may link through different atoms

Answer 9

Linkage

Question 10

Isomerism that occurs when a ligand and a counterion in one compound exchange places

Answer 10

Ionization

Question 11

Very similar to ionization but one of the ligands in the complex is water

Answer 11

Hydration

Question 12

Isomerism that forms when there are different complex ions that can form from the same molecular formula

Answer 12

Coordination

Question 13

Isomers that denite complexes which have the same empirical formula but different molar masses

Answer 13

Polymerization

Question 14

Isomers that differ only in their 3D arrangements

Answer 14

Stereoisomers. May be geometric or optical

Question 15

First anti cancer drug based on in inorganic complexes

Answer 15

Cisplatin

Question 16

Isomers that are non-superimposable mirror images of each other and can rotate plane-polarized light

Answer 16

Optical isomers

Question 17

Recall two types of stereoisomers

Answer 17

Recall formula writing and naming

Question 18

For square planar and octahedral complexes, there are ____ geometric isomers

Answer 18

Cis-trans

Question 19

Octahedral complexes also have additional geometric isomers except for cis trans including ___

Answer 19

Facial-meridional

Question 20

An electrostatic model that involves the interactions between ligands and metal d-orbitals, though not taking into account it’s overlap

Answer 20

Crystal Field Theory.

Question 21

Application of MOT that concentrates on metal d-orbitals providing information on splitting parameter

Answer 21

Ligand field theory

Question 22

When ligands attach to transition metal, the d-orbitals are split into high and low energy orbitals.

Answer 22

Recall the two eg orbitals, and three t2g orbitals

Question 23

Refers to the separation between tg and eg orbitals

Answer 23

Ligand field splitting parameters

Question 24

The magnitude of ligand field splitting parameter depends on charge on the metal ion, principal quantum number of metal, and nature of ligands

Answer 24

Eg orbitals go up in energy by 3/5∆o
T2g orbitals go down in energy by 2/5∆o

Question 25

Recall the factors that affect the magnitude of ligand field splitting parameters

Answer 25

Recall the spectrochemical series of M+

Question 26

Increasing the charge on a metal ion
1. Increases the attraction of anionic ligands to the metal
2. Decreases the radius of metal

Answer 26

Conclusion: the magnitude of slitting parameter increases ss the charge on the metal ion increases.

Question 27

An increase in principal quantum number of the metal means an increase in the radius of the metal, resulting in shorter metal-ligand distances and stronger d-orbital ligand interaction

Answer 27

Conclusion: for complexes with metals and ligand from the same group, the magnitude increases with increasing principal quantum number

Question 28

For series of chemically similar ligands, the magnitude of splitting increases as size of donor atom decreases.

Answer 28

Spectrochemical series have weak and strong field ligands (higher splitting energy)

Question 29

For transition metal ions with ___ to ___ configurations exhibit high spin and low spin states.

Answer 29

d4 to d7

Question 30

Phenomenon that occurs when degenerate orbitals are not equally filled with electron

Answer 30

Jahn-Teller effect

Question 31

Recall octahedral configurations that doesn’t experience Jahn Teller distortion

Answer 31

d3
high spin d5
low spin d6
d8
d10

Question 32

Refers to the reduced interelectronic repulsions in the valence orbital of a metal when it’s bonded with ligand in a complex

Answer 32

Nephelauxetic effect

Question 33

Dimensionless quantity that indicates the degree of attraction of a material in response to an applied magnetic field

Answer 33

Magnetic susceptibility

Question 34

Positive magnetic susceptibility suggests

Answer 34

Paramagnetic (unpaired)

Question 35

Negative magnetic susceptibility suggests

Answer 35

Diamagnetic (paired)

Question 36

Coordination compounds with strongfield ligands are yellow, orange, or red because they absorb ___

Answer 36

Higher energy violet or blue light

Question 37

Coordination compounds with weak field ligands are blue-green, blue, or indigo because they absorb ___

Answer 37

lower energy yellow, krange or red light

Question 38

Selection rule that states that only transition between states of different parity are allowed.

Answer 38

Laporte selection rule.
Parity is symmetry with respect to a center of inversion (gerade or ungerade)

Question 39

Selection rule that states that only transitions between states of the same multiplicity are allowed

Answer 39

Spin selection rules

Question 40

The d-d transitions are allowed by relaxing the first selection rule through vibronic coupling, temporarily destroying symmetries

Answer 40

Spin orbit coupling may relax the second rule to allow some transitions

Question 41

Recall naming of complex coordinate compounds

Question 42

Coordination of a ligand to a metal center via an uninterrupted and contiguous series of atom

Answer 42

Hepaticity