Unprecedented Copper(II) Complex with a Topoquinone-like Moiety as a Structural and Functional Mimic for Copper Amine Oxidase: Role of Copper(II) in the Genesis and Amine Oxidase Activity
Copper amineoxidase (CAO), consisting of the topoquinone (TPQ) cofactor, catalyzes the oxidation of primary amines to aldehyde. We have successfully addressed this issue through isolation of a copper complex which mimics the active-site structure as well as the function of CAO. This inimitable complex, consisting of two TPQ-like side-arms, formed by ambient aerial oxidation of a precursor Schiff base
Synthesis, Characterization and Electrochemical Behavior of CoII, NiII and CdII Complexes with N2O2 Donor Ligands Derived from 4,4′-Diaminobiphenyl and 2-Hydroxybenzaldehyde or 2,4-Dihydroxybenzaldehyde
作者:Lakhdar Sibous、Embarek Bentouhami、Amor Maïza、Gilles M. Bouet、Mustayeen Ahmed Khan
DOI:10.1007/s10953-010-9512-2
日期:2010.4
The condensation of 2-hydroxybenzaldehyde or 2,4-dihydroxybenzaldehyde with 4,4′-diaminobiphenyl in absolute EtOH in a molar ratio 2:1 gave, respectively, the Schiff base ligands H2L1 or H2L2. The bases served as tetradentate ligands to coordinate CoII, NiII and CdII chlorides, leading to complexes where the metal:ligand ratio is 2:1. All of the compounds were characterized by elemental analysis, infrared, electronic and mass spectroscopy, 1H-n.m.r. and d.s.c. The cyclic voltammograms of the ligands and their complexes in DMF are discussed.
Ruthenium(II)/(III) bipyridine heterochelates incorporating phenolato imine functionalities. Synthesis, crystal structure, spectroscopic and electron-transfer properties and solution reactivities †
作者:Soma Chakraborty、Mrinalini G. Walawalkar、Goutam Kumar Lahiri
DOI:10.1039/b001663m
日期:——
II) and ruthenium(IV)–ruthenium(III) oxidations in the ranges 0.52–0.77 and 1.71–1.97 V versus SCE respectively. For 1a and 1b, one ligand centred oxidation near 2 V and for all the complexes two bipyridine based reductions have been detected in the ranges −1.51 to −1.56 V and −1.72 to −1.79 V versus SCE. Coulometric oxidation of 1 initially generates the unstable trivalent one-electron paramagnetic
[Ru(bpy)2(L')] ClO 4 [py = 2,2'-联吡啶; L'= - OC 6 H 3(R)C(R')NH; R = R'= H 1a ; R = H,R'= CH 3 1b;R = NO 2,R'= H 1c ]是通过裂解双核的N–N和NC–(脂族和芳族)键合成的亚胺功能。1a的单晶结构确定已验证了1的形成。该复合物在可见光区域表现出很强的MLCT跃迁,在紫外光区域表现出配体内的跃迁,并且在700 nm附近表现出中等强度的发射。量子产率(φ发光处理的)在77 K(乙醇–甲醇,4:1玻璃)在2.2×10 -2 –6.5×10 -3范围内变化,具体取决于1中的L' 。该配合物显示钌(III) -钌(II)和钌(IV) -钌(III)氧化的范围0.52-0.77和1.71-1.97 V相对于 分会分别。对于1a和1b,一个配体 居中 氧化作用 接近2 V,对于所有配合物,两个 联吡啶基于减少已经在范围中检测到-1
Organocatalyzed and mechanochemical solvent-free synthesis of novel and functionalized bis-biphenyl substituted thiazolidinones as potent tyrosinase inhibitors: SAR and molecular modeling studies
Eluding the involvement of solvents in organic synthesis and introducing environment friendly procedures can control environmental problems. A facile and an efficient solvent free mechanochemical method (grinding) is achieved to synthesize novel bis-biphenyl substituted thiazolidinones using non-toxic and cheap N-acetyl glycine (NAG). Organocatalytic condensation of a series of Schiff's bases bearing