This paper deals with the raman spectra of oxalates and oxalato-complexes.@IAC

Gupta, Jagannath

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RAMAN SPECTRA OF OXALATES AND OXALATO- COMPLEXES : VIBRATIONS OF DICARBOXYG. BY JACANNATH GUPTA, Palit Research Scholar in Chemistry. dB8TRAm.-Tn mtlarratioa of the aatbor'a work on tbe Roman a m  of o d i c  arid md metallic oxnlaks, the oxalato cnrnplmes of alamininm and titanium haw km examimd with a view to testing the validity of the views on the stracttlrc af the i o n i d  carkmxyl $map p t  forward in previous papera. A gwcraf clwlirmation hm k e ~  obtained, in a'- of certain rtmnrkable changes h m d  ia tbe apcdra of the oxalate v p ,  such M tbc disappea~~ncc of the line r;lo6 and the b d  16m of the oxalate ion, and the appcaraace af lmcs 1680 and 1730, in the spedmm of putsmiam ahrt~ino.axalatt. The 8 N a  alm revert1 the lens stable character of the titanium complex. An attempt haa hen made to chamctuiw the m& d ~ i l l e t i w s  d the [GO,) ion and identify them with the Ramm l i n a  of the melatts, on tk basis nt vibretiom of the ethylene m o h l t ,  andyed bp 0th- workma. A h ,  fmm at appearam of h-a lines 1680 and 179 In the specha of Zbe aomplw, h p h  d only observed in the cw oi the esters, it i~ anggestcd that in the complex, the two rarbonyl link- am of different energy -tents, and hence the possibility of existence d an in-ding fum of immtrism is pinted oat. The crystal structares of mhfirous d i c  add,' ih dihydmte,*aad s c m l  metallic oxalates, both normal and acid, have been studied by tht uatat methods of X'ray ana1ysis. The general conclusicw arrived at, from a detailed study of the Weisenberg photographs is &at, except in the eesc of ammonium ozalate" which is slightly exceptional, the six atoms af the ionic group (C404) lie in f k  same plane. In oxalic acid dihgdrate, Zachnriasen's measnments &ow that the four oxygm atoms arc equialent, the distptlm k i n g  C - C ~ I ' ~ ~ ~ ,  ~d C - 0 -  r'zSA. The mibi l i tg  of cl~otdbatiw of e ~ c h  of the hydmaen a t m s  between two mpgm etwns in nnhyd~lus -lie srid hms k n  painted o ~ t  bg Headricha. Similar ccacl9dmfi were at by the premnt author fmm the WY the h m  apsct~ of -$it acid rad m d i c  -latea in d i ,  4 

RAMAN SPECTRA OF OXALATES AND OXALATOCOMPLEXES : VIBRATIONS OF DICARBOXYL

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