Synthesis and structure of nickel and copper chelate complexes with coumarin azo ligand

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Specific stereochemical features of metallochelate complexes with tridentate <Emphasis Type="Italic">N,N,N</Emphasis>(<Emphasis Type="Italic">N,N</Emphasis>,O)-donating ligands

Earlier X-ray diffraction studies of a series of 12 adducts (I–XII) between metallochelate complexes [M = Co(II), Ni(II), and Cu(II)] with tridentate N,N,N(N,N,O)-donating Schiff bases (L) and monodentate or bidentate ligands (L′) revealed a similarity in the stereochemistry of these compounds. The coordination polyhedron of metal atoms in compounds I–XII is a tetragonal pyramid (bipyramid) with two vertices occupied competitively. The L ligand occupies three coordination sites in the base of the pyramid. The L′ ligand approaches the metal atom, as a rule, in a direction perpendicular to the basal plane. The fourth site in the base of the pyramid and the apical vertex are occupied competitively. Different patterns of occupation of these positions are observed: they include the donor atoms of both the L and L′ ligands.     

2-(2-Pyridyl)indandione-1,3 and its zinc(II) and nickel(II) complexes: Synthesis and physicochemical characterization

Inner complex compounds (ICCs) and molecular adducts based on 2-(2-pyridyl)indandione-1,3 have been synthesized for the first time. The structure of the ligand (the preferred tautomer) and the complexes has been studied using X-ray crystallography, 1H NMR spectroscopy, and IR spectroscopy.     

Tribologically active azomethine metal complexes

Russian Journal of General Chemistry - Oil-soluble bis(salicylideneiminates) were prepared chemically (from acetates of 3d-metals) and electrochemically (by anodic dissolution of complex forming...     

Electrochemical and chemical synthesis of new luminescent schiff base complexes

Bis-chelate complexes of zinc, cadmium, lead, and mercury with o-N-tosylbenzylidene imines containing the C₇H₁₅ and C₁₈H₃₇ substituents at the C=N group nitrogen atom were prepared by the methods of electrochemical and chemical syntheses. The structure of the azomethines and their complexes was established by the methods of heteronuclear ¹H, ¹³C NMR spectroscopy (multidimensional and multinuclear COSY, HETCOR and HETCOR_LONG techniques). The complexes, as demonstrated by the X-ray analysis for the zinc chelate, have strongly distorted octahedral structure formed by the four azomethine nitrogen atoms and two oxygen atoms of the tosyl fragments. The coordination compounds show fluorescence in the blue part of the spectrum in high quantum yields for the zinc chelates.     

An adeno-associated viral vector transduces the rat hypothalamus and amygdala more efficient than a lentiviral vector

Background  

This study compared the transduction efficiencies of an adeno-associated viral (AAV) vector, which was pseudotyped with an AAV1 capsid and encoded the green fluorescent protein (GFP), with a lentiviral (LV) vector, which was pseudotyped with a VSV-G envelop and encoded the discosoma red fluorescent protein (dsRed), to investigate which viral vector transduced the lateral hypothalamus or the amygdala more efficiently. The LV-dsRed and AAV1-GFP vector were mixed and injected into the lateral hypothalamus or into the amygdala of adult rats. The titers that were injected were 1 × 10⁸ or 1 × 10⁹ genomic copies of AAV1-GFP and 1 × 10⁵ transducing units of LV-dsRed.     

New magnetoactive copper complexes with Schiff’s bases

Tridentate azomethine ligands with N₂O and N₃ donor atoms and their copper complexes have been synthesized and characterized. Magnetochemical measurements in the temperature range of 5–300 K show that the change in the coordination environment induces the change in the sign of exchange coupling in the molecules of complexes.     

Direct electrochemical and chemical syntheses, structures, and properties of metal complexes of azo compounds with an additional azo group in the amine fragment

New complexes of Cu(II), Co(II), and Ni(II) with 1-phenyl-3-methyl-4-[(4-phenylazophenyl)hydrazono]-5H-pyrazol-5-one and 1-phenyl-3-methyl-4-[4-methyl-2-(4-methylphenylazophenyl)hydrazono]-5H-pyrazol-5-one are synthesized by the chemical and electrochemical methods and characterized by IR, ¹H NMR, and EXAFS spectroscopy and X-ray diffraction analysis. Depending on the complexing metal and position of the additional azo group, the latter is involved or not in coordination with the metal to form heterounit five- and six-membered metallocycles.