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Charge-transfer complexes of chlorpromazine in solution: A conductimetric study

✍ Scribed by F. Gutmann; H. Keyzer


Publisher
Elsevier Science
Year
1967
Tongue
English
Weight
442 KB
Volume
12
Category
Article
ISSN
0013-4686

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✦ Synopsis


A conductivity titration method has been used to investigate the electron-transfer activity in the charge-transfer complex= formed in a&o&rile between the donor chlorpromazine and the acceptors 2,3_dichloro+-dicyauobeuzoqu@one, tetrachloro-1,4quinone, tetracyanoethylene, and 7,7,8,8_tetracyanoquinodimethane.

The stoichiometry of all these complexes was found to be 1: 1. In general, the conductivity maximum obtained during the complex titration corres onded to the polarographic reduction potential of the acceptor determined in acetonitrile rather tL to it9 absolute electron atEuity Aa.

The anomalous behaviour of the chlorpromazine:tetracyanoethylene complex is probably due to decreased steric hindrance from the chlorpromazine sidechain.

R&mmd-La tendance au transfert au transfert tlectronique des complexes de transfert de charge du donneur chlorpromazine aux accepteurs 2,34ichloro_5,6dicyanobenzoquinone, tetrachloro-1,4benzoquinone, tetracyano&hylene et 7,7,8,8-t&acyanoquinodim&hane, dans l'a&tonitrile, est &ud%e par titration conductim&rique.

La stoechiom&rie de ces complexes est du type 1: 1. Le pit de conductivit6 se manifestant dans la titration correspond g&&alement au potentiel de r&luction polarographique plut8t qu'a l'affinit6 dlectronique absolue, AG. Le comportement tigulier du complexe chlorpromazinetttracyano-&hyl&ne est dfi, probablement, B la diminution de l'emp&hement st&ique de la chaine la&ale de la chlorpromazine.

Z-sung-Die

Elektronen-ubertragungstendenz der EDA Komplexe des Donators Chlorpromazin mit den Akzeptoren 2,3-Dichloro_5,6dicyanobenzochinon, Tetrachloro-1,4chinon, Tetracyaniithylen und 7,7,8,%Tetracyanochinodimethan, in Acetonitril, wurde mittels Leitfiihigkeitstitrationen untersucht. Die StaChiometrie all dieser Komplexe ergab sich als 1: 1. Das bei der Titration auftretende Leifffiigkeitsmaxim um entspricht im allgemeinen, dem polarographischen Reduktionspotential und nicht der absolutem ElektronenaGnitiit AQ. Das abnormale Verhalten des Chlorprornazin Tetracytithylen-Komplexes ist wahrscheinlich durch eine verringerte-Hinderungsterische der Chlorpromazin-Seitenkette-verursacht.


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