Diazoketiminato complexes of Au(III): syntheses, characterisation and structure

Crystal structure of 2-[2-(pyridin-3-yl)diazen-1-yl]aniline

The crystal structure of the title compound, C11H10N4, comprises mol-ecules in a trans conformation for which all the atoms are located in general positions. The six-membered rings are coplanar and this arrangement might be stabilized by intra-molecular N-H⋯N hydrogen bonding. In the crystal, the mol-ecules are linked into helical chains parallel to the b axis via N-H⋯N hydrogen bonding. The mol-ecular packing shows a herringbone-like pattern along the a axis. Comparison of the X-ray powder diffraction with that calculated from single crystal data proves that a pure crystalline phase was obtained and UV-Vis measurements reveal that only the trans isomer is present.

Synthesis, Characterisation and Properties of Diazoketiminato-Chelate Complexes of Os(II)

Reactions of 2-(arylazo)aniline, L-NH2 [L-NH2 = p-RC6H4N=NC6H4NH2; where R=H for L1-NH2, CH3 for L2-NH2 and Cl for L3-NH2] with [Os(H)Br(CO)(PPh3)3] gave the complexes [OsBr(L-NH)(CO)(PPh3)2] for which cyclic volatammograms exhibited one quasi-reversible oxidative response within the range 0.54–0.6 V vs SCE. The X-ray crystal structure of [OsBr(L1-NH)(CO)(PPh3)2] has been determined and its electronic structure was evaluated on the basis of single point DFT calculations using its crystallographic coordinates.

Reactions of 2-(Arylazo) Aniline with RhCl3: Synthesis and Structure of New Cyclometalated Complexes of Rh(III) and Recognition of RhCl3 Assisted Azo (NN) Cleavage

The reactions of 2-(arylazo) anilines, HL (1) [where HL is 2-(ArN=N)C6H4NH2; Ar is C6H5 (for HL1, 1a) and p-MeC6H4 (for HL2, 1b); H of HL represents the proton of Ar which gets dissociated upon orthometalation] with RhCl3 in methanol afforded new orthometalated complexes of composition (L)(HL)Rh(III)Cl2 (2) and (L)(ArNH2)Rh(III)Cl2 (3). The anionic L- binds the metal in tridentate (C, N, N) manner in both the complexes, while HL and ArNH2 bind the metal of 2 and 3 in monodentate fashion through the amino nitrogen. The ArNH2 of 3 was formed in situ due to cleavage of azo (-N=N-) function of monodentate HL of 2. The scission of N=N has been authenticated.