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preface to fifteenth edition

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SPECTROSCOPY 7.23<br />

TABLE 7.13<br />

Solvent<br />

Solvent Correction for Ultraviolet-<br />

Visible Spectroscopy<br />

Correction, nm<br />

Chloroform<br />

1<br />

Cyclohexane<br />

Diethyl ether<br />

11<br />

1,4-Dioxane<br />

5<br />

Ethanol 0<br />

Hexane<br />

11<br />

Methanol 0<br />

Water<br />

8<br />

TABLE 7.14 Primary Bands of Substituted Benzene and Heteroaromatics<br />

In methanol.<br />

Base value: 203.5 nm.<br />

Substituent<br />

Wavelength<br />

shift, nmSubstituent<br />

Wavelength<br />

shift, nm<br />

9CH 3 3.0 9COOH 25.5<br />

9CH"CH 2 44.5<br />

<br />

9COO 20.5<br />

9C#CH 44 9CN 20.5<br />

9C 6 H 5 48 9NH 2 26.5<br />

9F 0<br />

<br />

9NH 3 0.5<br />

9Cl 6.0 9N(CH 3 ) 2 47.0<br />

9Br 6.5 9NH9CO9CH 3 38.5<br />

9I 3.5 9NO 2 57<br />

9OH 7.0 9SH 32<br />

<br />

9O 31.5 9SO9C 6 H 5 28<br />

9OCH 3 13.5 9SO 2 CH 3 13<br />

9OC 6 H 5 51.5 9SO 2 NH 2 14.0<br />

9CHO 46.0 9CH"CH9C 6 H 5<br />

9CO9CH 3 42.0 cis 79<br />

9CO9C 6 H 5 48 trans<br />

9CH"CH9COOH, trans<br />

92.0<br />

69.5<br />

Heteroaromatic<br />

Base value,<br />

nmHeteroaromatic<br />

Base value,<br />

nm<br />

Furan 200 Pyridine 257<br />

Pyrazine 257 Pyrimidine ca 235<br />

Pyrazole 214 Pyrrole 209<br />

Pyridazine ca 240 Thiophene 231

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