Two thioarsenates [Co(dien)2]3[As3S6]2 (1, dien = diethylenetriamine) and [Mn(teta)]2As2S5 (2, teta = triethylenetetramine) have been solvothermally synthesized and structurally characterized. 1 consists of isolated cyclic [As3S6]3− anions in a chair-conformation and two different isomeric [Co(dien)2] cations, while 2 consists of neutral [Mn(teta)]2As2S5 moieties built up from saddlelike As2S5 ...

The central Ni atom in the title compound, [Ni(C(29)H(29)N(3)O(4))]·2C(7)H(8), is coordinated in a distorted square-planar environment by three N atoms [Ni-N = 1.942 (3), 1.843 (3) and 1.853 (3) Å] and one O atom [1.868 (3) Å] of the tetradentate ligand. The conformation of the hy-droxy-butano-ate side chain is controlled by an inter-molecular hydrogen bond.

Mononuclear mixed-anions Mn complex of TPAMn(η-NO3)(η-ClO4), where TPA is tris(2-pyridylmethyl)amine, has been synthesized and characterized. The neutral TPAMn(η-NO3)(η-ClO4) was obtained from the reaction between Mn(NO3)2·4H2O and [H3TPA](ClO4)3 in MeOH. X-ray crystallographic structure of mononuclear TPAMn(η-NO3)(η-ClO4) complex showed a seven-coordinated geometry with a tripodal tetradentate...

Two new tetradentate ligands (L1 and L2) N,N'-bis {(o-aminophenylthio)bromo propyl} 1-phenyl butane 1,3-dilidene (L1), N, N'-bis (3bromo propyl (phenylthio) imino)1,1,1-trifluoro -3-(2-theonyl) acetone (L2) were prepared from the reaction of equimolar amount of (o-aminophenylthio) propylebromide and benzoylacetone or 2theonyltrifluoro acetone in (2:1) molar ratio. Reaction of the above ligands ...

A new tetradentate Schiff base, 3-[(Z)-2-piperazin-1-yl-ethylimino]-1, 3-dihydro indol-2-one was synthesized by the condensation of isatin(Indole-2,3dione) with 1-(2-aminoethyl)piperazine(AEP). Its complexes with Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Hg(II), UO2(VI) and Th(IV) have been synthesized and characterized by microanalysis, conductivity, UV-visible, FT-IR, 1H NMR, TGA and magnetic s...

A redox-active, tetradentate ligand, N,N'-bis-(3-dimethylamino-propyl)-4,5-dimethoxy-benzene-1,2-diamide ([N(2)N(2)(cat)](2-)), was developed, and the six-coordinate metal complexes [N(2)N(2)(cat)]TiCl(2) (3) and [N(2)N(2)(cat)]ZrCl(2) (4) were synthesized. The tetradentate ligand was determined to be fluxional in 3 and 4, enabled by reversible dissociation of the neutral amine groups of the [N...

Bacteria use siderophores to mediate the transport of essential Fe(III) into the cell. In Campylobacter jejuni the periplasmic binding protein CeuE, an integral part of the Fe(III) transport system, has adapted to bind tetradentate siderophores using a His and a Tyr side chain to complete the Fe(III) coordination. A series of tetradentate siderophore mimics was synthesized in which the length o...

In the context of our systematic investigations of pentaand hexacoordinate silicon compounds, which included dianionic tri(O,N,O1; O,N,N1) and tetradentate (O,N,N,O; O,N,N1,O1) chelators, we have now explored silicon coordination chemistry with a dianionic tetradentate (N,N1,N1,N) chelator. The ligand [o-phenylene-bis(pyrrole-2-carbaldimine), H2L] was obtained by condensation of o-phenylenediam...