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INFRA RED Spectros

The document discusses various aspects of molecular vibrations, including the types of bonds and their interactions, as well as the implications of these vibrations in different molecular structures. It covers concepts such as dipole moments, bond strength, and the effects of molecular symmetry on vibrational modes. Additionally, it touches on the significance of hydrogen bonding and the role of molecular vibrations in determining physical properties.

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awasthi.rishu10
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0% found this document useful (0 votes)
12 views15 pages

INFRA RED Spectros

The document discusses various aspects of molecular vibrations, including the types of bonds and their interactions, as well as the implications of these vibrations in different molecular structures. It covers concepts such as dipole moments, bond strength, and the effects of molecular symmetry on vibrational modes. Additionally, it touches on the significance of hydrogen bonding and the role of molecular vibrations in determining physical properties.

Uploaded by

awasthi.rishu10
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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-liv vitiMe,

Middle
215 U m

moteute en the alsoplin


ilanaf enengy lnle of a
tle

felas the Hocki dauo K

constaul he btrd
’ Fece
Qhee k ’

bonel ‘ with bbrd


a
Juus, te wibaalual
0-H> C-0
(8) (I) (Q8)
(1)

ilanlK) is -lhe meau


teree

G=c >c-c;k =o>c -o;e-H>e-c; loH >c- o; oH> OD


vibráton aon e dala steltng
k=500 N

ser N 2

50 x{oS
2x 22 13
(20
20 xlo
1)(:6 lo
(20 th6)lo

3Xlomsl

K 5x105 dyne e
K 5x 12
me
No No
No No
atom ) D-alon
mmo
Reclueed
maas
mt mo
12 xl6yJ
b023xo
28
NoxNo (12tl6) =|i38 xI~23

L t23
38 XD
QX314X3 Xio
=|xo'4
|138

J884
V 20 4594
|8. 84
Yhe iR Aaliatai do mol have ufictu egd.
Cause tle exeitalou e ei heulei, il eauaei alovve ef

oganie eompaa to ibalt with hcheu anp lidiole akat


the eoualeit lpnds tielh conneel
Reut
qarligeo aud as it oeauns, the eounpoa
pali'ela
a mole eule, tlee oeeu a elauq
dipole moneu o% te moleeule il ead to the
% eeill eleitic
moleeule. tneialr
EMR (IR Aooliali)
the îR Aaiatoy ae dle moleele and a
eu the ehart
nlei
But ange an cipole moeu; no
aeton bocuns, heee o atUeptm takes fplaet
Jlesefoe,. Lelheton kulo olecule kehold. ehange
- Ahedipea memen od tud
dunuig the couse. balon i.e. ol L )
y. tlee ibraton wul satissEhv,
yhe matial sogieuny. of viba olou°o the houta
vibaaluoa ueidul
st be eqial to
KadlitoA
ter eg stetclug a syunotieol bond(c)
Mocleieeu no clane. i.e,tués
Thus, no absotos of 2 k tate plale
Dleeule is ealled as ?R Enative

diatomes

are îR Actue
Taiatomiee and eCeu haig cuitne of ayo
theu boud ocees no olipele nuat.
asyunetie
2
6oune ae syumae
CIR inotne)
Aneulau fialone aka o, so,. Hs cte ae
atie as he's md ef vibatons Modues
clhage dm
Langbage
erg.c=0 saoug baud due to Sangeeledio
gatilydee betweeu
md m.
-tydhocaoomweak, baude dueto les difeeue
eletthomaty HSc.
=245D H l= 0
H
(Trans - 1,2 -bi cklooete)
fudameal ibaton
Total
(n -no-o ntoni snmeletale )
= 3
Tramtaival He non-linea
Ketatueia begloe eden =3
3(e moleeuleg )
Relateuat bogace of kedom
tuecdom 9 (-for dneaumik euley
mo loeule

TY. + Roti + vib.


Veb. = 3n - | Tr+-Rot.)
=n- (3+3)
Non-linea
- |31 -64 moletule
- 3n-(3 +2)
ib.degne tuedom
|31-5 tor mbleeue
titg
1
Alpvd in a moeles bale
lavel!
poyatom molewles ehibit tan
funcdauatat
wi latiri. Jhe no. damutal niato depend
uprn dhe afueute owleeule ill e
meeule- thee
e a ou- inear peyabome
linea míleele
|3n- 6 unolaetlal modu z fo
3n-5
Moleeules Tolol no: Vibia toiy
(moces OoVibatos
31 -5 =3X354
HCNnear) 3n -5 3 X3-5 >4
3X3 -6 =3
Ho(non-liueau) 3n-6 =
eHy ( )3n- 6
)31-6
(inea) 3 n-5 = 3x4-5 =t
Ha
Moleoula Vehaaln

- NH)ee
Moleeulaa vrbalom
(Mo des of vbaolion)
Vbalonu
|Sutcluig Vibnatiaik

|Asynlie
shaalehg
Rockinel Taisting
ibAalios, the alouu ae Lilee ball
big hen aue
aud he bonds comettui
hee ae 2-typu vibaatow dic shelelig
wleu the olistauee.beluietu
Sheteling v'hiatuow!-
() oeeases but the aloing
t neeares
aloud esebalos
ayds.
6ehau iet e sano boudl al
tu' types

tie stntd Aulitspmetue


Lowe
Foneg-_e0 mole eule
(norehange in dm)
Syuwete sth
ibains

Autiammetie st.1Ratne
tbratoy.-( Dettmaton)
(i) beuding betureen the tu alons Aeai
ue diLtae atous ehanges
constaut,bt the þrsituin 4 e
asis
)kit. the iginal bo
srAEGuaeu Loute uey thaw slaetehing

(a Seiszoung
In- plane beudiig
( Tioisting
Isteueulalion
Bean
betectn
Souree.ot
Radiatin ateneualiy
TRAadialions ae thocleeed by
Neunst Alauneut aeoaste)
- Nacl
650 2000

aue e
Gaseons liguid aaules Chat paieainn)
an alkaliwilal
allali milal
bealdelemined as
- Seid samplesK&r) þellel. KBY dees nol- abceb 2Radlday
ne
are
halioe (eg <peetnum
4o6D 65D
beosle/eliat pape
wsed.
hun tilw ot subs
s taue
- o qwd sauole a calibenity eguipue?.A
bond al 1601 eul shou the acewas o tague
gines Regon Aotie
GION,LqoD
Cw
4oo - RE FRE L00 ()
otratli) QVENy
o0cnI cu-8 2980 -CH
Cui-3450
Cut 3600 DH -
c=o
a
te
has A
REGtON! FunCTIONAL
RoUP 0)
mmole a
cleut mino le eee will
ith elangA
ee toattiu Yle -
peue
ae. fnintr ge'
el,'juat
as fautieula
alseptuojn -ole the as
owe n)to ciatw ecpl" (tx
auodat ofbalouo the
ual
middlu (i)
band
absptn
at tha
20

lo0tegueyagren
fingeuPit

A log
A =
Lo Trasntauee
A
Lt
(oo'mea = Mo abconplksi

Peali te hunetiena Grep


Alhenyl=t-H Sdr. 3100-3 ol0 un due to
Aken c=c sto.
C-H shr.
l680 -l620 cui!
genestalion
Aromatc c c bud =l7o0- 500 cur
Aleohot/phouoe o-H = 3550-3200cut
3650-3580-> hee o
3350 - 3200 >tateoeeulau H-bonelng
3015 > Dathamolaeula H-bore
Canboryle aid o-Hstr. 3000 -2500 cun!
= 350b -33 00 cu
Atdabyde C-0 sh l690-1+8oCu
Ketout c=0st.
Gster I30-133seu
Caboryc aud c =0 &h =1780 -(o cu
(6 90 -l6 30n
Applicatioy 2R spealoßt ofy' tom fbatimd
oreecmstant
Bond atnength
oks law va
Ass aeprding to to
ma

K
(s) 27T Cmm/n m
whee
(i
two atims(?)
m,,m a bod i
t Aae fbaten tequey (v) a
nerease.
( e s < = < = ) a d hedueed mes (ue
O-H> -0)
a-Delei minalon the shape noleeule
brattod. Fo 'neale n-5 fonnon-luea
3-6 e o n enpod(6Qualitaune
anayi )
htnee of-bauols. wheli n a
5 ai ue
i i Moleula H-bondigp
6- istinetin bfo 2,uha
H-bendi
moleeuled ane
Whaatoa ene
vlbsalioal tianeilon
Wbuatoa Applud,
the tansibóu tiowa
couesperveling t li
sta
Ihe ibaatiönt istereild
qAond stali (Y) do themallbatt."
tndae
vibatioualleuet
D, l, 2,3-
thb -(V+ )hy egs;v-

Tranitiny
Gandls ae hoebn as velone
the

=2
he caleulatedl.
oveitouel ean

vibà co ANO maleeulks !


8. cal euate funtaetal odes NO -3x3-9
CO -Tolal3x3-9 q-52 4| Tronsa3
Rotalionel 2 vib"=
(linea) Trans. =3, Rotn=3
Rinazl|1) vib^ 9-6

2R Aclue
Vsbaalual
vmpouu &lali
at a higber fug- as tontad to sben
abipbs Ce
o solid stale. atit42 en
aolone 0ceus

aßsociaton n li
dpple-opole
whieh weakeus canbonyl bond plase)

Seet Soleti Pote sane


non-peen to fola solieut, tes ats EHano
Solpenta Heane |CAlouafo
1+13

non-pola to pola
tow

the xos t e t y bnd stenu


aleh weabs

3) Electhone dea-u to cleetnonie feea;


aneg HCHO cH cHO > cH-2-cHs
(1150eui) (1+4sei) (H5 ut )
weálniiy lc=o bond.hes, y deeeases a
Bond i-e.
k deerasey
Q. Heo DR speelia ceabonyl couydi (alelebyde /uelave)
Slali' vnpou slal asubdavee
abienbs at a highe
Ziy o solid statt.

opole agtociaton an
Dle
hieh acakew a bonyl bond

c/ Seluet! Pe-ttue sawe

Solvail: Hexane
|CAlso{o tanel
l426 n 113

pola to pota
s that to mon-
bond

eils --Du to eationde ffeeti; kk(4oecona sud


3 Electhone chane.

Poeg HCHOS cH CHO > CH2-cs


eauaes tI «4eel , then deeeases as
wealeniit lc=o bond.hees, y
bmd i-e.
k deearey.
can be eto as
R
(polar atrubie)
2 (I) tompanedtostrI

dble bodchavale
n
de to te Ae deteon
Heenee lordes.

olefiue
the
detocalisatis 'Bue
eaastocd,
enn
basgenadoubebond cbaracei,eanbony
tHhads wthy bingle bod
St
abkbs at lADt!
-C=

atead 1H8

Compa the eostr abs


4C=CH--!

( b-et)
Cougatieutdamiala
HYDROGEN 8ONDING!
’ broad banl
)atumokula H-bud gies Shant well
ines
Duta motseul Hboud

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