1058152-14-9Relevant academic research and scientific papers
Structural diversity in the first metal complexes of 2,5- dicarboxamidopyrroles and 2,5-dicarbothioamidopyrroles
Bates, Gareth W.,Gale, Philip A.,Light, Mark E.,Ogden, Mark I.,Warriner, Colin N.
, p. 4106 - 4112 (2008)
Metal complexes of 2,5-dicarboxamidopyrroles and 2,5- dicarbothioamidopyrroles have been structurally characterised for the first time, complementing the significant amount of work that has been reported for the analogous pyridine ligands. N,N′-Bis(3,5-dinitrophenyl)-3,4-diphenyl- 1H-pyrrole-2,5-dicarboxamide forms octahedral bis(tridentate) complexes with cobalt(iii) and nickel(ii), where the ligands are bound to the metal centres through deprotonated pyrrole and amide N atoms. N,N′-Dibutyl-3,4-diphenyl- 1H-pyrrole-2,5-dicarboxthioamide and N,N′-diphenyl-3,4-diphenyl-1H- pyrrole-2,5-dicarboxthioamide also form bis(tridentate) cobalt complexes but are only deprotonated at the pyrrole N atom, the remainder of the coordination sphere comprising the thioamide S atoms. The dibutyl derivative was isolated as a Co(ii) complex, whereas the diphenyl system deposited a Co(iii) complex. In contrast, N,N′-dibutyl-3,4-dichloro-1H-pyrrole-2,5-dicarboxamide was found to act as a bidentate ligand, in an octahedral cobalt(ii) complex comprising of two bidentate pyrrole ligands, and two aqua ligands. Synthesis of N,N-bis(pyridin-2-ylmethyl)-3,4-diphenyl-1H-pyrrole-2,5-carboxamide gave a pyrrole ligand with increased denticity. Reaction with cobalt(ii) chloride resulted in the isolation of a dinuclear helicate complex. The ligand was found to have undergone addition of a methoxy group to one of the linking methylene carbons, presumably as a result of the oxidative addition of solvent methanol.
