Structure, absolute configuration and electrochemical properties of Tris(N-methylformothiohydroxamato)iron(III), an antibacterial metal chelate and potential iron siderochrome

1978 ◽  
Vol 31 (5) ◽  
pp. 983 ◽  
Author(s):  
KS Murray ◽  
PJ Newman ◽  
BM Gatehouse ◽  
D Taylor
Keyword(s):  
Absolute Configuration ◽  
Title Compound ◽  
Metal Chelate ◽  
Octahedral Complex ◽  
Reduction Wave ◽  
Irreversible Reduction ◽  
Distorted Octahedral ◽  
Voltammetric Studies ◽  
Dispersion Technique ◽  
Cyclic Voltammetric Studies

The title compound, which previously had been isolated from bacteria and shown to possess anti-bacterial activity, has been chemically synthesized. The molecular structure has a cis (facial) arrangement of the asymmetric {S,O} bidentate ligands (Fe-S 2.441(1) Ǻ, Fe-O 2.010(1) Ǻ) as required by the crystallographic C3 molecular symmetry. (Crystal data: C6H12N3O3S3Fe, rhombohedral, space group R3, a 7.094(2)Ǻ, α 102.00(1)°, Z 1.) The complex was spontaneously resolved into enantiomers on crystallization and the absolute configuration in the crystal studied was established as Λ by the anomalous dispersion technique. Magnetic, e.s.r. and Mossbauer studies are compatible with a distorted octahedral complex of high-spin iron(III). Cyclic voltammetric studies in acetone of the title compound and some related iron(III) thiohydroxamates were carried out. A reversible FeIII/FeII reduction wave was observed for the N-methylformothiohydroxamato chelate, in contrast to the irreversible reduction of tris(benzohydroxamato)iron(III), a related complex containing an {O,O} chelate. The tris(benzothiohydroxamato) chelate, Fe(PhC(S)NHO)3, which possesses a non-alkylated nitrogen, also showed an irreversible reduction wave.

scholarly journals DC-polarography and cyclic voltammetric studies of some mono and bis azo compounds derived from aromatic primary amines and 2,3-dihydroxynaphthalene in aqueous solutions

2010 ◽  
Vol 7 (2) ◽  
pp. 339-346
Author(s):  
R. El-Sayed ◽  
AbdAllah A. Mohamed ◽  
E. M. Mabrouk
Keyword(s):  
Reduction Process ◽  
Azo Compounds ◽  
Primary Amines ◽  
Alkaline Solutions ◽  
Irreversible Reduction ◽  
Dc Polarography ◽  
Controlled Potential ◽  
Voltammetric Studies ◽  
Amine Compounds ◽  
Cyclic Voltammetric Studies

The DC and CV behavior of some mono and bis azo compounds based on aromatic primary amines and 2,3-dihydroxynaphthalein was investigated in Britton-Robinson buffer series. The obtained results indicated that these compounds undergo an irreversible reduction leading to cleavage of the N=N center with the formation of amine compounds. However, for the derivative m-CH3 on the aniline ring in alkaline solutions, the reduction stops at the stage for saturation of the N=N center. The E1/2 and Ep shifted to more negative potentials with rise of pH and the values of il are not much influenced except for the m-CH3 derivative. The total number of electrons involved in the reduction process was determined by controlled potential coulomety and calculated from Ilkovic equation. The effect of substituents on the electrode pathway was discussed. Based on the data obtained the electroreduction mechanism was suggested and discussed.

scholarly journals Serendipitous preparation offac-(acetonitrile-κN)trichlorido[(1,2,5,6-η)-cycloocta-1,5-diene]iridium(III)

2015 ◽  
Vol 71 (4) ◽  
pp. 371-373
Author(s):  
David M. Morris ◽  
Joseph S. Merola
Keyword(s):  
Title Compound ◽  
Octahedral Complex ◽  
Chloride Ligands

A reaction between [(COD)IrCl]2(COD is cycloocta-1,5-diene), HCl and indene failed to provide the hoped for chloridoindenyliridium dimer, but instead produced the title compound, [IrCl3(CH3CN)(C8H12)], which is an octahedral complex of iridium(III) with a chelating cycloocta-1,5-diene ligand, three chloride ligands in afacarrangement, and one acetonitrile ligand. Attempts to devise a rational synthesis for the title compound were unsuccessful.

(3R,4R)-(–)-3-Hydroxymethyl-4-phenyl-2-o-toluoyl-1,2,3,4-tetrahydroisoquinoline

2006 ◽  
Vol 62 (5) ◽  
pp. o1774-o1776 ◽  
Author(s):  
Andrzej Gzella ◽  
Maria Chrzanowska ◽  
Agnieszka Dreas ◽  
Michał S. Kaczmarek ◽  
Zenon Woźniak
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Phenyl Ring ◽  
Heterocyclic Ring ◽  
Hydroxymethyl Group ◽  
Envelope Conformation ◽  
Compound C ◽  
The Absolute

The absolute configuration of the title compound, C24H23NO2, has been confirmed as 3R,4R. The hydroxymethyl group and phenyl ring at the asymmetric C atoms exhibit α and β orientations, respectively, and the non-planar heterocyclic ring of the tetrahydroisoquinoline system adopts an envelope conformation. The crystal structure is stabilized through hydrogen bonds.

(4S,1′R)-Diethyl 6-methyl-2-[(1′-phenylethylimino)methyl]-4-(2-thienyl)-1,4-dihydropyridine-3,5-dicarboxylate

2006 ◽  
Vol 62 (7) ◽  
pp. o2759-o2761
Author(s):  
Viktor Vrábel ◽  
Pavol Skubák ◽  
Štefan Marchalín ◽  
Vratislav Langer ◽  
Barbora Baumlová
Keyword(s):  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Thiophene Ring ◽  
Boat Conformation ◽  
Compound C ◽  
The Absolute

The absolute configuration of the title compound, C25H28N2O4S, has been determined. The molecules are interconnected by weak C—H...O hydrogen bonds. The 1,4-dihydropyridine (1,4-DHP) ring adopts the usual shallow boat conformation. The thiophene ring is nearly planar.

scholarly journals Diaquabis(2,2′-bi-1H-imidazole)manganese(II) benzene-1,4-dicarboxylate

2012 ◽  
Vol 68 (6) ◽  
pp. m829-m829
Author(s):  
Lining Yang ◽  
Yanxiang Zhi ◽  
Jiahui Hei ◽  
Yanqing Miao
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Crystal Packing ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
Water Molecules ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Centroid Distance ◽  
Distorted Octahedral

The asymmetric unit of the title compound, [Mn(C6H6N4)2(H2O)2](C8H4O4), contains one-half each of the centrosymmetric cation and anion. The MnII atom is coordinated by four N atoms [Mn—N = 2.2168 (14) and 2.2407 (14) Å] from two 2,2′-biimidazole ligands and two water molecules [Mn—O = 2.2521 (14) Å] in a distorted octahedral geometry. Intermolecular N—H...O and O—H...O hydrogen bonds consolidate the crystal packing, which also exhibits π–π interactions between five-membered rings, with a centroid–centroid distance of 3.409 (2) Å.

scholarly journals Tris(ethylenediamine-κ2N,N′)cadmium hexafluoridogermanate

2012 ◽  
Vol 68 (4) ◽  
pp. m396-m397
Author(s):  
Guo-Ming Wang ◽  
Zeng-Xin Li ◽  
Pei Wang
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Rotation Axis ◽  
Three Dimensional ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
Supramolecular Network ◽  
Distorted Octahedral ◽  
Axis Passing

In the title compound, [Cd(C2H8N2)3](GeF6), the CdIIatom, lying on a 32 symmetry site, is coordinated by six N atoms from three ethylenediamine (en) ligands in a distorted octahedral geometry. The Ge atom also lies on a 32 symmetry site and is coordinated by six F atoms. The en ligand has a twofold rotation axis passing through the mid-point of the C—C bond. The F atom is disordered over two sites with equal occupancy factors. In the crystal, the [Cd(en)3]2+cations and [GeF6]2−anions are connected through N—H...F hydrogen bonds, forming a three-dimensional supramolecular network.

scholarly journals Bis(1-dodecyl-4-aza-1-azoniabicyclo[2.2.2]octane)tetraisothiocyanatocobalt(II)

IUCrData ◽  
2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Niels Ole Giltzau ◽  
Martin Köckerling
Keyword(s):  
Hydrogen Bonding ◽  
Equatorial Plane ◽  
Title Compound ◽  
Unit Cell ◽  
Octahedral Coordination ◽  
Coordination Environment ◽  
Distorted Octahedral Coordination ◽  
Distorted Octahedral ◽  
Triclinic Unit Cell ◽  
Distorted Octahedral Coordination Environment

The title compound, [Co(C18H37N2)2(NCS)4], consists of a cobalt(II) ion positioned on the origin of the triclinic unit cell. It is coordinated by the N atoms of two trans-oriented 1-dodecyl-4-aza-1-azoniabicyclo[2.2.2]octane (DABCO+) cations, which carry n-dodecyl chains at the non-coordinating N atoms. The distorted octahedral coordination environment of the CoII ion is completed through four N atoms of isothiocyanate ions, which are arranged within the equatorial plane. Non-classical hydrogen bonding of the types C—H...N and C—H...S between the filamentous molecules lead to the formation of layers parallel to (001).

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