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A scientific niccting wns licld at, I3urlington House on r ' L liurstliiy, JInrcli 16, 1939, tit 8 p.m. 'l'lic Z'rcsidcnt, Prof, F. G . Doillinn, C.R.E., l).,Sc., TATA.l)., F.R.S., w i s in tlie Chair. l h . J. J. Fox tliwussctl : I--red Spectra in the 3p Region of Naphthalene, a-and p-methylnaphthalenes, Quinoline and Iso-Quinoline : anAid toAnalysis. [By J. J.Fos and A. E. NAI~TIS.] Absorption spcctra of nnplithnlcnc, quinoliuc, isoquinolinc and a-and ~-mcthylnnphthnlcncs in carbon tetrachloride solution liavc bccn esiilnined in the region 3.6 to 3.8p, with sufficient resolution to give all details of the bands. The first threc coinpounds have a region of absorption, with somcwhnt coinplcs structurc, at about 3-27p, arising froin CH groups, while thc remaining two compounds linvc in addition, nt longer wavclengths up to 3-5p, a sct of bands attributablc'to the CโฌI, group. The spectra of quinolinc and isoquinolinc difler sulficicntly to bc used as a means of identification and cstiniation. Quinolinc ant1 a-methylnaphthalcnc huvc spcctru which in sonic ways rcsemblc those of simplc bcnzciic dcri~iiti~cs in tbc 3 -27p region, wlLilc iso-quiiiolinc and ~-11ictliylnap11th~leuc iirc morc like naphthnlcnc. It is pointcd out that tlic m.p.s. of these p-substituted compounds, although lowcr than naphthalene, arc considerably higher than tlic a-substitutcd conipouuds, and this appears to bc general.
Dr. A. 15. Miirti11 said : A ClI, group lins two CII vnlcncy vibrations close to 3000 cin.-l, tlic lower one synirnetrical rind tho otlicr nlitis~mliictricirl. In CIl,D and tlic iiicthyl Iirili(lcs tlic frequencies arc aliout 2!)70 ant1 3050 cni.-l, and siiicc tlic frequciicp difrcrenccs bctwccn CEI,l) and thc hrilidcs iirc smn11, wc conclude that thc const:iiits of tlic CH, groups iirc siiiiiliir. Tlic
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Tlic iiiniiiifiictiirc of soap Ilr~kcs to givc qiiiclc soliiMity, grniiiilritctl soiip products prcpnrctl by sprity drying, iilso iiiillctl soiips, :ire soiiic of blic chief dcvclol~iiieiits i i i rccciit yc:irs. Although soiips Iiitvc 1)ccii iiiiprovcd i i i iiiniiy wnys, t h y Iinvc ccrtniii liiii