First report of manganese(IV) and manganese(III) complexes with hydroxamic acids: Synthesis, characterization and electrochemistry of benzo- and anthranilo-hydroximato manganate (IV and III)

Synthesis, structures and speciation studies of ruthenium(iii) hydroxamate/hydroximato complexes. Crystal and molecular structure of hydrated [Ru(H2edta)(2-methoxyphenylhydroxamate)], the first structurally characterised ruthenium(iii)–hydroxamate complex

“…This gives the purple-coloured hydroximato complex [Ru(edta)(PhaH Ϫ1 )] 3Ϫ , the major species in solution at and [Mn(LH Ϫ1 ) 2 ] Ϫ , respectively, were isolated. 30 The scarcity of information on such systems is at least partly due to the general insolubility of metal-hydroxamate complexes. This problem was not encountered in the present case and relevant equilibria for a series of hydroxamate complexes are reported.…”

Electronic versus steric control in manganese-hydroxamate chemistry: synthesis and characterization of Mn(II) and Mn(III)-hydroxamate complexes and catalytic epoxidation of olefins using the Mn(III) complexes as catalyst and H2O2 as terminal oxidant

“…From the vapor pressure osmometric data (see Section 2) in acetonitrile the molecular weights of 2 and 3, were assessed, which are nicely comparable to the calculated value. The ease of oxidation of Mn(II) aerially to Mn(III) or even to Mn(IV) is well documented [6,19]. In this connection two reports from Refs.…”

“…Based on this as well as other medicinal uses as aspirin analog, nitric oxide donor, inhibitors of prostaglandin H synthase, peroxidases and ureases as well as the fact that a hydroxamic acid (trade name Marimastat) is going to appear as anticancer drug [5] very soon, a detailed study of Mn-hydroxamic acid reaction is more than warranted. Strikingly, manganese-hydroxamate chemistry is still unknown and a few years ago we made the inaugural report [6] of manganese hydroximate chemistry where capability of primary hydroxamic acid to form stable hydroximate-complexes of Mn(III) and Mn(IV) from Mn(II) starting material in aqueousaerobic medium, as against formation of only polymeric Mn(II) hydroxamate complexes with secondary hydroxamic acids, under the same experimental conditions, was attributed mainly to electronic reasons [6].…”

Monohydroxamic acids and bridging dihydroxamic acids as chelators to ruthenium(iii) and as nitric oxide donors: syntheses, speciation studies and nitric oxide releasing investigation

“…29 Benzo-and anthranilo-hydroximato manganate (IV and III respectively) complexes have also been reported. 30 A more recent report by Hambley and co-workers details an elegant study whereby, upon manipulation of pH, they were successful in isolating either the hydroxamato or hydroximato Co III The ternary Ru III -edta-dihydroxamato systems…”