Dinuclear Ni(II) and Cu(II) complexes with indolecarboxamide ligand: Synthesis, structure and properties

Manganese Complexes of Pyrrole‐ and ­Indolecarboxamide Ligands: Synthesis, Structure, Electrochemistry, and Applications in Oxidative and Lewis‐Acid‐­Assisted Catalysis

“…Further, the observed Mn-N amide bond lengths for complexes 3 and 5 are in good agreement with our earlier Ni II and Cu II complexes supported with similar ligands. [100,101] Furthermore, the M-N pyrrole and M-N indole distances are also comparable as noted before. [100,101] …”

“…[100,101] Furthermore, the M-N pyrrole and M-N indole distances are also comparable as noted before. [100,101] …”

“…[100,101] We have delineated a few ligand architectural parameters, subtly altered by inserting electronic substituents, to affect the structure-redox relationship of the metal ion. Herein, we have used a set of pyrrolecarboxamide and indolecarboxamide ligands containing electron-donating and electron-withdrawing substituents for the synthesis of a few Mn III complexes.…”

Mononuclear nickel and copper complexes with indolecarboxamide ligands: Synthesis, properties and electrochemistry

“…Such ligands have been shown to stabilize the nickel and copper ion in both +2 as well as +3 (transient) oxidation states in a rare square-planar geometry [23][24][25][26]. Recently, we have developed new amide-based ligands additionally supported by pyrrole or indole groups (H 4 L 1 and H 4 L 2 ; Scheme 1) to incorporate better donor sites to increase the electron density at the metal center [27,28]. The unique binding abilities of the potential tetradentate pyrrolecarboxamide ligand, H 4 L 1 and indolecarboxamide ligand, H 4 L 2 towards Ni(II) and Cu(II) ions resulted in interesting coordination chemistry.…”

“…doi:10.1016/j.ica.2011.02.056 coordination took place via N amide , N pyrrole and O amide atoms in complexes 3 and 4 with one of the amide group remaining protonated (Scheme 1). On the other hand, ligand H 4 L 2 only produced the dinuclear complexes, [M 2 (L 2 ) 2 ] 4À (5 and 6) where both metal centers were coordinated by two N amide and two N indole groups in a square-planar geometry [28]. The major difference between two sets of dinuclear complexes was the observation of symmetrical coordination of the ligands in 5 and 6 [28]; whereas an asymmetrical coordination resulted in 3 and 4 [27].…”