1624-45-9Relevant academic research and scientific papers
C - H...π, π-π and C - H...Cl interactions in chloro-substituted Schiff bases and 4-chloro-N-[4-(dimethylamino)benzylidene]aniline
You, Xiu-Li,Lu, Cheng-Rong,Zhang, Yong,Zhang, De-Chun
, p. o693-o695 (2004)
The molecular packing in chloro-substituted Schiff bases and 4-chloro-N-[4-(dimethylamino)benzyliden]aniline, was analyzed along with C-H...π, π-π and C-H...Cl interactions. It was observed that when the molecular dipole is small, π-π interactions favor parallel mode of packing. The molecules interact through C-H...π and π-π interactions, which form a 'dimer' and double chains along [001]. The results show that double chains are extended along [101] through C-H...Cl hydrogen bonds, which forms double layers in (010).
Synthesis of some Schiff base complexes of nickel(II) and copper(II) derived from p-dimethylaminobenzaldehyde
Tiwari, Vivek,Singhai, Rashmi,Mishra
, p. 147 - 149 (2007/10/03)
Complexes of NlII and CuII with Schiff bases 4-dimethylaminobenzylidene-4-chloroaniline (DABCA)/4-dimethylaminobenzylidene-4-bromoaniline (DABBA)/4-dimethylaminobenzylidene-3-nitroaniline (DABNA) of general formula ML(H2O)2Cl2.2H2O and MLCl 2(H2O)2.2H2O have een synthesized. Coordination of azomethine nitrogen in the Schiff base to the metal has been proposed. Ligand field parameters of some of the complexes have been calculated.
Mechanism of Thermal Z/E Isomerization of Substituted N-Benzylideneanilines. Nature of the Activated Complex with an sp-Hybridized Nitrogen Atom
Asano, Tsutomu,Furuta, Hiroyuki,Hofmann, Hans-Joerg,Cimiraglia, Renzo,Tsuno, Yuho,Fujio, Mizue
, p. 4418 - 4423 (2007/10/02)
In order to study the mechanism of thermal geometrical isomerization involving a sp2-hybridized nitrogen atom, kinetic effects of substituent, solvent, and pressure were studied in substituted N-benzylideneanilines.The effect of the substituent on the aniline moiety was almost independent of the electronic nature of the benzylidene group, and the results could be described satisfactorily by log (k/k0) = ρ0 + r+(?+ - ?0) + r-(?- - ?0)>, except for the 4-(dimethylamino) group.The r- values were more than twice as large as r0, suggesting strongly that the aniline ring is in conjugation not with the carbon-nitrogen ? bond but with the nitrogen lone pair in the transition state.The lower activation enthalpies and fairly large negative activation entropies observed in N-(4-X-benzylidene)-4-nitroanilines also support this view.When a dimethylamino group exists in the 4-position of the aniline ring, the rate constants observed were larger than that expected from the above equation.This deviation suggests the existence of a reaction route where the two phenyl groups become coplanar in the transition state.Ab initio calculations on selected N-phenylformaldimines and N- benzylideneanilines were performed to characterize the actual relation between both reaction possibilities as alternative and parallel routes, respectively.On the basis of the experimental data, the rate constants for the two inversion isomerizations were estimated by assuming parallel reactions for three cases.
