A new type of binuclear oximehydrazonate clathrochelates of iron(II): synthesis, spectra and structure

Triribbed-Functionalized Clathrochelate Iron(II) Dioximates as a New and Promising Tool To Obtain Polynucleating and Polynuclear Compounds with Improved Properties

“…Electrochemistry. Cyclic voltammograms of iron(II) clathrochelates are characterized by the existence of anodic waves, which are assigned to the oxidation of iron(II) to iron(III) ions. ,, Table lists the half-wave potentials ( E 1/2 ) attributed to this process, as well as the Tomeš criterion values, that have been determined as a wave slope (Δ E = E 3/4 − E 1/4 ) and might be used as a characteristic of reversibility and slow of electrochemical reactions (for one-electron reversible process, this value is equal to 56 mV). , The data listed indicate that most of the iron(II) clathrochelates obtained have undergone an irreversible oxidation since there are no waves upon backscanning, i.e., oxidation of initial iron(II) clathrochelates was accompanied by further decomposition of the oxidized complex and passivation of the working electrode. This behavior may account for the fact that the stability of iron(III) complexes is much lower than the stability of the initial iron(II) complexes.…”

“…The size of the cavity in dioximate clathrochelates is optimal for the iron(II) ion, and therefore all attempts to isolate iron-(III) clathrochelates by electrolysis at a controlled potential have not been successful. In some cases, 61 upon backscanning it was possible to observe the reduction of oxidation products within the cyclic voltammetry time scale. Among the complexes studied, only in the case of Fe((n-C 4 H 9 NH)2Gm) 2 (Cl2Gm)-(BC 6 H 5 ) 2 , Fe(CwGm) 2 (Cl2Gm)(B-n-C 4 H 9 ) 2 , and Fe((CH 3 S)-2Gm) 3 (BC 6 H 5 ) 2 complexes one can observe the reverse waves that are well reproduced in repeated cycling.…”

First trigonal-antiprismatic tris-dichloroglyoximate iron(ii) clathrochelate and its reactivity in nucleophilic substitution reactions

“…Therefore, we thought that it was desirable to synthesize a tin-capped reactive precursor to obtain trigonalantiprismatic ribbed-functionalized clathrochelates since the geometry of all previously obtained tin-capped clathrochelates approaches that of the trigonal antiprism (TAP). [7][8][9][10]…”

Synthesis of a Clathrochelate Complex with an Appended Pyridine and Its Coordination to a Cobaloxime Complex

“…Hendrickson, Gagne, Sinn, and co-workers have developed a clathrochelate system in which two metal ions are encapsulated within a single ligand cage derived from the condensation of 2 mol of 2,2‘,2‘ ‘-triaminotriethylamine and 3 mol of 2-hydroxy-5-methylisophthalaldehyde. A similar approach has been utilized by Voloshin and co-workers and Sahoo and co-workers to encapsulate two metal ions using a diacetylazine oxime ligand system which is closed off by either tin- or boron-containing capping groups. Drago and Elias and Chaudhuri and co-workers − have utilized tris(dioximato) complexes as bridging ligands which are “capped” by metal complexes to produce trinuclear species in which the central metal ion is encapsulated.…”