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Spectroscopic Studies on Electron Donor‐Acceptor Complex between n,2,4,6‐tetranitro‐N‐methylaniline and ethylenediamine
Author(s) -
Raha K.,
Makashir P. S.,
Kurian E. M.
Publication year - 1991
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.19910160203
Subject(s) - ethylenediamine , chemistry , acetonitrile , molar absorptivity , electron acceptor , acceptor , stability constants of complexes , inorganic chemistry , photochemistry , organic chemistry , aqueous solution , physics , optics , condensed matter physics
Spectroscopic studies indicate that N,2,4,6‐tetranitro‐N‐methylaniline (tetryl) forms two charges transfer (CT) complexes with ethylenediamine (EDA) and these complexes show absorption maxima at 440 nm and 340 nm respectively. Both the complexes have 1:1 ratio of donor to acceptor. The formation constant and molar extinction coefficient for the complexes have been determined in acetonitrile as well as in ethanol and methanol to evaluate the effect of polarity. The initial complex (λ max at 440 nm) undergoes transformation to a product complex (λ max at 340 nm) when the EDA concentration is lowered. The product complex has been isolated and characterized by IR, UV spectroscopy, thermal analysis and X‐ray diffraction (XRD). The transformation of the initially formed CT complex to the product complex in solution has been found to obey first order kinetics. The formation of CT complex of tetryl with EDA has been succesfully used to develop a spectrophotometric method for the quantitative determination of tetryl.