SPEKTROSKOPI SENYAWA ORGANIK
description
Transcript of SPEKTROSKOPI SENYAWA ORGANIK
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SPEKTROSKOPI SENYAWA ORGANIK
KIMIA ORGANIK II
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Mengapa belajar spektroskopi? Penentuan struktur
SPEKTROSKOPI INFORMASI YANG DIDAPAT
MASSA UKURAN DAN RUMUS MOLEKUL
INFRAMERAH JENIS GUGUS FUNGSI
ULTRAVIOLET ADA/TIDAK ADANYA SISTEM ELEKTRON p TERKONJUGASI
RESONANSI MAGNETIK INTI KERANGKA KARBON-HIDROGEN
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SPEKTROSKOPI MASSA Mengukur massa (BM) Informasi mengenai struktur
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Spektrum massa
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Interpretasi spektra massa Info penting: BM senyawa.
(Cont: heksana 86, heksena 84, heksuna 82) Spektrometer massa fokus ganda (resolusi
tinggi): mengukur massa sampai 4 angka di belakang koma rumus molekul dapat ditentukan. (Cont.: C5H12: 72.0939 ; C4H8O: 72.0575).
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Awas! Yang teramati adalah “exact mass”,
bukan “molecular weight”
O
OH
O
O
Chemical Formula: C9H8O4Exact Mass: 180.0423
Molecular Weight: 180.1574m/z: 180.0423 (100.0%), 181.0456 (9.7%)
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Kelimpahan alami beberapa isotopIsotop Kelim-
pahan (%)Isotop Kelim-
pahan (%)Isotop Kelim-
pahan (%)
1H 99,985 2H 0,01512C 98,89 13C 1,1114N 99,63 15N 0,3716O 99,76 17O 0,0432S 95,0 33S 0,7619F 100
35Cl 75,5 37Cl 24,579Br 50,5 81Br 49,5127I 100
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Massa eksak beberapa isotopIsotop Massa
(amu)Isotop Massa
(amu)Isotop Massa
(amu)
1H 1,00783 2H 2,0141012C 12,00000 13C 13,0033614N 14,0031 15N 15,000116O 15,9949 17O 16,999132S 31,9721 33S 32,971519F 18,9984
35Cl 34,9689 37Cl 36,965979Br 78,9183 81Br 80,9163127I 126,9045
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Interpretasi spektra massa Ada senyawa yang ion molekulnya (M+)
sangat tidak stabil sehingga tidak teramati. bisa diatasi dengan ‘ionisasi lunak’.
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Interpretasi spektra massa Spektrum massa dapat digunakan sebagai
‘sidik jari molekul’ dibandingkan dengan data ‘library’
Pola fragmentasi: informasi penting bagi penentuan struktur.
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Soal latihan 12.2
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Gugus Fungsi & Fragmentasi
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Soal latihan 12.3
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SPEKTROSKOPI DAN SPEKTRUM ELEKTROMAGNETIK
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Spektroskopi Inframerah
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Spektrum IR
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Manfaat spektrum IR Identifikasi gugus fungsi “Sidik jari” senyawa
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Serapan khas gugus-gugus fungsi
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SPEKTROSKOPI ULTRAVIOLETp. 500 - 503
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Transisi elektron
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Spektrum UV
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Soal latihan
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Soal latihan 14.13 14.14 14.30 14.31 14.46 14.47