Gupta, Jagannath

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ON THE POLARlSATlON OF RAMAN LIKES OF FORMIC ACID, AND FORMATE AND TRICHLORACETATE IONS. BY JACANNATH CUPTA. (l'alit Research Scholar in Chtmiatry .) (Plate XIS. )  ABSTRACT.-'l't~t rlvgrtu.c; ul d~prl;htis~liclll uf illr pa~rnliurrl l  H~nlait  linvh 1 1  formir atid nnrl d wdiuiri for.11atc nnrZ srnliutia trirlllr~rm~r.tntr it1 aquruu* rulutitmr have been ~neaserrtl, using a dwWu-iluogc prisnt iu rcrwrd tlic two ~ o l ~ ~ p e n t b  simtl~taJ1~~8~!' and deter~nining thr: rtlativc intetraities ul the mnrpmcntb uith tire help d hlacteaiogbg tintcnsity) curves. It iri fuuud thnt thc Jcgrce uf dcpularisatiun af the line 1398 ml-I d formic at i l l  is -31, rvl~icla i s  rt~uch grtattr t h a ~  tbat of either Ihr line '353 rni'l of h r u  iorm.k ur the liue rjfu ~811-1 uI s~wliuitt richlumcultatc.. This fact indicates positively that Che origit! uf the line 1353 cm-1 r)f wdiutl~ furmatt. i s  diffvmnt from that d tbe line 139& Of f-k acid. The- agteenleut k t tvew the values of p of the line 13s cm-1 of d a m  foralate bulntion a d  of the line 1 3 ~  cub-1 of sodium trichloraatatr mlntion goes ta show tbat the b m  w e  their origin ta the same mude of vibration of the m h l  group. I N T R O D U C T I O N .  It is well known that the degree of depolarisation p, of a Kanian line is an un~~dstakable guide to the understanding of the vibratim which causes h a p m m  of the line. Inspite of the fact that the ~ueasurcalcat of of, is m d -  ingEy difficult, the polarisations of Lhe Raman l ine of a large nurabcr of sub stances have been succdully investigated by s e d  workers using thr: n w  rl~ethds of photographic pl~otorlletry of spectral lines, and in Strw 1\1rw the rcsulu can bt: itlterprcted, it his lxu found that they arc in agrwllreut with thw expected from thc theoretical poitlt of view. Attempts to interpret and make a canpararive study of thr. Kanm qwAra of carboxylic acids and those of their metallic selb iu suIuliou tirw lwen 111sde ouly r-tIy. An examination of the Kaulan speftrunl d trichlocyr~tic acid Id Kohhusch to suggest for it the structure as promd by Ikntesclh * for t k  fatty acids. A marked d1lerace ktween the tr~r-truzn of a yurt: acid llurl that of its metallic salts in solution ld Peychb to put forward the view that tbe angle htween &e two (C - 0) h d s  in- in auluticll~ when the d t  is iaM. All these vims have h dimxud and ezbderl by the w t  auttot ju n ~revious paper.' It is evident that the corrtxLtlm~ of the hypotltaw mentioad mbow mi h tested by m s k b  a colupfutive st* uf 2he v a l u  uf p, tbr: *roe d 

ON THE POLARlSATlON OF RAMAN LINES OF FORMIC ACID, AND FORMATE AND TRICHLORACETATE IONS

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