Syntheses, crystal structures, and electrochemical characterizations of two octahedral iron(III) complexes with Schiff base of pyridoxal and aminoguanidine

New Type of Neutral Binuclear Spin‐Crossover Complex of Iron(III) with Twist of Two Disulfide Bridges as a Product of Electrochemical Oxidation of [FeIII(5Cl‐thsa)2]− Anions

“…Such oxidation process which provides the formation of disulfide bonds has been observed previously using an electrochemical methodology for the synthesis of metal complexes with heterocyclic thione‐type ligands [18] . These processes highlight the versatility of thiosemicarbazone chains in the creation of new organic systems, what arose a keen interest in polynuclear SCO helicate compounds based on thsa‐type ligands [18–25] . Thus, in an electrochemical study of some Fe III complexes with thsa‐type ligands ( L ), Leovac et al.…”

“…Thus, the application of [Fe(5Cl‐thsa) 2 ] − anion in hybrid systems due to the peculiar magnetic properties such as multi‐step and high cooperative SCO effect may be interesting for creation of new materials for spintronics. When designing strongly cooperative complexes, the key point is to create a high efficiency of intermolecular contacts, and the simplest systems are polynuclear helicates and binuclear spin‐crossover complexes, the synthesis and study of which are the subject of researchers′ work [18–28] . However, the question of how to design strongly cooperative complexes has still not been answered satisfactorily.…”

“…When designing strongly cooperative complexes, the key point is to create a high efficiency of intermolecular contacts, and the simplest systems are polynuclear helicates and binuclear spin-crossover complexes, the synthesis and study of which are the subject of researchers' work. [18][19][20][21][22][23][24][25][26][27][28] However, the question of how to design strongly cooperative complexes has still not been answered satisfactorily.…”

“…[18] These processes highlight the versatility of thiosemicarbazone chains in the creation of new organic systems, what arose a keen interest in polynuclear SCO helicate compounds based on thsa-type ligands. [18][19][20][21][22][23][24][25] Thus, in an electrochemical study of some Fe III complexes with thsatype ligands (L), Leovac et al suggested the existence of dimeric neutral complexes [Fe III (HL) 2 ][Fe III (L) 2 ] in a DMF solution. The composition and structure of the Fe III complexes have not been elucidated yet.…”

Solution Equilibrium Studies on Salicylidene Aminoguanidine Schiff Base Metal Complexes: Impact of the Hybridization with L-Proline on Stability, Redox Activity and Cytotoxicity

“…The ligand has two possible coordination sites: the aminoguanidine and the proline part. In literature, there are two crystal structures of Fe(III) with pyridoxal-aminoguanidine (Reference code CELHIM and CELHOS) [ 35 ] where the guanidine coordination is realized. Surprisingly, in our case the proline part of the ligands coordinated with the metal ion by the phenolic oxygen, pyrrolidine nitrogen and one carboxylate oxygen.…”