Download - 04 Spektroskopi UV-Vis 2
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ANALISIS INSTRUMEN ANALISIS INSTRUMEN II
SPEKTROSKOPI UV-VISSPEKTROSKOPI UV-VIS
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
PROSES ABSORPSI
•• Absorpsi sinar melalui 2 tahap:Absorpsi sinar melalui 2 tahap:
AbsorpsiAbsorpsi M + M + hh M* M*
Relaksasi Relaksasi M* M* M + M + heatheat
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
TIPE TRANSISI
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•• ** and and n n ** are high energy, short are high energy, short wavelength wavelength
transitions. transitions. -- ** < 185 nm (Vacuum UV) < 185 nm (Vacuum UV) -- n n ** = 150 – 250 nm (mainly vac. UV) = 150 – 250 nm (mainly vac. UV)
-- Very difficult to measure Very difficult to measure
•• n n ** and and ** 200 – 700 nm 200 – 700 nm
-- The most important and useful transitions in The most important and useful transitions in molecular UV spectroscopy. molecular UV spectroscopy.
-- Molar absorptivities (Molar absorptivities (): ):
n n ** 10 – 100 L cm 10 – 100 L cm-1-1 mol mol-1-1
** 1000 – 10,000 L cm 1000 – 10,000 L cm-1-1 mol mol-1-1
Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
Kromofor - Gugus yang menyerap radiasi sinar UV-Vis.
Auksokrom - Gugus yang tidak menyerap radiasi, tetapi dapat menggeser panjang gelombang maksimm atau
meningkatkan εmax
Pergeseran Bathokromik
Pergeseran Hipsokromik
Efek Hiperkromik
Efek Hipokromik
TERMINOLOGI
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
KROMOFOR
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
KONJUGASI
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
AUKSOKROM
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
CONTOH
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
CONTOH
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ORGANIK
Pengaruh Konjugasi
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ANORGANIK
• Anion np* nitrate (313 nm), carbonate (217 nm)
• Ion logam transisi (golongan B) menyerap pada daerah UV-Vis, proses absorpsi berasal dari transisi elektronik pada orbital 3d dan 4d.
• Seri lanthanide dan actinide : proses absorpsi terjadi sebagai hasil dari transisi elektronik pada orbital 4f dan 5f.
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Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ANORGANIK
![Page 14: 04 Spektroskopi UV-Vis 2](https://reader036.vdocuments.us/reader036/viewer/2022081419/563dbbc2550346aa9ab002dd/html5/thumbnails/14.jpg)
Analisis Instrumen I
~ Arie BS ~
~ Arie BS ~
Spektroskopi UV-Spektroskopi UV-VisVis
ABSORPSI OLEH MOLEKUL ANORGANIK