espectros UV-visível, Esquemas de Química Orgânica

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ULTRA-VIOLETA

ULTRA-VIOLETA TABLE 10.1 SOLVENT CUTOFFS Acetonitrile 190 nm n-Hexane 201 nm Chloroform 240 Methanol 205 Cyclohexane 195 Isooctane 195 1,4-Dioxane 215 Water 190 95% Ethanol 205 Trimethyl phosphate 210 TABLE 10.3 TYPICAL ABSORPTIONS OF SIMPLE ISOLATED CHROMOPHORES Class Transition Amax(nm) loge Class Transition Ama (nm) loge R-0H n> 6* 180 2.5 R-NO, n> 1* 21 <1.0 R-0-R n> 0* 180 EE) R-CHO n— m* 190 20 R-NH, n> 0* 190 3.5 n> 1% 290 1.0 R=SII n> 6* 210 3.0 R;Co > q* 180 3.0 R5C=CR; > 1* 175 3.0 n> 1* 280 1.5 R-C=C-R n> 1* 170 3.0 RCOOH n> 1* 205 1.5 R-C=N no n* 160 1% 340 <1.0 RCONH, n> 1% o 1.5 TABLE 10.5 EMPIRICAL RULES FOR DIENES Homoannular Heteroannular (cisoid) (transoid) Parent A=253 nm A=214nm Increments for: Double-bond-extending conjugation 30 30 Alkyl substituent or ring residue 5 Exocyclic double bond 5 Polar groupings: —0COCH; 0 —OR 6 6 —CI, —Br 5 —NR, 60 60