1373759-10-4Relevant articles and documents
N-(aryl)picolinamide complexes of rhodium: Synthesis, structure and, spectral and electrochemical properties
Bhattacharya, Ipsita,Dasgupta, Moutusi,Drew, Michael G. B.,Bhattacharya, Samaresh
, p. 205 - 216 (2012/11/07)
Reaction of a series of N-(aryl)picolinamide ligands (HL-R, where H denotes the acidic proton and R (R = OCH3, CH3, H, Cl and NO 2) is the para substituent in the aryl fragment) with RhCl 3·3H2O in refluxing ethanol in the presence of a base (NEt3) affords two groups of yellow complexes of type [Rh(HL-R)(L-R)Cl2] and [Rh(L-R)2(H2O)Cl]. In [Rh(HL-R)(L-R)Cl2], HL-R is coordinated as neutral N,O-donor and L-R as monoanionic N,N-donor, and the two chlorides are mutually trans. In [Rh(L-R)2(H2O)Cl] both the amide ligands are coordinated as monoanionic N,N-donor, and the chloro and aquo ligands are mutually cis. Structures of the [Rh(HL-OCH3)(L-OCH3)Cl2] and [Rh(L-Cl)2(H2O)Cl] complexes have been determined by X-ray crystallography. All the complexes show characteristic 1H NMR signals and intense LLCT transitions in the ultraviolet region. Cyclic voltammetry on the complexes shows an oxidation of the coordinated amide ligand within 0.78-1.80 V vs SCE and a reductive response within -0.20 to -0.75 V vs SCE. DFT calculations have been done to explain the electronic spectral and electrochemical properties.
