Loges

Using napierian logarithms (loge = In), Equation (9.27) can be rewritten ... 

Pteridine pAT, max UV absorption spectra loge pH Solubility 20 °C in H2O 100 °C Melting point (°C)... 

X y Amax (nm) (loge) Amax (nm) (loge) Amax(nrn) (logc)... 

The common logarithm (base 10) is denoted log a or logi(/7, The natural logarithm (base e) is denoted In a (or in some texts loge ). 

Acriflavin Mixture (Euflavin, 3,6-diamino-lO-metbylacridiniuni chloride) [8063-24-9] M 259.7, m 179-181 . Purified by dissolving in 50 parts of H2O, shake with a small excess of freshly ppted and washed Ag20. The mixture is set aside overnight at 0 and filtered. The cake is not washed. The pH of the filtrate is adjusted to 7.0 with HCl and evaporated to dryness. The residue is then crystd twice from MeOH, twice from H2O and dried at 120 X ,ax at 452nm has a loge value of 4.67. It is a red powder which readily absorbs H2O. The solubility is increased in the presence of proflavin. The dihydrochloride is a deep red crystn powder. It is available as a mixture of 3,6-diaminoacridinium chloride (35%) and its 10-metho-chloride (65%). [see Albert, The Acridines Arnold Press p. 346 1966 Chem Ber 45 1787 1912]. 

Bromoindole [10075-50-0] M 196.1, m 90.5-91°, 90-92°, pK 16.13 (NH). Purified by steam distn from a faintly alkaline soln. Cool the aqueous distillate, collect the solid, dry in a vacuum desiccator over P2O5 and recryst from aqueous EtOH (35% EtOH) or pet ether-Et20. MeOH 279, 287 and 296 (loge... 

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These results were in fair agreement with the experimentally determined values for the parent compounds in nonionio solvents. Additional values for the n it transitions have been determined for pyrido[3,2-d]pyrimidine (345 mp loge 2.07) and for pyrido[4,3-d]-pyrimidine (330 mp, loge 2.49). ... 

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