Saxena, J P

Tandon, K

Tandon, S P

English

IACS Institutional Repository

J l e t t e t i  t o  t k e  I d i t o tT k e  B o a r i  <,/ M iU o r e  d e e .  n o ,  h old  i 'e e l j  r e s p o ,u ,U e  Jor ....... .ton'll ‘r  "*■, 0/ onylno, , ........W (/..  T h e  e m l ^ b n l y e  r e a c h i ,^  ,h e  S ee reU .ry  b y  the U , h  o j  a n y  l e  „ y ,e e ie dto  a p p e a r  i n  the u e u e  f o r  the n e x t  n u m th . N o  p r o o f m i l  be sen t to the anihor.22S T U D Y  OF LIG H T  A B S O R P T IO N  IN 8 H YPRO XY-l-M ETIIYL O U IN O L IN IU M  H YD RO XID E ANHYDRO-SALT IN ST A T E  OF SOLUTIONS. P TANDON*, K . TANDON** anii J J‘ . NAXENA**ILnivkhsity of JoDHPul;, rJornjpui;. 1m .j\{ J i i c i t v c d  O f t o l n r  1 HMiri)Tliougli tliu gouural iocituros ol tliu spoctnnu of sonu' of Mio plu'nol-bc'taiiK's liav(3 lioon (loscribcil (Phillips arid Kiiowa, IDhJ; Saxcna el nL 1051)). no Hystojimlm study o f ilio cliaracteristius and assigninoiiis of ih(‘lr ah,sorption hands has lu'C-n roiiortcfl so far, Tho pivsnii (Mnnnumioation U'ports jirohahli* assigninonts lor tho ba,iids o f 8-hydroxy-l-ru‘thyl quinolinnun hydroxido anhydio-salL, ohsi rvud in tho region 185-600m/y ha,sod on oharactoTistics and iidhu'ino oi ,solv(‘Jit on them .Four bands at J81S0, 26670, 114480 and 4II50cnr i  nurndVd i\ ith anUVISPEK s|K'otroj)hot(»niC‘tor in tho oaso ol S-hydroxy-l-inotliyl i|iin)o]inimn hydroxide anhydro-aalt prepared by tho method descrih('d l>y Saxena el nl (1050) dissolved in chlorofonnTlie intensity (molar extinction cooflieient, l 10-, osullator Htrength coupled with blue-shift ol the 18180 om-i hand ~  SOOn cm  ^ in ebauging the sol­vent from chloroforni to ethanol clearly indicates it to hu duo to a Ibihidilon n ^ n *  transition. The w-orbital is presumed to bo localised predominantly near phenolic oxygen Hence this transition diminislios eleotron density noai' the region o f  ?t-orbital. The presence o f hydrogen bonds jilaces a positive charge near oxygen atom making it more difficult to remove Um' oloctron from the nou- honding orbital. This explains tlio hluo-shift of tho hand m hydrogori-hondmg- solvents (Strickler and Kasha, 1904 ; Mookhorji and Taiidon, 1905),♦♦Chemical laboratoriee. ♦Physical laboratories.669670 Letters to the EditorThe band at 26670 has intensity (e •-v- 10®; /  ~  10“ *) Buggesting it to bo duo to an allowed transition. The solvent effect is siinilar to the 18180 cin“ i band. Hence the band may be assigned to an allowed n—>7t* transition.The bands at 34480 and 41160cm~^ are intense (c ~  10‘ ; /  10^ )^ andexhibit typical red shift in solvents o f increasing polarity and having large hydro­gen bonding power (McConnell, 1962). Hence they may be due to allowed transitions.The study o f these bands using polarized light in solid stati*, and teclmiipie o f diffuse reflectance in jiowder state is in progress. An attempt is also being made to evaluate the various molecular orbitals involved.The authors wish to thank Prof. It. C Kapoor, Head o f thci Chemistry Doparliw ment for providing the facilities for the nork 'II E F  E It E N C E SMcComioll, H , 1952. J Uhem. Ph/s., 20, 700.Mookfior]!, A Mini Taiidoji, iS. 11)0.5, Indian J Phya., 39 137, 390 Phillips, •). 1^ . Huil ICoowii, R. W  , 195], J. Avi. Chem. Hoc . 73, 5tS3.Saxomi, J. J*., Stivflord, ^N. II. and Stafford, W , L ,  1959, J Chem. Hoc., 1579 Striddor. S. .1 and Kasha, M.. 1964, Molecular Orbilalt /m Chcmistiy, Phyaia and Biology, Academic I*ross, Inc, New York, ]i 241.

Study of Light Absorption in 8 Hyproxy-1-Methyl Quinolinium Hydroxide Anhydro-Salt in State of Solution

http://arxiv.iacs.res.in:8080/jspui/bitstream/10821/2824/1/Study%20of%20light%20absorption_S%20P%20Tandon.pdf

Study of Light Absorption in 8 Hyproxy-1-Methyl Quinolinium Hydroxide Anhydro-Salt in State of Solution

Abstract

Similar works

Full text

Available Versions

IACS Institutional Repository