Oxovanadium(V) schiff base complexes of trishydroxymethylaminomethane with salicylaldehyde and its derivatives: Synthesis, characterization and redox reactivity
摘要:
Five vanadium complexes possessing the VO3+ motif with NO4 coordination have been synthesized and characterized by H-1 and C-13 NMR, UV-Vis, FTIR and cyclic voltammetry. These complexes favour trigonal bipyramidal geometry. In DMF solution, complexes 1 and 5 have shown reversible redox behaviour in the presence of L-ascorbic acid or L-cysteine ethyl ester in air as monitored by electronic absorption and EPR studies.
Structure and Solution Equilibrium of N-Salicylidene-amino-sugars and Amino-alcohols.
作者:Shigeharu Inouye
DOI:10.1248/cpb.15.1540
日期:——
The structures and solution equilibria of twenty members of N-salicylidene-amino-sugars and -amino-alcohols were examined mainly in methanol, water and solid state. As the modeled compounds were examined simultaneously three members of N-salicylidene-alkylamines and eight members belonged to the o-methoxybenzylidene, 3-methoxysalicylidene, 3, 5-dibromosalicylidene and 2-hydroxynaphthylidene derivatives. From the comparative studies on the electronic, infrared, NMR spectra and equilibrium position, it was shown that the solution equilibrium consisted of the phenolimine and the ketoamine species, the latter being stabilized by the intra- and intermolecular hydrogen bonding involving the alcoholic hydroxyl groups and protic solvents. The acid-base equilibria of the two tautomers in methanol and the ketoamine-ion-pair equilibrium in water were discussed.
Syntheses of U3O8 nanoparticles form four different uranyl complexes: Their catalytic performance for various alcohol oxidations
作者:Ishani Majumder、Sourav Chatterjee、Roland C. Fischer、Swarup Kumar Neogi、Franz A. Mautner、Tanmay Chattopadhyay
DOI:10.1016/j.ica.2017.03.020
日期:2017.6
were treated with uranyl nitrate two mononuclear complexes, [(UO2)(L3)2(DMSO)2] (3) and [(UO2)(L4)2(DMSO)2] (4), are obtained. The complexes are then heated at 800 °C in open atmosphere to obtain the U3O8 nanomaterials as the final product. X-raydiffraction (XRD), scanningelectronmicroscopy (SEM), and transmission electronmicroscopy (TEM) were employed to characterize the so obtained the U3O8 nanoparticles
Imine or Enamine? Insights and Predictive Guidelines from the Electronic Effect of Substituents in H-Bonded Salicylimines
作者:R. Fernando Martínez、Esther Matamoros、Pedro Cintas、Juan C. Palacios
DOI:10.1021/acs.joc.0c00130
日期:2020.5.1
Imine and enamine bonds decorate the skeleton of numerous reagents, catalysts, and organic materials. However, it is difficult to isolate at will a single tautomer, as dynamic equilibria occur easily, even in the solid state, and are sensitive to electronic and steric effect, including π-conjugation and H-bonding. Here, using as model Schiff bases generated from salicylaldehydes and TRIS in a set of
Inner complex compounds of dioxomolybdenum(VI) with o-oxyazomethines, derivatives of substituted salicylaldehydes and tris(hydroxymethyl)aminomethane. crystal structures of two complexes [MoO(L)] · CH3OH; L = Z-substituted salicylalimines, Z = 3-NO2 and 3-OCH3
作者:V. L. Abramenko、A. V. Churakov、V. S. Sergienko、Yu. N. Mikhailov、M. D. Surazhskaya
DOI:10.1134/s1070328413080010
日期:2013.8
Ten new dioxomolybdenum(VI) compounds with o-oxyazomethines, derivatives of substitutedsalicylaldehydes (I–X) and tris(hydroxymethyl)aminomethane, are synthesized. The structures of two of them, [MoO2(L)] · CH3OH; L = Z-substituted salicylalimines, Z = 3-NO2 (IV) and 3-OCH3 (V), are determined by X-ray diffraction analysis. Compounds IV and V have similar structures and geometric parameters. The Mo
Single‐Ion Magnetic Behavior in Co
<sup>II</sup>
–Co
<sup>III</sup>
Mixed‐Valence Dinuclear and Pseudodinuclear Complexes
作者:Soumen Manna、Apurba Bhunia、Soumen Mistri、Julia Vallejo、Ennio Zangrando、Horst Puschmann、Joan Cano、Subal Chandra Manna
DOI:10.1002/ejic.201700046
日期:2017.5.18
Two Co(II)-Co(III) mixed-valance complexes of molecular formula [Co2(H2L)2(H2O)2][Co2(H2L)2(H2O)(m-phth)]∙8(H2O)} (1) and [Co4(H2L)4(H2O)2(ppda)]∙2(dmf)∙3.2(H2O)} (2) [H2L2-= 2-((2-hydroxy-3-methoxybenzylidene)amino)-2-(hydroxymethyl)propane-1,3-diolato; m-phth = 1,3-benzenedicarboxylate; ppda = 1,4-phenylenediacrylate; dmf = N,N-dimethylformamide] have been synthesized and characterized by single