Liga

nds

and

nom

encl

atur

e8.

5 R

epre

sent

ativ

e lig

ands

Che

late

Bite

ang

elS

ix-m

embe

red

rings

may

be

favo

ured

ster

ical

lyor

by

elec

tron

delo

caliz

atio

n th

roug

h th

eir p

i-orb

itals

Mon

oden

tate

, bid

enta

te, t

riden

tate

….

Am

bide

ntat

e;

Thio

cyan

ate

ion

(NC

S- )

–is

othi

ocya

nato

com

plex

(atta

ch v

ia N

at

om),

thio

cyan

ato

com

plex

es (a

ttach

via

S a

tom

).N

itrite

ion

(NO

2- ) –

nitro

, nitr

ito

Con

stitu

tion

and

geom

etry

8.4

Poly

met

allic

com

plex

es

Con

stitu

tion

and

geom

etry

8.4

Poly

met

allic

com

plex

es

Con

stitu

tion

and

geom

etry

8.4

Poly

met

allic

com

plex

es

Con

stitu

tion

and

geom

etry

8.4

Poly

met

allic

com

plex

es

Con

stitu

tion

and

geom

etry

8.6

Nom

encl

atur

e

See

oth

er s

lides

Isom

eris

m a

nd c

hira

lity

A m

olec

ular

form

ula

is n

ot s

uffic

ient

to id

entif

y a

coor

dina

tion

com

poun

d: li

nkag

e, io

niza

tion,

hyd

rate

, and

coo

rdin

atio

n is

omer

ism

are

all

poss

ible

for c

oord

inat

ion

com

poun

ds.

Link

age

isom

eris

m: [

Co(

NO

2)(N

H3)

5]2+,n

itrito

(red)

, nitr

o (y

ello

w)

Ioni

zatio

n is

omer

ism

: whe

n a

ligan

dan

d a

coun

terio

nin

one

co

mpo

und

exch

ange

pla

ces,

[Pt(N

H3)

4Br 2

]Cl 2

vs[P

t(NH

3)4C

l 2]B

r 2

Hyd

rate

isom

eris

m: s

imila

r to

ioni

zatio

n is

omer

ism

but

one

of

the

ligan

dis

wat

er,[

Cr(

H2O

) 6]C

l 3, [C

r(H2O

) 5C

l]Cl 2

Coo

rdin

atio

n is

omer

ism

: whe

n th

ere

are

diffe

rent

com

plex

ions

th

at c

an fo

rm fr

om th

e sa

me

mol

ecul

ar fo

rmul

a,

[Co(

NH

3)6][

Cr(

CN

) 6] v

s[C

r(N

H3)

6][C

o(C

N) 6

]

Isom

eris

m a

nd c

hira

lity

Onc

e w

e ha

ve e

stab

lishe

d lig

ands

that

bin

d to

met

al, w

e ca

n th

en c

onsi

der h

ow to

arr

ange

thes

e lig

ands

.

Thes

e di

ffere

nt a

rrang

emen

ts c

an re

sult

in g

eom

etric

al

isom

eris

m a

nd o

ptic

al is

omer

ism

.

8.7

Squ

are-

plan

ar c

ompl

exes

cis-

trans

isom

ers