Ramanaiah, K V

Rao, N Rajeswara

Rao, S Mohana

English

IACS Institutional Repository

C H A N G E  IN  T H E  SH A PE  OF THF NO , ION DURING T H E  FORM ATIO N OF A HYDRATE IN AQUEOUS SOLUTIONSN. RA JESW A RA  RAO, K. V RAMANAIAH a n d  S. MOHANA RAO.PHYSK S DkPAKTMKNT, OsMANM l^ NI\I:I{MIT\ , IlVDKRMIAl)(RrCCtiJnl Anqusf PXio)T t  was n 'p o rtu il b y  Rajosw ara R a o  and R ainariliiaii (H K ‘4 )  th a t in a solution (>f s o d iu m  n itra to , th o  nitrat^o ion b iro iiu 'S  p y ra m id a l in slia])u a t about l() C  a n d  on b o a tin g  to  a b o u t 0 0 ' it Ix'oom cs p la n a r T l i is  conulusion \vas draw n to e x p la in  ( I ) a s lig h t inorease in  tiu^ fr(M|uency o f tlie to ta l s y in n u d rie  lint' r/v KioO cm  * a t lo w e r te m p o ra tn re  Avlu^re tin* ions ('an b<‘ exp<‘<'t(‘(l  to ix* h yd ra ttu l b<dt(‘r th a n  at higluu' tm nperatiiri* a n d  (2 ) ap])t‘ara n(‘(‘ o f a faint lin (‘ at- ( h  ~~ T)04 c-m w'lii(‘b disappears a t h ig h e r tt‘in]M‘ra t iir ( ‘s. ddH* lo n u a tio n  ol tlu ' hydn^gon b o n d in g  isevid encM d b y  th e  low' in U u is ity  of th is  liiu ‘ (i/v - lOoO cm  ^ at low^er t(Mu- p(^ratnr(\During tlu^  fonnation of hydrogiui liond, (Hie nonnally (u\p(‘cts 11h‘ bond Htrongiii of NO to  (lociraw'. riiciva-^t'il fiv(|iu'iicy ol tlir total symmetric Imf, hoW (wr, throws rtonht on tliis point. A normal coordinat(» ttvatim ait of pyriimidtil NO3 ion is mad(> aTid tin- foicc con.stnnl.s determined to settle this point.The F and (1 m atrices of pyramidal moh'cnk's are given hy VenkaWswarlu (1056). The bond Imigth tf of NO is taken to be 1.200 A.C. (Veiikatcswarhi) and the bond angle a  between the NO bonds is llR'Ol’' and the frequeneies are taken to be 504, 720. 1050 and 1420 cm b This data ate taken from a paper by some of tbe prt‘,sent authors referred to  earlier. If  one neglects (calculation iustifies such an assumption), the secular c()uation rcliices to two (luadratn; equa- t io n s tb a t can be remlily solved. T l i e  force con.Hlants thus obtained nre/rf 7.127, /rfj r-0 .i!30 , l.blH, 0.233 in units of 10*^ dynes/ciu. Conqiarmgw ith U  -  -  L2S1 and -/„„) - o 2335. reportisl by Veiikateswarlufor planar NO , ion, U  ^he tormationof hydrogen bond.' Therelore. though tlie total svmmctric stretch line slightly shifts to highei frequency, on hydration, the bond strength really disTeases.]{ E F E It E N (' E SRajeswara Rao, N. and Raraaniali, K. V.. li«)4, Jnd. ■). l-'hys., 38. 144.Venkal.ppwnrln. K., I ’m-.. Ph;i«. Nor. Loml. 69. !«<•22453

Change in the Shape of the No3 Ion During the Formation of a Hydrate in Aqueous Solutions

http://arxiv.iacs.res.in:8080/jspui/bitstream/10821/2555/1/Change%20in%20the%20Shape%20of%20the%20NO3%20Ion_N.Rajepwara%20Rao.pdf

Change in the Shape of the No3 Ion During the Formation of a Hydrate in Aqueous Solutions

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