Chhonkar, M S

Mookherji, A

English

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J l e i t e t i  t o  t h e  £ id U t o tTht Board of Editors wdl nol hold itself responsible for opinions expressed in the l e f t c r v  published in this section The notes containing reports of new work communicated for thi'< section should not contain mang figures and should not exceed oOO words in length. The contri­butions must reach the Assistant Editor not later than the 15th of the second month preceding that of the issue in which the Rafter is to appear No proof will he sent to the authors.ANISOTROPY OF WATER CLUSTER ABOUT THE Gu'' IONA MOOKHETIJT AMD JVI. S dHlIONKAltriIY S j(3S  hAUOitATOltY, A g UA C!()LLKfU0, AcillA (Receioed. Januaig !), 1900)The ^roniul sUite ot (hr' i loii "D5/3) iu ocUihedrally ro-ordiiiated Halls uiidej the iiilliieiice of the iisual ty])e ol enbic crystalline electiie field wit li jiositivi' coellicieiit (Van VIeck, 19112, Sehlap]) and Penney, 19)12 and Gorier, 1942) splits into an oibilal dnublei and triplet above* it.Beevers and Lijison (1934) Jiave shown that the watei cluster about the*  ^ ion has the apjiroxiiiiat-e tetra^nnial Hymmeiry and hence according to tin* thoories of Polder (1942), Ahragrain and Piyee (1951), Bleaiiey H a l .  (1955) and Bose f t  at .  (1957) the ionic magnetic anisotro}iy of the inn is given byK, ~  A \l -T) . iywlieri* A'II and 7i\ ai‘e the lonic' snseoptihiliticK parallel and normal to tln^  tetragonal axis respoctivoly; D — ( - 1 - * 1  )• whore tj\\ and are the\ fij I -ftx 'energy diffproni;es of the lowest basic doublet and the two tetragonal levids respectively of the tri])let, aud _P is the covaleiicy laeior (Owen, 1955).Oil]* measurements of the absorjition speetra of Gu++ ion in (ojiper sulphate iu aqueous solution at first sight show that there is only one band having maxi­mum at; 12,400 rni“ ,^ but a elosor examination of the absorption curves (fig-1) shows that there is another inaximuni at about 12,000 eiu~ .^ The second maximum is directly noticeable, though it is not very prominent. There is a great deal of ex]ierimenial evidences (Ballliaiissen and Jorgensen, 1954) that' the ahsorplioii147148 Letters to the Editor(iirvos of f n ] i n c  i o n  in acjueons solution in diffcM'cnt amino copper comploxos consist of at least t\vf> (liscennlile bandsIf tins separation is taUmi to b(‘ due to lh(‘ tetragonal eonpmnent of the crystal li(‘ld tben tnie < an cale,nlat(‘ /), whieli when substituted in tlu' above* expression v\'dl ^ive IP Now aee-oidinj  ^ to Ow(*n's tindin(/;s and also of ours (Mooldieiji and dhhonkai, Ittfib) /“” in (hiSO  ^ aepieous solution is 0 85 which jj;ivcs directly A A' in solution state fm the water eJuster about t lie Cu+^  ion Since wo have found in our stinlies of nie-kel salts (MookhcM’ii and Ohhonkar. in course of publication) AK in state (jf solution anri in erystalliiic state does not differ appreciably and hence our evaluatcrl value of AK in ease of CuHO  ^ solution should agree with that-of crystal value of AA'(Ih)se rf rd. 1957) provided that our optical findings are correct-. AK - 54H 4 10"^ ' at 1100" A' as obtained by Bose nV (1957) from magnetic studies agrees well with oui calculated value of AK - 548x10“” fit- the same temperature and hence we conclude that the (irst and second maxiinu are due to tetragonal sjilitting \tSinc(! OUI assignment- agrees well with the inagnet-ic lindmgs u'c liave'  ^cah'iilated /-  evaluating A A' from our optical measurements and utilising Bose et fd (1957) magnetic AK -values They are given in Table I. We find that / “ -values are of the right order and almost the same for all the salts studied in agreement with the suggestions of Bose pt (d. (1957) lor these saltsTABLE JSulpha l-(^  HPVip.sPcntahyOratcN 1C ’NTH4 Kb Ti Zn-K 0 sr» 0 SK (I 70 0.870 O.KI O.HSSelonatcPoiitnhyrlrnt-p K0 S(5r. 0 88 0 83R E E R E N f  ) E SAbragmin, A. ami Piycc, M. H L ,  1051, iVon. B o i /.  iSoc , A206, 105.Bloauoy, M., Bowers, Jv. D. anrl Piyoo, 10.55, J^ror h 'oij. S o c  , 228, 100,Bobo, A., Milra, S. K and Dul-ta, 8 K ., 1057, P ro r . H o y . S o c ., 239, 105.Bjerruin, .1., Ballhauson. 0. .t. and dorgoiiHon, 1954, A r tn  O h rm  S m m h , 8, 1275. Boovcth, C, a . and Lipson. H .. 1034. P r o c . H o y . H oc., A146, 570.(tort-cr, (t 1032, P h y s ,  HexK, 42, 437.Mookorji, A. and Ohhonka-r, N. 8,. 1950. h id . J tm v . P h yn ., 33, 7 4 ,PoUliM-, I)., 1042, P h y s ik a , 9, 71.3Schlapp and Poimoy, 1032, P h y s .  R p v . , 4l & 42. 104 & 060.VaeClock, J. pT., 1032, Tho Thoory of (»lootrio and magnotio Buaoapt-ibilit.ie.s. Oxford ProHS,

Anisotropy of Water Cluster About the Cu++ Ion

http://arxiv.iacs.res.in:8080/jspui/bitstream/10821/2291/1/Anisotropy%20of%20Water%20Cluster%20About.pdf

Anisotropy of Water Cluster About the Cu++ Ion

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