Structure and magnetic behavior of unpredictable EE-azide bridged tetranuclear Mn(II) complex with ONO-donor hydrazone ligand and its transformation to dinuclear Mn(III) complex

Synthesis, crystal structure and cytotoxicity assays of a copper(II) nitrate complex with a tridentate ONO acylhydrazone ligand. Spectroscopic and theoretical studies of the complex and its ligand

“…The H 2 L ligand crystallizes as E isomer in the tautomeric amido form (I) (Scheme 3), where the hydrazides fragment adopts the keto-amine arrangement [23]. The C8=N1, C9=O2 and the C9-N2 bond lengths are in close agreement with the formally double and single bond character [37] and also with the reported values for some hydrazones in the amido tautomeric form (I) [38][39][40][41]. The solid state structure of the copper compound, [Cu(HL)(OH 2 ) 2 ](NO 3 ), was determined by Xray diffraction methods.…”

Electrocatalytic water oxidation by a Ni(ii) salophen-type complex

“…The absorption spectra exhibit intense bands in the 258–337 nm region, which is attributed to the π → π* and n → π* intra-ligand transitions. 26 The intensity of n → π* transition decreases after complex formation which can be attributed to the coordination of the azomethine groups to the metal ion. For complex 1, the absorption bands at 385 nm and 483 nm can be assigned to the L → M charge transfers transitions (LMCT).…”

Metal‐Ion Tuning in Triple‐Stranded Helicate‐Based Metallosupramolecules

“…As expected, the c M T value of 3 at 300 Ki se stimated to be 4.27 emu Kmol À1 ,w hich is substantially higher than those of 1 (1.38 emu Kmol À1 )a nd 2 (2.63 emu Kmol À1 ). The calculated c M T values at 300 Ks uggest the existence of Ni II , [19] Co II , [12a] and Mn II [20] in 1, 2,a nd 3,r espectively.C urie-Weiss (C) and Weiss (q) constantse stimated from the corresponding fitting of 1/c versus T curveso f1, 2,a nd 3 (Figures S11-S13, Supporting Information) are summarized in Ta ble S4 (Supporting Information). The negative q values of these supramolecular helicates suggest an antiferromagnetic interaction between metal ions.…”