Synthesis and spectral properties of autocomplexes of the nitroquinoline series

10.1007/s11178-008-3020-5

“…Initial autocomplexes Ia-Id were synthesized according to the procedures described by us previously [5]. Aniline, p-toluidine, 3,4-dimethylaniline, p-dimethylaminoaniline, 8-hydroxyquinoline, Ni(OAc) 2 , Co(OAc) 2 · 4H 2 O, Cu(OAc) 2 · H 2 O, and Zn(OAc) 2 · 2 H 2 O were commercial products.…”

“…While performing systematic studies on autocomplex-like compounds we synthesized a number of dinitroquinoline derivatives having donor fragments of different strengths and examined in detail intramolecular charge transfer in their molecules [5]. Among these, There are almost no published data on metal chelates derived from autocomplexes as ligands; exceptions are analogous derivatives based on compound Ia [6]; however, the latter was not considered to be an autocomplex.…”

“…Following the procedure proposed in [9] and taking into account our previous results [5], charge-transfer bands in the spectra of metal chelates II-V, as well as of initial ligands Ia-Id, were assigned mainly to intraligand transitions ( Table 1). The short-wave band corresponds to charge transfer from the NH-D donor fragment to the acceptor p-NO 2 group (para band); next follows (in the series of decreasing excitation energy) electron transition from the NH-D fragment to the o-NO 2 group (ortho band) and intramolecular contact (through space) charge transfer (ICT-I) between the NH-D fragment and o-NO 2 group which is forced out from the quinoline ring plane.…”

Synthesis and spectral-kinetic investigation of fulgimide-based photochromic autocomplexes of the dinitroquinoline series

“…Earlier, 6 we have reported the synthesis and investigation of the char acteristic features of the do nor acceptor interactions in numerous autocomplexes of this series containing donor moieties of different nature and strength. Based on the results of the detailed spectro scopic study, it was established that the charge transfer in these compounds can occur both via the direct polar conjugation through the bridging nitrogen atom and through space between the closely spaced fragments of the autocomplexes.…”