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Charge transfer bands of polynitroaromatics-diphenylamine systems
Pergamon
SpectrochimicaActa, Vol. 51A,No. 4, pp 733, 1995 Copyright© 1995ElsevierScienceLtd Printed in Great Britain. All fightsreserved 0584--8539(94)00152-9 0584--8539195$9.50+ 0.00
SHORT NOTE
Charge transfer bands of polynitroaromatics-diphenylamine systems (Received 15 September 1993; in final form 8 June 1994; accepted 13 June 1994)
The charge transfer maxima of a series of polynitroaromatics-aromatic amine systems have perhaps been reported for the first time. Due to the weak nature of these complexes such bands are usually masked. Therefore, charge transfer is inferred from complementary data also, like association constants. The quantitative data obtained is as follows. 2max (ca) for diphenylamine complexes: nitrobenzene (NB), 320 nm; o-dinitrobenzene (oBD), 334nm; m-dinitrobenzene (mDB), 320nm; p-dinitrobenzene (pDB), 325nm; 1-chloro-2,4dinitrobenzene (CDB), 328nm; 3,5-dinitrobenzoic acid (DBA), 318nm; 2,4-dinotrotoluene (DNT), 324 nm. All spectra were carried out in carbon tetrachloride except DBA which was carried out in ethanol. The equilibrium constants derived from the Benesi-Hildebrand equation in CC14 (ethanol in case of DBA) are as follows: DBA, 1.56; CDB, 1.4; pDB, 1.34; mDB, 1.23; NB, 0.8; DNT, 0.8; oDB, 0.15. The inferred electron affinities from charge transfer bands for compounds with electron affinities not known are are as follows: DNT, 0.64; CDB, 0.90; NB, 0.50; DBA, 0.68. The full paper has been deposited with the British Library at Boston Spa, Wetherby, West Yorks, U.K. as Supplementary publication No. SUP 13091 (12 pages). Persons wishing to obtain copies of deposited material should write, citing the accession number, directly to Service Enquiries, British Library, Boston Spa, Wetherby, West Yorks, LS23 7BQ, U.K.
Acknowledgements--We thank Professor A. A. Khan, Chairman for Facilities. Department of Chemistry Aligarh Muslim University Aligarh 202002, India
PUSHKIN M. QURESHI'~ S. MUZAFFARALl ANDRABI
t Author to whom correspondence should be addressed. 733
SpectrochimicaActa, Vol. 51A,No. 4, pp 733, 1995 Copyright© 1995ElsevierScienceLtd Printed in Great Britain. All fightsreserved 0584--8539(94)00152-9 0584--8539195$9.50+ 0.00
SHORT NOTE
Charge transfer bands of polynitroaromatics-diphenylamine systems (Received 15 September 1993; in final form 8 June 1994; accepted 13 June 1994)
The charge transfer maxima of a series of polynitroaromatics-aromatic amine systems have perhaps been reported for the first time. Due to the weak nature of these complexes such bands are usually masked. Therefore, charge transfer is inferred from complementary data also, like association constants. The quantitative data obtained is as follows. 2max (ca) for diphenylamine complexes: nitrobenzene (NB), 320 nm; o-dinitrobenzene (oBD), 334nm; m-dinitrobenzene (mDB), 320nm; p-dinitrobenzene (pDB), 325nm; 1-chloro-2,4dinitrobenzene (CDB), 328nm; 3,5-dinitrobenzoic acid (DBA), 318nm; 2,4-dinotrotoluene (DNT), 324 nm. All spectra were carried out in carbon tetrachloride except DBA which was carried out in ethanol. The equilibrium constants derived from the Benesi-Hildebrand equation in CC14 (ethanol in case of DBA) are as follows: DBA, 1.56; CDB, 1.4; pDB, 1.34; mDB, 1.23; NB, 0.8; DNT, 0.8; oDB, 0.15. The inferred electron affinities from charge transfer bands for compounds with electron affinities not known are are as follows: DNT, 0.64; CDB, 0.90; NB, 0.50; DBA, 0.68. The full paper has been deposited with the British Library at Boston Spa, Wetherby, West Yorks, U.K. as Supplementary publication No. SUP 13091 (12 pages). Persons wishing to obtain copies of deposited material should write, citing the accession number, directly to Service Enquiries, British Library, Boston Spa, Wetherby, West Yorks, LS23 7BQ, U.K.
Acknowledgements--We thank Professor A. A. Khan, Chairman for Facilities. Department of Chemistry Aligarh Muslim University Aligarh 202002, India
PUSHKIN M. QURESHI'~ S. MUZAFFARALl ANDRABI
t Author to whom correspondence should be addressed. 733