The C–N coupling reaction of pendant naphthyl group of palladium(II) complexes of 1-alkyl-2-(naphthyl-β-azo)imidazoles. Structural characterization, spectral and redox properties, and correlation with DFT computed data

Alcohol oxidation reactions catalyzed by ruthenium–carbonyl complexes of thioarylazoimidazoles

“…The Ru―N(azo) [Ru1―N4 is 2.165(2) Å in 2a , and 2.191(2) Å in 2b ] bond is longer than the Ru―N(imidazole) [Ru1―N1 is 2.112(2) Å in 2a , and 2.095(2) Å in 2b ], whereas in 3a these two bond distances are comparable: Ru1―N4, 2.051(5) Å; Ru1―N1, 2.070(5) Å. The differences in bond lengths are due to strong dπ(Ru) → π * (N―N) charge transfer . This is also supported from the ―N=H;N― bond length data – 1.288(3) Å ( 2a ), 1.297(4) Å ( 2b ) and 1.287(6) Å ( 3a ) – which tend to be longer than the comparable distance in the free azo ligand, 1.267(3) Å .…”

“…For more than a decade we have been engaged in the development of ruthenium chemistry of different arylazoheterocycles . The coordination chemistry of arylazoheterocycle with transition and non‐transition metals is popular because of their chemical, photophysical, photochemical, photochromic, catalytic, redox, biochemical, and magnetic properties . The π‐acidity of azoimine function (―N=H;N―C=H;N―) stabilizes the lower oxidation state of the metal ions in their coordination complexes.…”

Palladium(II)-iodo-{1-alkyl-2-(arylazo)imidazole} complexes: Synthesis, structure, dynamics of photochromism and DFT computation

“…Light irradiation may be associated with excitation to electronically high energy state which undergoes several molecular, electronic, vibrational and rotational changes followed by nonradiative deactivation. Mechanistic investigation by different spectroscopic routes [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]58,59] suggest the cleavage of M-N(azo) bond followed by bond rotation/flipping leading to isomerisation and formation of cis-isomer. In the complexes, [Pd(Raai-C n H 2n+1 )I 2 ] (7,8) we do not observe photoisomerisation even after prolong exposure to UV light irradiation; however, [Pd(Raai-C n H 2n+1 ) 2 I] 2 [Pd 2 I 6 ] (9-14) show photoisomerisation.…”

“…Palladium(II) complexes of Raai-C n H 2n+1 have been published in different dimension [28,[38][39][40] like -structure, redox, nucleophilic substitution reaction, metal assisted organic transformation such as C-N, C-O coupling, photochromism. In this work, we wish to report a newer type of isomer of palladium(II) complexes of Raai-C n H 2n+1 along with the structural characterization and photochromism.…”